Botany Primer for Gardeners<br />Linda R McMahan, PhD<br />Botanist & Extension Horticulturist<br />Oregon State Universit...
What We Will Cover<br />Plant Diversity <br />Algae, fungi and lichens<br />Spore producing plants – mosses, liverworts, f...
Plant Diversity<br />From ancient time when we began studying the world around us, we tried to understand our surroundings...
Plant Diversity<br />The classification of various kinds of plants is based on reproduction  <br />Spore producing plants ...
Plant Diversity<br />Goal:  Learning the patterns of diversity will help us learn to garden with nature rather than workin...
I. Organisms that reproduce through spores<br />Algae and fungi<br />Lichens<br />Slime Molds <br />Mosses<br />Liverworts...
Algae and Fungi<br />Some algae are considered to be plants and some are not--fungi now reside in a separate Kingdom but m...
Algae<br />Include many different kinds, but the most familiar are those of streams, ponds and at the ocean shore washed u...
Are Algae A Problem?<br />Algae by themselves are not a problem-it is not a parasite for example<br />Because growth of al...
Fungi<br />Many kinds of fungi occur on earth<br />When you say “fungus”, most people will answer “mushroom” but fungi are...
Fungi<br />Some mushrooms and other fungi are also toxic, but this is rarely a concern. Unless you know they are a problem...
Mushrooms in the Lawn<br />Gardeners who are worried about safety can seek positive identification and information, or rak...
Positive Benefits of Fungi<br />Fungi are one of earth’s major decomposers, helping to return organic matter to enrich our...
How Fungi Reproduce<br />Fungi reproduce through spores that become airborne<br />The visible part of a fungus is usually ...
Fungi<br />Mushrooms and other spore producing bodies are often the most visible part of the fungus<br />Mushrooms growing...
Not all spore producing bodies are “mushrooms”<br />Cup-like spore producing bodies in cracks in a brick walkway<br />Cup ...
Mycorrhizae<br />Most soil fungi form relationships with most plants in a mutually beneficial relationship called mycorrhi...
Mycorrhizae<br />Mycorrhizae are found in the roots of the plants where tissues of the two organisms intertwine<br />Funga...
A new way to look at forests and gardens<br />Part of the magic of this relationship is that individual plants may form as...
Slime Molds<br />Slime molds are not technically fungi nor plants<br />They grow in moist, usually warm conditions such as...
Slime molds in the garden<br />Slime molds have two phases. A moving mass first grows on decaying leaves, compost, or stum...
Lichens, a “special” group<br />Lichens are usually small and are not individual organisms<br />Instead, they are a combin...
Lichens<br />Most are gray or greenish<br />The visible part is the fungus, the algae are inside<br />Lichens are another ...
Lichens<br />Both algal and fungal partners benefit from this relationship<br />Algae gain a moist environment and the fun...
Lichens<br />Some gardeners are worried about lichen, but they are not a disease and cause no harm to the plant<br />Vario...
Mosses<br />Are common in the moist habitats<br />Reproduce by spores<br />Are of short stature because they lack an organ...
Mosses<br />Mosses are a healthy part of gardens and ecosystems<br />They often grow in lawns when the lawns themselves ar...
Liverworts and other forest floor plants<br />Liverworts and their relatives have been on earth since ancient times<br />T...
Liverworts<br />One species of liverwort has become adapted to live in nursery pots and is considered to be a pest by nurs...
Horsetails<br />Perhaps no plant has caused such concern to tidy gardeners as the common horsetail.  Rapidly spreading und...
Horsetails<br />Here is the familiar horsetail form<br />Horsetails of many kinds are native around the world<br />Control...
Ferns<br />Ferns also reproduce by spores <br />Ferns are popular garden plants and some forms thrive in most, shady garde...
Ferns<br />Typically the fern leaves, called fronds, uncurl as they open such as shown here<br />Bracken fern in spring<br />
Ferns<br />Spores are produced on the backs of the fronds or sometimes on separate modified leaves that only bear spores<b...
2. Plants that produce seeds<br />We will cover three kinds of seed bearing plants<br />Ginkgo<br />Conifers<br />Flowerin...
Ginkgo<br />Very ancient plants once though to be extinct<br />Related to conifers but have different reproductive structu...
Ginkgo biloba<br />Good landscape tree, drought and pollution tolerant<br />Distinctive leaf form often used in artistic w...
Conifers<br />Bear their seeds in cones<br />Conifers also have needles or scales<br />When seeds mature, cones usually op...
Conifers<br />Large group with many trees and shrubs<br />Popular in gardens, particallybecause most are evergreen<br />Pi...
Conifers<br />Cones are made up of overlaping scales<br />In new female cones, the ovules are inside the cone but the scal...
Conifers<br />Pollination time differs for each species<br />Pollen is produced in tiny cones (dark orange in this tree) w...
Flowering Plants<br />A very large group, the latest to appear on earth<br />Developing seeds are protected within a solid...
Flowering Plants<br />Include trees, shrubs, herbaceous plants, vines<br />Are very popular garden plants<br />Are highly ...
