Floral formulas and diagrams provide a standardized way to record and communicate key characteristics of flower structure and morphology. A floral formula uses symbols to represent floral symmetry, number of sepals, petals, stamens and carpels. Additional symbols indicate features like connation and adnation. A floral diagram is a stylized cross-section view that also shows these characteristics. The document outlines the symbols used in floral formulas and diagrams and provides examples, demonstrating how they can concisely summarize important floral traits.
floralformullae.pptx it is all about the arrangement of floral whorls within ...shikhummar
This presentation is about the floral formulla. It provide the information regarding the number and arrangement of the floral whorls with respect to each other.
Floral formulas and diagrams are used to concisely summarize key characteristics of flower structures. Floral formulas use symbols to describe floral symmetry, number of sepals, petals, stamens and carpels. Additional symbols indicate features like connation, adnation, ovary position and more. Floral diagrams are cross-sectional illustrations that similarly show symmetry and part relationships, but cannot show ovary position like formulas can. Together, formulas and diagrams provide useful shorthand for comparing angiosperm flower characteristics.
Division Anthophyta contains flowering plants (angiosperms) which differ from non-flowering seed plants (gymnosperms) in producing flowers and fruits. Angiosperms enclose their ovules within a carpel and after fertilization the ovule develops into a seed within the fruit. Flowers function to protect gametes and aid in pollination and fertilization. A flower typically has four specialized whorls - calyx, corolla, androecium and gynoecium. Floral parts can be described using formulas and diagrams which indicate symmetry, part numbers and relationships.
the floral formula tells us about the nature of flowers. the floral diagram represents the plan of arrangements of floral whorl in relation to the mother axis.
The document describes various parts and types of flowers. It defines terms like pistil, stigma, style, ovary, stamen, petal, sepal, complete flower, incomplete flower, perfect flower, imperfect flower. It discusses classification of flowers into complete/incomplete and perfect/imperfect. It also describes types of flowers like monoecious, dioecious, pistillate, staminate. Additionally, it covers floral formulas, parts of an inflorescence like raceme, spike, head, corymb, umbel and types of fruits.
The document describes the development of flowers in Arabidopsis thaliana. It discusses:
1) The ABC model of floral organ identity specification, which proposes that three classes of genes (A, B, and C) interact to specify the four types of floral organs in each whorl.
2) The model was later expanded to the ABCE model with the addition of E-function genes that are required together with the ABC genes to specify organ identity.
3) Most of the floral organ identity genes are MADS-box transcription factors that form protein complexes to regulate floral organ development.
This document provides information on floral formulas, diagrams, and three plant families: Fabaceae, Solanaceae, and Liliaceae. It describes the key vegetative and floral characteristics, economic importance, and floral formulas/diagrams for each family. Fabaceae examples include legumes and pulses. Solanaceae includes food crops like tomatoes and peppers. Liliaceae has ornamental flowers and medicinal plants like aloe. Overall, the document outlines the structural features used to classify and identify three economically significant angiosperm families.
floralformullae.pptx it is all about the arrangement of floral whorls within ...shikhummar
This presentation is about the floral formulla. It provide the information regarding the number and arrangement of the floral whorls with respect to each other.
Floral formulas and diagrams are used to concisely summarize key characteristics of flower structures. Floral formulas use symbols to describe floral symmetry, number of sepals, petals, stamens and carpels. Additional symbols indicate features like connation, adnation, ovary position and more. Floral diagrams are cross-sectional illustrations that similarly show symmetry and part relationships, but cannot show ovary position like formulas can. Together, formulas and diagrams provide useful shorthand for comparing angiosperm flower characteristics.
Division Anthophyta contains flowering plants (angiosperms) which differ from non-flowering seed plants (gymnosperms) in producing flowers and fruits. Angiosperms enclose their ovules within a carpel and after fertilization the ovule develops into a seed within the fruit. Flowers function to protect gametes and aid in pollination and fertilization. A flower typically has four specialized whorls - calyx, corolla, androecium and gynoecium. Floral parts can be described using formulas and diagrams which indicate symmetry, part numbers and relationships.
the floral formula tells us about the nature of flowers. the floral diagram represents the plan of arrangements of floral whorl in relation to the mother axis.
