The Orchidaceae family is the largest family of flowering plants. Orchids come in various colors except black, and include plants like vanilla. They are found worldwide except Antarctica, especially in tropical regions. Distinguishing characteristics include a lip or labellum opposite the fertile stamen, a single anther forming a cap, and a column formed from reduced filaments and pistil parts. Seeds are dust-like and depend on fungi for germination. Orchids are used ornamentally and for perfume production, as food, and medicine.
this presentation is about family rosaceae. it is also known as Rose family. in this presentation you will study about the occurrence, distribution, vegetative characters, floral characters, important genera and economic importance this family.
this presentation is about family rosaceae. it is also known as Rose family. in this presentation you will study about the occurrence, distribution, vegetative characters, floral characters, important genera and economic importance this family.
This ppt contains all about the family Rosaceae under Dicotyledons. It explains about its systematic position, general characters, phylogenetic affinities, floral formula and diagram, economic importance and important genera under this family.
Malvaceae, or the mallows, is a family of flowering plants estimated to contain 244 genera with 4225 known species. Well-known members of economic importance include okra, cotton, cacao and durian. There are also some genera containing familiar ornamentals, such as Alcea, Malva and Lavatera, as well as Tilia
Classification denotes the arrangement of a single plant or group of plants an distinct category following a system of nomenclature, and in accordance with a particular and well established plan.
Gnetum: A Powerpoint Presentation on Gymnospemsshivduraigaran
The Gymnosperms are a group of seed-producing plants (spermatophytes) that includes conifers (Pinophyta), cycads, Ginkgo, and gnetophytes. The term "gymnosperm" comes from the Greek composite word γυμνόσπερμος (γυμνός gymnos, "naked" and σπέρμα sperma, "seed"), meaning "naked seeds". The name is based on the unenclosed condition of their seeds (called ovules in their unfertilized state). The non-encased condition of their seeds stands in contrast to the seeds and ovules of flowering plants (angiosperms), which are enclosed within an ovary. Gymnosperm seeds develop either on the surface of scales or leaves, which are often modified to form cones, or solitary as in Yew, Torreya, Ginkgo.
The gymnosperms and angiosperms together compose the spermatophytes or seed plants. The gymnosperms are divided into six phyla. Organisms that belong to the Cycadophyta, Ginkgophyta, Gnetophyta, and Pinophyta (also known as Coniferophyta) phyla are still in existence while those in the Pteridospermales and Cordaitales phyla are now extinct.
By far the largest group of living gymnosperms are the conifers (pines, cypresses, and relatives), followed by cycads, gnetophytes (Gnetum, Ephedra and Welwitschia), and Ginkgo biloba (a single living species). Roots in some genera have fungal association with roots in the form of micorrhiza(Pinus), while in some others(Cycas) small specialised roots called coralloid roots are associated with nitrogen fixing cyanobacteria.
Gnetum is a genus of gymnosperms, the sole genus in the family Gnetaceae and order Gnetales. They are tropical evergreen trees, shrubs and lianas. Unlike other gymnosperms, they possess vessel elements in the xylem. Some species have been proposed to have been the first plants to be insect-pollinated as their fossils occur in association with extinct pollinating scorpion flies. Molecular phylogenies based on nuclear and plastid sequences from most of the species indicate hybridization among some of the Southeast Asian species. Fossil-calibrated molecular-clocks suggest that the Gnetum lineages now found in Africa, South America and Southeast Asia are the result of ancient long-distance dispersal across seawater
This ppt contains all about the family Rosaceae under Dicotyledons. It explains about its systematic position, general characters, phylogenetic affinities, floral formula and diagram, economic importance and important genera under this family.
Malvaceae, or the mallows, is a family of flowering plants estimated to contain 244 genera with 4225 known species. Well-known members of economic importance include okra, cotton, cacao and durian. There are also some genera containing familiar ornamentals, such as Alcea, Malva and Lavatera, as well as Tilia
Classification denotes the arrangement of a single plant or group of plants an distinct category following a system of nomenclature, and in accordance with a particular and well established plan.
Gnetum: A Powerpoint Presentation on Gymnospemsshivduraigaran
The Gymnosperms are a group of seed-producing plants (spermatophytes) that includes conifers (Pinophyta), cycads, Ginkgo, and gnetophytes. The term "gymnosperm" comes from the Greek composite word γυμνόσπερμος (γυμνός gymnos, "naked" and σπέρμα sperma, "seed"), meaning "naked seeds". The name is based on the unenclosed condition of their seeds (called ovules in their unfertilized state). The non-encased condition of their seeds stands in contrast to the seeds and ovules of flowering plants (angiosperms), which are enclosed within an ovary. Gymnosperm seeds develop either on the surface of scales or leaves, which are often modified to form cones, or solitary as in Yew, Torreya, Ginkgo.
The gymnosperms and angiosperms together compose the spermatophytes or seed plants. The gymnosperms are divided into six phyla. Organisms that belong to the Cycadophyta, Ginkgophyta, Gnetophyta, and Pinophyta (also known as Coniferophyta) phyla are still in existence while those in the Pteridospermales and Cordaitales phyla are now extinct.
By far the largest group of living gymnosperms are the conifers (pines, cypresses, and relatives), followed by cycads, gnetophytes (Gnetum, Ephedra and Welwitschia), and Ginkgo biloba (a single living species). Roots in some genera have fungal association with roots in the form of micorrhiza(Pinus), while in some others(Cycas) small specialised roots called coralloid roots are associated with nitrogen fixing cyanobacteria.