Pollination<br />Is the process of transferring pollen from one flower to another<br />Typically, can be by wind, insects,...
Pollination<br />Plants pollinated by insects are typically sweet smelling, colorful, and have places for insects to land<...
Pollination<br />Plants attracting butterflies also provide nectar—they often have a large flat surface to support the but...
Pollination<br />Many other garden plants are pollinated by hummingbirds<br />These flowers tend to be red or orange<br />...
Pollination<br />Plants pollinated by wind have less colorful flowers<br />Pollen is usually produced in catkins which con...
Fruits<br />When seeds mature, they are carried in fruits<br />Fruits can be fleshy or dry and take many forms<br />Berrie...
More Fruits<br />Mimulus guttatus, yellow monkey flower has dry fruits called pods<br />Big leaf maple, Acer macrophyllum ...
3. Plant Anatomy<br />Seed bearing plants all share the same basic structures<br />Typical parts include leaves, stems, ro...
Overall Plant Structure<br />This is sweet cicely, a plant native to Oregon<br />Botanists know this because it has white ...
Stems<br />Provide overall support<br />Create the “architecture” characteristic of each plant<br />Have internal vascular...
Stem Structure<br />This stem is woody, with wood cells for support<br />The main stem has a side branch at a place called...
Stem Structure<br />Here is another winter twig with no leaves<br />Plants that loose leaves during dormancy are called de...
Stem Structure<br />Each year, when the buds break or start to grow, the bud scales fall off, leaving bud scale scars<br /...
Plant Growth Structure<br />Buds are of many types including flower buds, branch buds, and mixed buds<br />Lateral branch ...
Plant Growth Structure<br />Note that the small branch is growing from a node area, just above the leaf<br />The buds that...
Kinds of Branching<br />The kind of branching on the last slide is called alternate <br />Here, the type of branching is c...
Woody Stems<br />Woody plants grow differently than herbaceous plants<br />Herbaceous plants are most commonly annuals, bi...
Woody Stems<br />Here is a cross-section through a tree, showing typical woody structure<br />On the outside is bark<br />...
Woody Plants<br />The inner part is xylem tissue that transports water and is considered to be the “woody part”<br />This ...
Woody Plants<br />One growth ring is formed each year<br />At the beginning of each growth season, cells are large<br />At...
Woody Plants<br />Nutrient and water transport happen on the outer edges of the tree or shrub<br />For this reason, it is ...
Leaves<br />Leaves are usually the site of the process of photosynthesis, using the sun’s energy to create sugars and othe...
Leaf Characteristics – Vein Patterns<br />The vascular system of plants moves through leaves in 3 kinds of patterns<br />T...
Parallel Vein Patterns<br />Parallel vein patterns <br />Occur in a group of plants called Monocotyledons or “Monocots” fo...
More Parallel Vein Patterns<br />Mianthemum dilitatum, false lily of the valley<br />Disporum species<br />
Pinnately Veined<br />Vein patters are also  sometimes called venation<br />Pinnatelyveined leaves have veins in a feather...
More Pinnate Vein Patterns<br />Leaf skeleton of a magnolia<br />
Palmately Veined Leaves<br />Palmately veined leaves are the third pattern<br />Main veins arise from the point of attachm...
More PalmatelyVeined Leaves<br />Fringecup, Tellima gandiflora<br />A water lily<br />
Petioles<br />Most leaves have a stem like structure connecting the leaf blade to the stem<br />These are called petioles<...
Leaf Edges<br />Patterns of leaf edges also help us distinguish plants<br />This is one of many edge patterns or margins<b...
Simple Leaves<br />Leaves with just one undivided leaf blade are called simple leaves<br />Several simple leaves on a bran...
Simple Leaves<br />Remember, each leaf has a bud associated with it to facilitate branching<br />Several leaves and the as...
Compound Leaves<br />Compound leaves have more than one blade, each is called a leaflet<br />There are several patterns of...
Compound Leaves<br />Here is another example of a pinnately compound leaf<br />Remember, you can determine what is a leaf ...
Compound Leaves<br />Another pattern is palmately compound leaves<br />This one has 7 leaflets<br />
Compound Leaves<br />Once again, the way to tell a leaf from a leaflet is to look for the axillary bud<br />This is diffic...
Compound Leaves<br />One more pattern is also common and is doubly compound<br />This particular pattern is called bipinna...
Leaf Adaptations<br />Leaves can be modified to perform many different functions<br />These leaves are modified to catch i...
Modified Leaves<br />This Pacific Northwest native plant has leaves modified for vegetative reproduction<br />Piggyback pl...
More Modified Leaves<br />Floating leaves on a water lily<br />Spines on a cactus<br />
Roots<br />Since roots are underground, we seldom think about their presence<br />Major functions include support, absorpt...
Roots<br />Even though we do not usually see roots, they are sometimes massive structures underground<br />For example, ro...
Roots<br />Woody plants also have woody roots<br />Clip art showing roots of a tree<br />
Roots<br />Carrots, like those shown here in a pretend bunny, are tap roots.  Their main structure is a single enlarged ro...