The document describes various parts and types of flowers. It defines terms like pistil, stigma, style, ovary, stamen, petal, sepal, complete flower, incomplete flower, perfect flower, imperfect flower. It discusses classification of flowers into complete/incomplete and perfect/imperfect. It also describes types of flowers like monoecious, dioecious, pistillate, staminate. Additionally, it covers floral formulas, parts of an inflorescence like raceme, spike, head, corymb, umbel and types of fruits.
The document describes the development of flowers in Arabidopsis thaliana. It discusses:
1) The ABC model of floral organ identity specification, which proposes that three classes of genes (A, B, and C) interact to specify the four types of floral organs in each whorl.
2) The model was later expanded to the ABCE model with the addition of E-function genes that are required together with the ABC genes to specify organ identity.
3) Most of the floral organ identity genes are MADS-box transcription factors that form protein complexes to regulate floral organ development.
This document provides information on floral formulas, diagrams, and three plant families: Fabaceae, Solanaceae, and Liliaceae. It describes the key vegetative and floral characteristics, economic importance, and floral formulas/diagrams for each family. Fabaceae examples include legumes and pulses. Solanaceae includes food crops like tomatoes and peppers. Liliaceae has ornamental flowers and medicinal plants like aloe. Overall, the document outlines the structural features used to classify and identify three economically significant angiosperm families.
This document provides an overview of flower parts, structures, and types. It begins by stating the learning outcomes, which are to identify flower parts, classify flowers, use floral formulas, and describe flower clusters. It then defines key terms like stamen, pistil, pollen, and floral parts. The document presents examples of different flower structures like gumamela, orchid, and squash. It introduces floral formulas to describe flower symmetry and parts. Formulas use symbols to represent calyx, corolla, androecium and gynoecium parts. The document shows floral formulas for example species and concludes with thanks.
Flowers are the reproductive parts of plants,which are responsible for the production of gametes or sex cells ((non flowering plants).
A flower is modified shoot in which the leaves are modified into floral parts. A blossom propagates a branch from a bud in the axil of a little leaf-like structure called the bract. A bract is commonly green due to presence of chlorophyll and is a very small structure (non flowering plants).
Flowers are the reproductive parts of plants,which are responsible for the production of gametes or sex cells ((non flowering plants).
A flower is modified shoot in which the leaves are modified into floral parts. A blossom propagates a branch from a bud in the axil of a little leaf-like structure called the bract. A bract is commonly green due to presence of chlorophyll and is a very small structure (non flowering plants).
The document discusses flower anatomy. It begins by stating that flowering plants are important for agriculture as major food crops like wheat, rice, corn, and soybeans are flowering plants. It then describes the parts of flowers including the male stamen and female pistil. Flowers can be perfect or imperfect, complete or incomplete. Plants can be monoecious or dioecious. Monocots and dicots differ in their flower structures. Flowers may be solitary or occur in inflorescences, which can take forms like spikes, racemes, panicles and more.
The document discusses basic flower structures including the stigma, style, ovary, locule, ovule, carpel, gynoecium, pollen, anther, filament, stamen, androecium, petal, corolla, perianth, sepal, calyx, receptacle, and pedicel. It provides examples of perfect, imperfect, and variable flowers and describes ovary positions including superior, hypogynous, perigynous, epigynous, inferior, half-superior, and half-inferior. Diagrams of flower structures and formulas are also presented.
This document provides information about snapdragons as the flower of the day and balance and proportion as words of the day. It then discusses different types of flower arrangements including line arrangements, mass arrangements, and combinations of line and mass. Basic designs discussed include mound/round arrangements and vertical arrangements. Elements of arrangements like focal points, fillers, and foliage are also covered.
The document defines and describes the key parts of flowers and leaves. It discusses flower nomenclature and identifies the sepals, petals, stamens, pistils, receptacle, androecium, and gynoecium. It also defines inflorescence patterns like spikes, racemes, panicles, corymbs, cymes, umbels, spadices and describes their characteristics. Leaf nomenclature and shapes, margins, tips and bases are also covered. Examples of student activities like a clay flower are provided.