Gnetum is a genus of gymnosperms, the sole genus in the family Gnetaceae and order Gnetales. They are tropical evergreen trees, shrubs and lianas. Unlike other gymnosperms, they possess vessel elements in the xylem. Some species have been proposed to have been the first plants to be insect-pollinated as their fossils occur in association with extinct pollinating scorpion flies. Molecular phylogenies based on nuclear and plastid sequences from most of the species indicate hybridization among some of the Southeast Asian species. Fossil-calibrated molecular-clocks suggest that the Gnetum lineages now found in Africa, South America and Southeast Asia are the result of ancient long-distance dispersal across seawater
Exploring the Fascinating World of Orchids: A Journey into the Orchidaceae Fa...bewafa8989
The Orchidaceae family, commonly known as orchids, is a diverse and captivating group of flowering plants. With over 28,000 species, orchids exhibit an astonishing array of forms, colors, and fragrances. From the iconic Phalaenopsis to the exotic Vanda, orchids can be found in a wide range of habitats, from tropical rainforests to temperate grasslands. Renowned for their intricate blooms and unique reproductive strategies, orchids have captured the imagination of botanists, artists, and collectors for centuries. This family offers endless opportunities for exploration and discovery, making it a fascinating subject for study and appreciation.
Introduction to Sexual Reproduction in Flowering Plants, Flower, Structure of Flower, Male Reproductive Part of Flower (Stamens), Development of Anther walls, Anther Walls, Microsporangium (Pollen Sac)
Amazing & Weird Plants Around the World...!!!Walid Hashmi
Amazing and weird plant species around the world with their description and Photos.
All the carnivorous plants present in our planet
Fascinating plants facts and wonders of Nature
Similar to characteristics of the family Orchidaceae ppt (20)
Welcome to the Program Your Destiny course. In this course, we will be learning the technology of personal transformation, neuroassociative conditioning (NAC) as pioneered by Tony Robbins. NAC is used to deprogram negative neuroassociations that are causing approach avoidance and instead reprogram yourself with positive neuroassociations that lead to being approach automatic. In doing so, you change your destiny, moving towards unlocking the hypersocial self within, the true self free from fear and operating from a place of personal power and love.
3. ORCHID FAMILY (ORCHIDACEAE)
Largest
family of flowering plants
Terrestrial, epiphytic, or
saprophytic herbs
Orchid flowers come in different
colours except black
Example of an orchid is Vanilla
planifolia, native to Mexico and
Central America
4. Habitat & Distribution
Second
most widely distributed plants in the
world after grasses
Mainly found in warm, moist places
Also found in dry or seasonally cold
environments such as savannahs and semideserts
Found in rainforests, swamps
Worldwide (except Antarctica): mostly
tropics in countries such as Guyana,
Venezuela and Brazil; even the Arctic Circle
and Africa
7. Characteristics of Orchids:
Distinguishing characteristics of the orchid are
found in the flower.
•
The petal aka lip or labellum is opposite the
fertile stamen.
•
The fertile stamen or stamens are on one
side of the flower opposite the lip, making
the flower bilaterally symmetrical.
•
The pistil is in the middle of the flower.
•
Single anther is retained at the top of the
column to form a cap-like structure (in most
orchids).
8.
9. Characteristics of Orchids (con’t):
Reduced
filaments, anthers, style and stigma; fused
into one structure called the column
10. Characteristics of Orchids (con’t):
Stigma is in the form of a shallow
depression on the inner sides of
the column.
In the bud, the lip is oriented
upward but as the flower matures,
it usually ends up downward;
process called resupination.
Outer whorl: 3 sepals
Inner whorl: 3 petals
11.
12. Characteristics of Orchids (con’t):
Rostellum
(flap of tissue covered with sticky
stigmatic liquid) separates the stigma and
anther.
Primitive orchids – pollinia (contains many
pollen) stick to stigmatic fluid on the insects’
backs because the orchids contain no
rostellum.
Advanced orchids – pollinia caudicles are
already attached to the rostellum; a portion
comes off as a sticky pad known as the
viscidium
13.
14. Characteristics of Orchids (con’t):
Fruits
are dry capsules; small, numerous, dust-like
seeds that lack an endosperm (wind dispersal)
The seeds depend on fungus since the fungus
penetrates the seed and provides it with nutrients
to germinate and grow.
Orchids contain several types of nectaries,
including the extrafloral types. Floral fragrances are
diverse, from quite sweet to the smell of rotting liver.
Some nectaries are located on the side lobes of
the lip and secretion along the groove of the lip
occurs.
15. Economic Importance of
Orchids
They
are used mainly as ornamentals (to
beautify the environment).
Their sweet extracts can be used in
perfume production.
Orchids are used as food in Indonesia.
Orchids have medicinal value in China
and Japan.
Several species of orchids are used as a
glue substitute (derived from the
pseudobulbs).
16.
17.
18. References:
Raskoti,
B. B.; 2013; Orchid Distribution;
http://www.ionopsis.com/distribution.htm;
22/09/2013
Welch-Keesey, M.; 2013; Just the Facts about
Orchids;
http://www.indyzoo.com/SiteAssets/pdfs/Handou
tA-OrchidFacts.pdf; 22/09/2013