Roots<br />Roots of many if not most herbaceous plants are fibrous, such as in this bulb<br />Clip art<br />
Flowers and Fruits<br />The existence of flowers is one of the reasons we garden<br />Even vegetable gardens usually requi...
Flowers<br />The purpose of flowers is to produce seeds<br />A side product is that gardeners and pollinators can enjoy th...
Flowers<br />A typical flower has four countable parts: Sepals, petals, stamens and pistils<br />Sepals and petals are the...
Flowers<br />Many flowers are not typical<br />In this iris, for example, the three smaller petal-like structures are acut...
Flowers<br />This trillium has the more typical pattern with three green sepals and three white petals<br />The sepals are...
Monocot Flowers<br />Plants with flower parts in groups of 3 or multiples of 3 are usually in the subgroup Monocots<br />N...
Dicot Flowers<br />Flowers with flower parts in groups of 2,4,5 or multiples are usually Dicots<br />This flower has 4 pet...
Dicot Flowers<br />These flowers also have 4 petals<br />Look for the 4 smaller sepals<br />Also note the vein pattern is ...
Dicot Flowers<br />In this penstemon, the petals are fused into a tube<br />You can still determine that it has 5 petals h...
Dicot Flowers<br />Notice that these flowers also have a fused petal tube, and you can distinguish 5 lobes<br />Also note ...
Flowers That Break the Rules<br />Many flowers “break the rules”—learning to be observant will help you know plants better...
Flowers That Break the rules<br />In dogwoods, what appear to be petals are actually modified and colorful leaves called b...
Flowers That Break the Rules<br />Some flower form tight clusters such as this wild carrot<br />Each structure has many fl...
Flowers That Break the Rules<br />All plants of the sunflower family form flowering structures called flowering heads<br /...
Flowers That Break the rules<br />This is another member of the sunflower family<br />Notice the tiny circular ring of flo...
The Sexual Parts<br />Although petals and sepals can be attractive, the real work of the flower occurs in the sexual parts...
The Sexual Parts<br />Look carefully at the central part of this flower<br />Look for 6 stamens and 1 central pistil<br />...
The Sexual Parts<br />In this flower, note the 5 stamens and central pistil<br />Flannelbush, Fremontodendron californicum...
The Sexual Parts<br />This flower has numerous stigmas ready to release their pollen<br />In the center is one pistil with...
Fertilization<br />Once pollination occurs, the pollen grain begins to grow and sends a tube down through the pistil<br />...
Fruits and Seeds<br />Seeds of flowering plants are carried in some kind of fruit structure<br />This Asian pear is a kind...
Fruits and Seeds<br />Seeds of this wild plant called a baneberry are most likely disseminated by birds<br />The seeds are...
Fruits and Seeds<br />Seeds of these lupines are carried in pods<br />Pods open along lines to release the seeds when they...
Fruits and Seeds<br />Seeds of milkweeds have white parachute like attachments<br />These are disseminated by wind<br />
Fruits and Seeds<br />This is cow parsnip which has flowers in the umbel form<br />This flat-topped structure persists in ...
Fruits and Seeds<br />Beechnut produces seeds that are nuts<br />The nuts are carried within an outer structure that split...
Fruits and Seeds<br />This pod has opened to reveal the seeds inside<br />Each seed is capable of producing a new plant wh...
Seed Germination<br />Under suitable conditions seeds germinate into new plants and the cycle starts anew<br />Clip art<br />
This is the End<br />This is the end of our brief beginning tour of botany for gardeners<br />We have only touched the sur...
Botany Primer for Gardeners<br />Created by Linda McMahan, Botanist and Community Horticulture Faculty, Oregon State Unive...