The document discusses the diversity of flower structures. It describes the main parts of flowers - calyx, corolla, androecium, and gynoecium. The calyx is the outermost structure that protects the flower bud. The corolla contains colorful petals that attract pollinators. The androecium contains stamens that produce and release pollen. The gynoecium or pistil contains the female parts. Flowers can be bisexual if they contain both male and female parts, or unisexual if they only contain one. Flowers also vary in their symmetry, from radially symmetrical to bilaterally symmetrical to asymmetrical. Diagrams of whole flowers, half
This document defines parts of a flower and describes their structure and arrangement. It contains:
1. Definitions of key floral parts including sepals, petals, stamens, carpels, and their arrangement on the receptacle.
2. Descriptions of different types of flowers based on completeness of parts, symmetry, and presence of sexual organs.
3. A scheme for describing flowers that includes origin, condition, size, color, odor, taste, and details of the calyx, corolla, androecium, and gynoecium.
Biological Symmetry is the balanced distribution of duplicate body parts or shapes. The body plans of most multi-cellular organisms exhibit some form of symmetry, either radial symmetry or bilateral symmetry. A small group of organisms do not exhibit symmetry (they are asymmetrical). Many flowers are radially symmetrical and flowering plants demonstrate symmetry of five, more frequently than any other form.
1. The document analyzes the structure of flowers, finding they generally consist of a peduncle, sepals, and petals arranged in whorls.
2. An experiment counting the petals of various flower species found the numbers often followed the Fibonacci sequence.
3. It was determined that about 75% of flowers exhibited this Fibonacci pattern in their petal numbers.
Plant propagation can occur through sexual or asexual methods. Sexual propagation uses seeds while asexual propagation involves vegetative reproduction techniques without seeds, including cuttings, grafting, layering, and tissue culture. Cuttings require specific conditions like humidity and rooting hormones to successfully grow roots. Grafting and budding combine scion cultivars with rootstocks to control size or allow propagation of difficult to root plants. Layering induces roots to form on intact or nearly intact plants. Specialized structures like bulbs, corms, and tubers are also used in propagation. Micropropagation is a rapid asexual technique using specialized equipment and facilities.
1. The document discusses the evolution of early land plants and their adaptations for living on land, including mechanical strength, light catching surfaces, water conducting systems, and nutrient absorption.
2. It then covers the history of major plant groups, including mosses, ferns, and trees. Mosses and ferns reproduce using alternation of generations, alternating between haploid gametophyte and diploid sporophyte generations.
3. The life cycles of mosses and ferns are described in detail, noting the structures and stages in each generation. Ferns produce sporangia in sori on their undersides that release haploid spores.
Plant propagation can occur through sexual or asexual means. Sexual propagation uses seeds while asexual propagation involves vegetative reproduction techniques without seeds, including cuttings, grafting, layering, and micropropagation. Cuttings require specific conditions like humidity and rooting hormones to successfully grow roots. Grafting and budding combine scion cultivars with rootstocks to control size or allow propagation of difficult to root plants. Layering induces roots to form on intact or nearly intact plants. Micropropagation is a rapid, efficient method using specialized equipment and facilities that is useful for mass producing clones. Propagation by seed is the most natural and inexpensive method and is important for large scale agriculture.
This document compares and contrasts sexual and asexual reproduction. Sexual reproduction involves the combination of genetic material from two parent cells to form offspring that are genetically diverse. Asexual reproduction involves one parent and produces offspring that are genetically uniform or identical to the parent. Some examples of asexual reproduction include binary fission, budding, vegetative propagation, and spore formation. Sexual reproduction provides genetic variation that allows populations to adapt, while asexual reproduction allows for rapid reproduction without the need for finding a mate but results in less genetic diversity.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise boosts blood flow, releases endorphins, and promotes changes in the brain which help enhance one's emotional well-being and mental clarity.
This document is a 12-page exam paper for the Cambridge IGCSE Food and Nutrition exam. It contains multiple choice and short answer questions testing knowledge of nutrients, digestion, food labelling, and food packaging. The questions cover topics such as nutrient deficiencies, vitamin C sources and functions, analyzing a packaged food label, increasing fiber intake, enzymes involved in digestion, suitable foods for people with allergies or intolerances, and reasons for food packaging and use-by dates.
Gregor Mendel is known as the "Father of Genetics" and discovered the principles of inheritance through his experiments with pea plants including the principle of independent assortment. Traits are determined by genes located on chromosomes, which are received in homologous pairs with one from each parent. Genes can be dominant or recessive, and a Punnett square can be used to determine the probability of offspring inheriting different traits.
The document discusses enzymes and metabolic reactions in cells. It explains that enzymes are protein catalysts that speed up chemical reactions in the body without increasing temperature. Enzymes work on substrate molecules and are specific to certain substrates. The document outlines factors that affect enzyme activity such as temperature, pH, substrate concentration, and inhibitors. It also discusses models of enzyme activity and how enzymes are regulated through feedback inhibition and precursor activity.
This document discusses enzymes and metabolic reactions. It explains that enzymes are protein catalysts that speed up chemical reactions in cells without increasing temperature. Enzymes work by reducing the activation energy of reactions and are substrate-specific. The active site of an enzyme binds to a specific substrate. Reaction rates are affected by factors like temperature, pH, substrate and inhibitor concentrations. Enzymes are regulated through feedback inhibition when products inhibit enzymes, and precursor activation when substrates activate enzymes.
The document provides information about the history and types of microscopes. It discusses key developments in the microscope, including the first compound microscope in 1590, Robert Hooke using one to observe cells in 1655, and Antonie van Leeuwenhoek discovering single-celled organisms. It also describes the two main types of microscopes - compound light microscopes, which are most widely used, and electron microscopes, which can achieve much higher magnifications. The document concludes with guidelines, vocabulary and procedures for safely and effectively using a light microscope.
Here is a draft essay response:
Viruses are acellular microscopic particles that can only replicate inside of living host cells. They contain either DNA or RNA surrounded by a protein coat called a capsid. Viruses are much smaller than bacteria, ranging from 20-300 nanometers in size.
To reproduce, viruses must first attach and enter a host cell. The capsid binds to specific receptors on the host cell membrane through antigen-antibody interactions. Once inside, the viral nucleic acid is released into the host cell cytoplasm. Viruses then hijack the host cell's machinery and metabolic processes to produce copies of themselves.
Viral DNA or RNA takes over the cell's functions and directs it to produce
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This document provides an overview of flower parts, structures, and types. It begins by stating the learning outcomes, which are to identify flower parts, classify flowers, use floral formulas, and describe flower clusters. It then defines key terms like stamen, pistil, pollen, and floral parts. The document presents examples of different flower structures like gumamela, orchid, and squash. It introduces floral formulas to describe flower symmetry and parts. Formulas use symbols to represent calyx, corolla, androecium and gynoecium parts. The document shows floral formulas for example species and concludes with thanks.
Flowers are the reproductive parts of plants,which are responsible for the production of gametes or sex cells ((non flowering plants).
A flower is modified shoot in which the leaves are modified into floral parts. A blossom propagates a branch from a bud in the axil of a little leaf-like structure called the bract. A bract is commonly green due to presence of chlorophyll and is a very small structure (non flowering plants).
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A flower is modified shoot in which the leaves are modified into floral parts. A blossom propagates a branch from a bud in the axil of a little leaf-like structure called the bract. A bract is commonly green due to presence of chlorophyll and is a very small structure (non flowering plants).
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This document provides information about snapdragons as the flower of the day and balance and proportion as words of the day. It then discusses different types of flower arrangements including line arrangements, mass arrangements, and combinations of line and mass. Basic designs discussed include mound/round arrangements and vertical arrangements. Elements of arrangements like focal points, fillers, and foliage are also covered.
The document defines and describes the key parts of flowers and leaves. It discusses flower nomenclature and identifies the sepals, petals, stamens, pistils, receptacle, androecium, and gynoecium. It also defines inflorescence patterns like spikes, racemes, panicles, corymbs, cymes, umbels, spadices and describes their characteristics. Leaf nomenclature and shapes, margins, tips and bases are also covered. Examples of student activities like a clay flower are provided.
The document discusses the diversity of flower structures. It describes the main parts of flowers - calyx, corolla, androecium, and gynoecium. The calyx is the outermost structure that protects the flower bud. The corolla contains colorful petals that attract pollinators. The androecium contains stamens that produce and release pollen. The gynoecium or pistil contains the female parts. Flowers can be bisexual if they contain both male and female parts, or unisexual if they only contain one. Flowers also vary in their symmetry, from radially symmetrical to bilaterally symmetrical to asymmetrical. Diagrams of whole flowers, half
This document defines parts of a flower and describes their structure and arrangement. It contains:
1. Definitions of key floral parts including sepals, petals, stamens, carpels, and their arrangement on the receptacle.
2. Descriptions of different types of flowers based on completeness of parts, symmetry, and presence of sexual organs.
3. A scheme for describing flowers that includes origin, condition, size, color, odor, taste, and details of the calyx, corolla, androecium, and gynoecium.