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Botany Primer For Gardeners

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Presentation designed for a 3-hr teaching session for master gardeners in Oregon. The presentation is for beginners and covers many botanical subjects at that level. It is hoped that learners will be intrigued enough to discover more information on their own

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Botany Primer For Gardeners

  1. 1. Botany Primer for Gardeners<br />Linda R McMahan, PhD<br />Botanist & Extension Horticulturist<br />Oregon State University Extension<br />linda.mcmahan@oregonstate.edu<br />
  2. 2. What We Will Cover<br />Plant Diversity <br />Algae, fungi and lichens<br />Spore producing plants – mosses, liverworts, ferns<br />Seed plants – conifers, ginkgo, and flowering plants <br />Plant Structure and Growth<br />Stems and roots <br />Leaf structure<br />Flowers and reproduction<br />
  3. 3. Plant Diversity<br />From ancient time when we began studying the world around us, we tried to understand our surroundings by labeling plants and animals<br />Our current scientific understanding continues to refine relationships, but historically, many organisms have been considered to be plants even if they are not now considered to be so<br />I will use the historic understanding and explain modern differences as we proceed <br />
  4. 4. Plant Diversity<br />The classification of various kinds of plants is based on reproduction <br />Spore producing plants appeared on earth before seed producing plants<br />Later, seed plants became more common—these are also the ones most common in our landscapes and gardens <br />
  5. 5. Plant Diversity<br />Goal: Learning the patterns of diversity will help us learn to garden with nature rather than working against it<br />Fallen leaves inside umbrella plant, Darmerapeltatum<br />
  6. 6. I. Organisms that reproduce through spores<br />Algae and fungi<br />Lichens<br />Slime Molds <br />Mosses<br />Liverworts and relatives<br />Horsetails<br />Ferns<br />Sori, the spore carrying bodies on ferns, here a sword fern<br />
  7. 7. Algae and Fungi<br />Some algae are considered to be plants and some are not--fungi now reside in a separate Kingdom but many people think of them as plants<br />Both reproduce using some form of spore or similar structure<br />
  8. 8. Algae<br />Include many different kinds, but the most familiar are those of streams, ponds and at the ocean shore washed up on the sand or growing on rocky shores<br />
  9. 9. Are Algae A Problem?<br />Algae by themselves are not a problem-it is not a parasite for example<br />Because growth of algae requires moisture and nutrients, it will grow where these are available, such as polluted streams. Algae grows in nutrient rich streams and on sidewalks because it can find required nutrients there. Control may be necessary for safety or other reasons, but the algae itself is not the cause of the harm, they just take advantage of the conditions.<br />
  10. 10. Fungi<br />Many kinds of fungi occur on earth<br />When you say “fungus”, most people will answer “mushroom” but fungi are much more complex<br />As we shall see, by far the most fungi are beneficial organisms but a few do cause diseases which are of concern to gardeners<br />It is important to distinguish between different kinds and not label all fungi as “bad” <br />
  11. 11. Fungi<br />Some mushrooms and other fungi are also toxic, but this is rarely a concern. Unless you know they are a problem, please don’t treat mushrooms with fungicides because this will interfere with their positive interactions with plants and the environment.<br />For controlling fungi that cause disease, follow the recommendations of your local or state cooperative extension office.<br />
  12. 12. Mushrooms in the Lawn<br />Gardeners who are worried about safety can seek positive identification and information, or rake up the mushrooms and discard or compost them<br />
  13. 13. Positive Benefits of Fungi<br />Fungi are one of earth’s major decomposers, helping to return organic matter to enrich our soils<br />Soil fungi form mutually beneficial relationships with plants called mycorrhizae<br />
  14. 14. How Fungi Reproduce<br />Fungi reproduce through spores that become airborne<br />The visible part of a fungus is usually the spore-producing body<br />The larger mass of the fungus is fine fungal strands that are often underground or inside a decaying organism<br />A “mushroom” is one kind of fungal spore producing body<br />
  15. 15. Fungi<br />Mushrooms and other spore producing bodies are often the most visible part of the fungus<br />Mushrooms growing in an arc or ring are sometimes called a “fairy ring”<br />Yellow houseplant mushroom<br />
  16. 16. Not all spore producing bodies are “mushrooms”<br />Cup-like spore producing bodies in cracks in a brick walkway<br />Cup style spore bodies in moss on a decaying branch<br />
  17. 17. Mycorrhizae<br />Most soil fungi form relationships with most plants in a mutually beneficial relationship called mycorrhizae<br />Perhaps every plant shown in this forest clearing has associations with soil fungi<br />
  18. 18. Mycorrhizae<br />Mycorrhizae are found in the roots of the plants where tissues of the two organisms intertwine<br />Fungal strands are in contact with the soil and extend the absorption capacity of the roots<br />Fungi gain the benefit of photosynthetic nutrients made by the plants<br />
  19. 19. A new way to look at forests and gardens<br />Part of the magic of this relationship is that individual plants may form associations with dozens of different fungi<br />And, each fungus may form associations with dozens of trees <br />Together, these create a network of interactions<br />
  20. 20. Slime Molds<br />Slime molds are not technically fungi nor plants<br />They grow in moist, usually warm conditions such as forests and damp gardens<br />They are another form of decomposer but can alarm people who have not seen them before<br />Slime mold spore producing bodies on turf grass. Oregon State University Plant Clinic<br />
  21. 21. Slime molds in the garden<br />Slime molds have two phases. A moving mass first grows on decaying leaves, compost, or stumps. The spore producing phase is harder and often colorful. Both phases are ephemeral, disappearing only a few days or weeks after their appearance.<br />Spore producing structures of a slime mold on the back of an oak leaf<br />
  22. 22. Lichens, a “special” group<br />Lichens are usually small and are not individual organisms<br />Instead, they are a combination of two different organisms—one is a fungus, and the other is algae<br />British soldiers, a ground dwelling lichen<br />
  23. 23. Lichens<br />Most are gray or greenish<br />The visible part is the fungus, the algae are inside<br />Lichens are another mutually beneficial relationship<br />Several kinds of lichens on a tree branch <br />
  24. 24. Lichens<br />Both algal and fungal partners benefit from this relationship<br />Algae gain a moist environment and the fungus gains photosynthetic nutrients<br />Together, they inhabit places like this rock where neither could if they were alone<br />Lichens growing on a rock<br />
  25. 25. Lichens<br />Some gardeners are worried about lichen, but they are not a disease and cause no harm to the plant<br />Various lichens are indicative of good or bad air quality, an aid to understanding our environment<br />White and brown lichen on a tree trunk<br />
  26. 26. Mosses<br />Are common in the moist habitats<br />Reproduce by spores<br />Are of short stature because they lack an organized vascular system to move water and nutrients<br />Help maintain moisture and provide homes for small creatures<br />Mosses and tiny mushrooms on a downed log<br />
  27. 27. Mosses<br />Mosses are a healthy part of gardens and ecosystems<br />They often grow in lawns when the lawns themselves are not robust<br />Mosses are opportunists and will grow wherever the habitat is appropriate<br />
  28. 28. Liverworts and other forest floor plants<br />Liverworts and their relatives have been on earth since ancient times<br />They reproduce by spores<br />They usually grow in natural habitats but sometimes can be found in gardens<br />They are not harmful in a garden setting<br />Selaginella, usually a forest dweller<br />
  29. 29. Liverworts<br />One species of liverwort has become adapted to live in nursery pots and is considered to be a pest by nursery owners<br />Once in the garden, they usually disappear after a time and cause no harm<br />
  30. 30. Horsetails<br />Perhaps no plant has caused such concern to tidy gardeners as the common horsetail. Rapidly spreading underground in a favorable environment, this plant can become quite a pest.<br />Horsetail, Equisetum, showing the spore producing branches that appear before the typical green branches<br />
  31. 31. Horsetails<br />Here is the familiar horsetail form<br />Horsetails of many kinds are native around the world<br />Control is usually through persistent hand weeding or tolerance<br />
  32. 32. Ferns<br />Ferns also reproduce by spores <br />Ferns are popular garden plants and some forms thrive in most, shady garden conditions<br />Licorice fern growing on a tree trunk<br />
  33. 33. Ferns<br />Typically the fern leaves, called fronds, uncurl as they open such as shown here<br />Bracken fern in spring<br />
  34. 34. Ferns<br />Spores are produced on the backs of the fronds or sometimes on separate modified leaves that only bear spores<br />Sword fern spore bodies<br />
  35. 35. 2. Plants that produce seeds<br />We will cover three kinds of seed bearing plants<br />Ginkgo<br />Conifers<br />Flowering Plants<br />Fruits of red osier dogwood, a flowering plant<br />
  36. 36. Ginkgo<br />Very ancient plants once though to be extinct<br />Related to conifers but have different reproductive structures<br />They are neither conifers nor flowering plants but in a group all their own<br />Fall foliage and seed bearing structures on a mature female tree<br />
  37. 37. Ginkgo biloba<br />Good landscape tree, drought and pollution tolerant<br />Distinctive leaf form often used in artistic work<br />Native to China<br />
  38. 38. Conifers<br />Bear their seeds in cones<br />Conifers also have needles or scales<br />When seeds mature, cones usually open<br />
  39. 39. Conifers<br />Large group with many trees and shrubs<br />Popular in gardens, particallybecause most are evergreen<br />Pines, firs, cedars, juniper, larch, and many more<br />An ornamental conifer with colorful cones<br />
  40. 40. Conifers<br />Cones are made up of overlaping scales<br />In new female cones, the ovules are inside the cone but the scales are open to allow pollination<br />After pollination, the scales usually close while the seeds mature<br />Cone on an ornamental larch<br />
  41. 41. Conifers<br />Pollination time differs for each species<br />Pollen is produced in tiny cones (dark orange in this tree) which is transferred by the wind to the tiny female cones at the tips of the branches<br />New cones and year-old cones on a pine species<br />
  42. 42. Flowering Plants<br />A very large group, the latest to appear on earth<br />Developing seeds are protected within a solid structure which becomes a fruit<br />Pollen must actually grow through tissue to fertilize the ovum<br />