Biological Symmetry is the balanced distribution of duplicate body parts or shapes. The body plans of most multi-cellular organisms exhibit some form of symmetry, either radial symmetry or bilateral symmetry. A small group of organisms do not exhibit symmetry (they are asymmetrical). Many flowers are radially symmetrical and flowering plants demonstrate symmetry of five, more frequently than any other form.
1. The document analyzes the structure of flowers, finding they generally consist of a peduncle, sepals, and petals arranged in whorls.
2. An experiment counting the petals of various flower species found the numbers often followed the Fibonacci sequence.
3. It was determined that about 75% of flowers exhibited this Fibonacci pattern in their petal numbers.
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Plant propagation can occur through sexual or asexual methods. Sexual propagation uses seeds while asexual propagation involves vegetative reproduction techniques without seeds, including cuttings, grafting, layering, and tissue culture. Cuttings require specific conditions like humidity and rooting hormones to successfully grow roots. Grafting and budding combine scion cultivars with rootstocks to control size or allow propagation of difficult to root plants. Layering induces roots to form on intact or nearly intact plants. Specialized structures like bulbs, corms, and tubers are also used in propagation. Micropropagation is a rapid asexual technique using specialized equipment and facilities.
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2. It then covers the history of major plant groups, including mosses, ferns, and trees. Mosses and ferns reproduce using alternation of generations, alternating between haploid gametophyte and diploid sporophyte generations.
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2. Floral Formulas
and Diagrams
Convenient shorthand methods of recording floral
symmetry, number of parts, connation and
adnation, insertion, and ovary position.
2
3. Floral Formulas
• A floral formula consists of five symbols indicating from
left to right:
• Floral Symmetry
• Number of Sepals
• Number of Petals
• Number of Stamens
• Number of Carpels
3
5. Flower Part Form and Function
Peduncle Flower stalk.
Receptacle Part of flower stalk bearing the floral organs, at base of flower.
Sepal Leaf-like structures at flower base, protects young flower bud.
Calyx All the sepals together form the calyx.
Petal
Located in and above the sepals, often large and colourful, sometimes scented,
sometimes producing nectar. Often serve to attract pollinators to the plant.
Corolla All the petals together form the corolla.
Stamen
Male part of the flower, consisting of the anther and filament, makes pollen
grains.
Filament The stalk of the stamen which bears the anther.
Anther The pollen bearing portion of a stamen.
Pollen
Grains containing the male gametes. Immature male gametophyte with a
protective outer covering.
CarpelPistil Female part of the flower. Consisting of the stigma, style and ovary.
Stigma Often sticky top of carpel, serves as a receptive surface for pollen grains.
Style
The stalk of a carpel, between the stigma and the ovary, through which the
pollen tube grows.
Ovary
Enlarged base of the carpel containing the ovule or ovules. The ovary matures
to become a fruit.
Ovule
Located in the ovaries. Carries female gametes. Ovules become seeds on
fertilization.
5
6. • The sex of a flower can be described in three ways:
• Staminate flowers: Flowers bearing only male sex parts.
These are sometime referred to as "male flowers".
• CarpellatePistillate Flowers: Flowers bearing only
female sex parts. These are sometimes referred to as
"female flowers".
• HermaphhroditeComplete flowers: Flowers bearing
both male and female sex parts.
6
7. Floral Formulas
• Floral formulas are useful tools for remembering
characteristics of the various angiosperm families. Their
construction requires careful observation of individual
flowers and of variation among the flowers of the same or
different individuals.
7
8. Floral Formula Symbol 1
• The first symbol in a floral formula describes the
symmetry of a flower.
• (*) Radial symmetry – Divisible into equal halves
by two or more planes of symmetry.
• (x) Bilateral symmetry – Divisible into equal halves
by only one plane of symmetry.
• ($) Asymmetrical – Flower lacking a plane of
symmetry, neither radial or bilateral.
8
9. Floral Formula Symbol 2
• The second major symbol in the floral formula is the
number of sepals, with “K” representing “calyx”. Thus,
K5 would mean a calyx of five sepals.
9
10. Floral Formula Symbol 3
• The third symbol is the number of petals, with “C”
representing “corolla”. Thus, C5 means a corolla of 5
petals.