  43. 43. Flowering Plants<br />Include trees, shrubs, herbaceous plants, vines<br />Are very popular garden plants<br />Are highly adapted to particular forms of pollination<br />Many have very close mutually beneficial relationships with insect pollinators<br />Gaillardia or blanket flower attracts bees and butterflies<br />
  44. 44. Pollination<br />Is the process of transferring pollen from one flower to another<br />Typically, can be by wind, insects, water, birds, bats, or human intervention<br />Honey bee pollinating a Ceanothus flower<br />
  45. 45. Pollination<br />Plants pollinated by insects are typically sweet smelling, colorful, and have places for insects to land<br />The “reward” for pollination is food from nectar or pollen<br />Bumblebee on an aster<br />
  46. 46. Pollination<br />Plants attracting butterflies also provide nectar—they often have a large flat surface to support the butterfly’s body<br />Butterfly pollinated plants often have “butterfly partners” that use the plant as places to lay their eggs<br />
  47. 47. Pollination<br />Many other garden plants are pollinated by hummingbirds<br />These flowers tend to be red or orange<br />Birds can see these colors but bees cannot<br />Red columbine, Aquilegia canadensis<br />
  48. 48. Pollination<br />Plants pollinated by wind have less colorful flowers<br />Pollen is usually produced in catkins which contain only male flowers<br />Pollen is carried by the wind to female flowers that produce seeds<br />Catkins on a willow<br />
  49. 49. Fruits<br />When seeds mature, they are carried in fruits<br />Fruits can be fleshy or dry and take many forms<br />Berries as shown here are one type of fruit<br />Calicarpa americana, the American beautyberry<br />
  50. 50. More Fruits<br />Mimulus guttatus, yellow monkey flower has dry fruits called pods<br />Big leaf maple, Acer macrophyllum has dry fruits called samaras<br />
  51. 51. 3. Plant Anatomy<br />Seed bearing plants all share the same basic structures<br />Typical parts include leaves, stems, roots, and flowers<br />Differences are in the “details” which help us tell one plant from another<br />
  52. 52. Overall Plant Structure<br />This is sweet cicely, a plant native to Oregon<br />Botanists know this because it has white flower heads, each with many flowers of a certain type<br />Another clue is the finely divided leaves in a particular pattern<br />
  53. 53. Stems<br />Provide overall support<br />Create the “architecture” characteristic of each plant<br />Have internal vascular systems for transport of water, minerals, and photosynthetic nutrients<br />
  54. 54. Stem Structure<br />This stem is woody, with wood cells for support<br />The main stem has a side branch at a place called a node<br />The side branch has two buds, one at the end – a terminal bud, and one on the side, called a lateral bud<br />
  55. 55. Stem Structure<br />Here is another winter twig with no leaves<br />Plants that loose leaves during dormancy are called deciduous<br />Note the leaf scars on the side where the leaves fell off in the fall<br />Also note that the terminal bud has scales<br />
  56. 56. Stem Structure<br />Each year, when the buds break or start to grow, the bud scales fall off, leaving bud scale scars<br />If you look carefully, you can sometimes see these scars circling the branch<br />This helps us determine which is this year’s growth and which is last year’s<br />
  57. 57. Plant Growth Structure<br />Buds are of many types including flower buds, branch buds, and mixed buds<br />Lateral branch or mixed buds can grow into branches under the right conditions<br />
  58. 58. Plant Growth Structure<br />Note that the small branch is growing from a node area, just above the leaf<br />The buds that produce branches are usually in this location, leading to another name: axillarybud<br />
  59. 59. Kinds of Branching<br />The kind of branching on the last slide is called alternate <br />Here, the type of branching is called opposite<br />The kind of leaf pattern and branching pattern leads to different shapes of plants<br />
  60. 60. Woody Stems<br />Woody plants grow differently than herbaceous plants<br />Herbaceous plants are most commonly annuals, biennials, or perennials, which create new aerial growth each year<br />
  61. 61. Woody Stems<br />Here is a cross-section through a tree, showing typical woody structure<br />On the outside is bark<br />Right inside the bark is tissue called phloem that actively transports photosynthetic nutrients<br />
  62. 62. Woody Plants<br />The inner part is xylem tissue that transports water and is considered to be the “woody part”<br />This is also where we see growth rings, which can indicate the age of the tree <br />
  63. 63. Woody Plants<br />One growth ring is formed each year<br />At the beginning of each growth season, cells are large<br />At the end of the season, they are smaller and more dense, leading to the darker “rings”<br />The oldest growth of the tree is in the center<br />
  64. 64. Woody Plants<br />Nutrient and water transport happen on the outer edges of the tree or shrub<br />For this reason, it is important to protect the bark; injury can lead to disruptions of nutrient and water flow and growth<br />
  65. 65. Leaves<br />Leaves are usually the site of the process of photosynthesis, using the sun’s energy to create sugars and other nutrients<br />They also have unique patterns that help us identify plants<br />
  66. 66. Leaf Characteristics – Vein Patterns<br />The vascular system of plants moves through leaves in 3 kinds of patterns<br />The pattern shown here is called a parallel vein pattern<br />Parallel veins on a lily plant<br />
  67. 67. Parallel Vein Patterns<br />Parallel vein patterns <br />Occur in a group of plants called Monocotyledons or “Monocots” for short<br />They include grasses, lilies, onions, and many other related groups<br />
  68. 68. More Parallel Vein Patterns<br />Mianthemum dilitatum, false lily of the valley<br />Disporum species<br />
  69. 69. Pinnately Veined<br />Vein patters are also sometimes called venation<br />Pinnatelyveined leaves have veins in a feather-like pattern<br />This is a common pattern and signifies that the plant is in the group Dicotyledon or “Dicots” for short<br />
  70. 70. More Pinnate Vein Patterns<br />Leaf skeleton of a magnolia<br />
  71. 71. Palmately Veined Leaves<br />Palmately veined leaves are the third pattern<br />Main veins arise from the point of attachment, sort of like the fingers from the palm of a hand<br />These are also found in the group called “Dicots”<br />Coltsfoot<br />
  72. 72. More PalmatelyVeined Leaves<br />Fringecup, Tellima gandiflora<br />A water lily<br />
  73. 73. Petioles<br />Most leaves have a stem like structure connecting the leaf blade to the stem<br />These are called petioles<br />Some leaves do not have petioles, which helps us distinguish one plant from another<br />
  74. 74. Leaf Edges<br />Patterns of leaf edges also help us distinguish plants<br />This is one of many edge patterns or margins<br />This one is called a toothed margin<br />
  75. 75. Simple Leaves<br />Leaves with just one undivided leaf blade are called simple leaves<br />Several simple leaves on a branch are shown here<br />Oceanspray, Holodiscus discolor<br />
  76. 76. Simple Leaves<br />Remember, each leaf has a bud associated with it to facilitate branching<br />Several leaves and the associated axillary buds are shown here<br />Salal, Gaultheria shallon<br />
  77. 77. Compound Leaves<br />Compound leaves have more than one blade, each is called a leaflet<br />There are several patterns of compound leaves, this one is pinnately compound and has 7 leaflets<br />Oregon ash, Fraxinus latifolius<br />
  78. 78. Compound Leaves<br />Here is another example of a pinnately compound leaf<br />Remember, you can determine what is a leaf by looking for the bud at its base<br />This plant gives us a clue because the entire leaf is reddish- it has 11 leaflets<br />Berberis nervosa, long leaf Oregon grape<br />
  79. 79. Compound Leaves<br />Another pattern is palmately compound leaves<br />This one has 7 leaflets<br />
  80. 80. Compound Leaves<br />Once again, the way to tell a leaf from a leaflet is to look for the axillary bud<br />This is difficult to determine in a photographs but is usually much easier in a hand-held sample<br />Wild lupine<br />
  81. 81. Compound Leaves<br />One more pattern is also common and is doubly compound<br />This particular pattern is called bipinnately compound<br />Sometimes they are described as finely divided in herbaceous species<br />
  82. 82. Leaf Adaptations<br />Leaves can be modified to perform many different functions<br />These leaves are modified to catch insects in an insectivorous plant<br />California pitcher plant, Darlingtoniacalifornica<br />
  83. 83. Modified Leaves<br />This Pacific Northwest native plant has leaves modified for vegetative reproduction<br />Piggyback plant, Tolmiea menziesii<br />
  84. 84. More Modified Leaves<br />Floating leaves on a water lily<br />Spines on a cactus<br />
  85. 85. Roots<br />Since roots are underground, we seldom think about their presence<br />Major functions include support, absorption of water and minerals, and storage of carbohydrates and other photosynthetic nutrients<br />Large underground storage root of the wild cucumber<br />
  86. 86. Roots<br />Even though we do not usually see roots, they are sometimes massive structures underground<br />For example, roots of this ash tree, and even the herbaceous plants beneath it, will extend many feet beyond the canopy of the above ground part of the plant<br />Veratrum emerging in the spring next to the trunk of an Oregon ash, Fraxinus latifolius<br />
  87. 87. Roots<br />Woody plants also have woody roots<br />Clip art showing roots of a tree<br />
  88. 88. Roots<br />Carrots, like those shown here in a pretend bunny, are tap roots. Their main structure is a single enlarged root with smaller roots off the surface<br />Tap roots often serve as storage for carbohydrates and other nutrients<br />
  89. 89. Roots<br />Roots of many if not most herbaceous plants are fibrous, such as in this bulb<br />Clip art<br />
  90. 90. Flowers and Fruits<br />The existence of flowers is one of the reasons we garden<br />Even vegetable gardens usually require flowers because fruits cannot form without them<br />passionflower<br />
  91. 91. Flowers<br />The purpose of flowers is to produce seeds<br />A side product is that gardeners and pollinators can enjoy the benefits they provide<br />Flowers of Rosa nutkana (Nutka rose) and Physocarpus capitatus (ninebark)<br />
  92. 92. Flowers<br />A typical flower has four countable parts: Sepals, petals, stamens and pistils<br />Sepals and petals are the outer parts—sepals are usually green and petals are usually colorful<br />
  93. 93. Flowers<br />Many flowers are not typical<br />In this iris, for example, the three smaller petal-like structures are acutally sepals. The larger three are the petals<br />
  94. 94. Flowers<br />This trillium has the more typical pattern with three green sepals and three white petals<br />The sepals are the outer layer of a flower and usually cover the flower bud before it opens<br />Both iris and trillium are Monocots<br />Trillium ovatum<br />
  95. 95. Monocot Flowers<br />Plants with flower parts in groups of 3 or multiples of 3 are usually in the subgroup Monocots<br />Note the parallel venation on this plant, which support that classification<br />Slinkpod, Scoliopus bigelovii<br />
  96. 96. Dicot Flowers<br />Flowers with flower parts in groups of 2,4,5 or multiples are usually Dicots<br />This flower has 4 petals so is most likely a Dicot<br />Notice that the central stigma (we will cover those later) is also split into 4 at the tip <br />Flower of a Clarkia species<br />
  97. 97. Dicot Flowers<br />These flowers also have 4 petals<br />Look for the 4 smaller sepals<br />Also note the vein pattern is pinnate<br />This is a Dicot<br />Fireweed, Epilobium<br />
  98. 98. Dicot Flowers<br />In this penstemon, the petals are fused into a tube<br />You can still determine that it has 5 petals however by looking at the number of flower lobes<br />Notice the nectar guides, lines that point toward the center of the flower<br />
  99. 99. Dicot Flowers<br />Notice that these flowers also have a fused petal tube, and you can distinguish 5 lobes<br />Also note the nectar guides in this flower<br />This is another Dicot<br />Yellow monkeyflower, Mimulus guttatus<br />
  100. 100. Flowers That Break the Rules<br />Many flowers “break the rules”—learning to be observant will help you know plants better<br />In skunk cabbage and some other plants, the colorful part is a spathe and the flowers themselves are very small and located on the whitish spikes<br />
  101. 101. Flowers That Break the rules<br />In dogwoods, what appear to be petals are actually modified and colorful leaves called bracts<br />The many flowers are in clusters in the center of the bracts<br />
  102. 102. Flowers That Break the Rules<br />Some flower form tight clusters such as this wild carrot<br />Each structure has many flowers, and each of these can bear seeds<br />This kind of flat-top structure is called an umbel-umbel plants often attract butterflies<br />
  103. 103. Flowers That Break the Rules<br />All plants of the sunflower family form flowering structures called flowering heads<br />It looks like one large flower but instead is many tiny ones grouped together<br />Each “petal” is a separate flower for example<br />
  104. 104. Flowers That Break the rules<br />This is another member of the sunflower family<br />Notice the tiny circular ring of flowers in the flowering head in the lower right<br />Each of the tiny flowers in this ring is blooming and each will produce a single seed<br />
  105. 105. The Sexual Parts<br />Although petals and sepals can be attractive, the real work of the flower occurs in the sexual parts<br />Stamens bear the pollen<br />Pistils bear the ovules that become seeds when fertilized<br />Erythronium flower with pendulous stamens and pistils<br />
  106. 106. The Sexual Parts<br />Look carefully at the central part of this flower<br />Look for 6 stamens and 1 central pistil<br />The pistil ends with a pink stigma split three ways<br />The stigma is usually sticky and will hold pollen delivered by a pollinator, in this case probably a bee<br />A cat’s ear, Calochortus species<br />
  107. 107. The Sexual Parts<br />In this flower, note the 5 stamens and central pistil<br />Flannelbush, Fremontodendron californicum<br />
  108. 108. The Sexual Parts<br />This flower has numerous stigmas ready to release their pollen<br />In the center is one pistil with the stigma divided into many parts<br />Camelia sasanqua<br />
  109. 109. Fertilization<br />Once pollination occurs, the pollen grain begins to grow and sends a tube down through the pistil<br />This leads to fertilization and the production of seeds<br />A species of wild rose, Rosa sp.<br />
  110. 110. Fruits and Seeds<br />Seeds of flowering plants are carried in some kind of fruit structure<br />This Asian pear is a kind of fruit called a pome and the seeds are inside<br />Seeds are disseminated by foraging animals and the seeds pass through the digestive system<br />
  111. 111. Fruits and Seeds<br />Seeds of this wild plant called a baneberry are most likely disseminated by birds<br />The seeds are toxic, but since birds do not chew, the seeds pass unharmed through the bird’s digestive tract<br />Actea rubra<br />
  112. 112. Fruits and Seeds<br />Seeds of these lupines are carried in pods<br />Pods open along lines to release the seeds when they are ready<br />The red flowers are another species, Mimulus cardinalis<br />Lupinus polyphyllus<br />
  113. 113. Fruits and Seeds<br />Seeds of milkweeds have white parachute like attachments<br />These are disseminated by wind<br />
  114. 114. Fruits and Seeds<br />This is cow parsnip which has flowers in the umbel form<br />This flat-topped structure persists in seed formation<br />This is one of the plants that also supports the growth of butterflies<br />
  115. 115. Fruits and Seeds<br />Beechnut produces seeds that are nuts<br />The nuts are carried within an outer structure that splits open at maturity and releases the seeds to the soil below<br />They may also be carried by animals to new locations<br />
  116. 116. Fruits and Seeds<br />This pod has opened to reveal the seeds inside<br />Each seed is capable of producing a new plant which grows from a tiny embryo inside<br />Peony seeds<br />
  117. 117. Seed Germination<br />Under suitable conditions seeds germinate into new plants and the cycle starts anew<br />Clip art<br />
  118. 118. This is the End<br />This is the end of our brief beginning tour of botany for gardeners<br />We have only touched the surface and there is much more to discover and know<br />I wish you luck on this journey<br />Echinacea purpurea ‘White Swam’<br />
  119. 119. Botany Primer for Gardeners<br />Created by Linda McMahan, Botanist and Community Horticulture Faculty, Oregon State University Extension Service in 2010<br />All photographs except as noted are those of the author. This presentation and included materials may be freely used for educational purposes. For other uses, please contact the author at<br />linda.mcmahan@oregonstate.edu<br />
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