10
11. Floral Formula Symbol 4
• The fourth symbol in the floral formula is the number of
stamens (androecial items), with “A” representing
“androecium”. A∞ (the symbol for infinity) indicates
numerous stamens and is used when stamens number
more than twelve in a flower. A10 would indicate 10
stamens.
11
12. Floral Formula Symbol 5
• The fifth symbol in a floral formula indicates the number
of carpels, with “G” representing “gynoecium”. Thus,
G10 would describe a gynoecium of ten carpels.
12
13. Basic Floral Formula
• *, K5, C5, A∞, G10
• Radial symmetry (*),
• 5 sepals in the calyx (K5)
• 5 petals in the corolla (C5)
• Numerous (12 or more) stamens (A∞)
• 10 carpels (G10)
13
14. Floral Formulas
• At the end of the floral formula, the fruit type is often
listed.
• Example:
• *, K5, C5, A∞, G10, capsule
14
15. More on Floral Formulas
• Connation (like parts fused) is indicated by a circle around the
number representing the parts involved. For example, in a
flower with 5 stamens all fused (connate) by their filaments,
the floral formula representation would be:
A 5
15
16. More on Floral Formulas
• The plus symbol (+) is used to indicate differentation
among the members of any floral part. For example, a
flower with five large stamens alternating with five small
ones would be recorded as:
• A5 + 5.
16
17. More on Floral Formulas
• Adnation (fusion of unlike parts) in indicated by a line
connecting the numbers representing different floral
parts. Thus, a flower that has 4 fused petals (connate
corolla) with 2 stamens fused (or adnate) to this corrola,
is described as:
• C 4 , A 2
17
18. More on Floral Formulas
• The presence of a hypanthium (flat, cuplike, or tubular
structure on which the sepals, petals, and stamens are
borne usually formed from the fused bases of the perianth
parts and stamens) is indicated in the same fashion as
adnation:
• X, K 5, C 5, A 10, G 5
18
19. More on Floral Formulas
• Sterile stamens or sterile carpels can be indicated by
placing a dot next to the number of these sterile
structures. Thus, a flower with a fused (syncarpous)
gynoecium composed of five fertile carpels and five
sterile carpels would be represented as:
• G 5 + 5
19
20. More on Floral Formulas
• Variation in the number of floral parts within a taxon is
indicated by using a dash (-) to separate the minimum and
maximum numbers. For example a taxon that has flowers
with either 4 or 5 sepals would be indicated as:
• K 4-5
20
21. More on Floral Formulas
• Variation with a taxon in either connation or adnation is
indicated by using a dashed (instead of continuous) line:
• C 3, A 6
21
22. More on Floral Formulas
• The lack of a particular floral part is indicated by placing
a zero (0) in the appropriate position in the floral formula.
For example, a carpellate flower (flower with a
gynoecium but no functional androecium) would be
described as:
• *, K3, C3, A0, G2
22
23. More on Floral Formulas
• Flowers with a perianth of tepals (no differentation
between calyx and corolla) have the second and third
symbols combined into one. A hyphen(-) is placed before
and after the number in this symbol. Example:
• *, T-5-, A 10, G 3
23
24. More on Floral Formulas
• A line below the carpel number indicates the superior
position of the ovary with respect to other floral parts.
G3
• A line above the carpel number indicates the inferior
position of the ovary with respect to other floral parts.
G3
•
24
25. Floral Diagrams
• Floral diagrams are stylized cross sections of flowers that
represent the floral whorls as viewed from above.
• Rather like floral formulas, floral diagrams are used to
show symmetry, numbers of parts, the relationships of the
parts to one another, and degree of connation and/or
adnation.
• Such diagrams cannot easily show ovary position.
25
30. 30
EVIDENCE BASED REFERENCE
Title/ Journal Author name Question Methodology Result conclusion
“Floral formulae
updated for
routine inclusion
in formal
taxonomic
descriptions“.
Taxon
Gerhard Prenner,
Richard M.
Bateman
Paula J. Rudall
2010; 59(1): 241-
250.
How to draw
floral formula
and floral
diagram?
Using standard
typeface and
Unicode
character codes,
the
format can
summarise a
wide range of
features,
including:
acropetal
sequence of
organ initiation,
number and
symmetry of
each
whorl of floral
organs (bracts,
sepals, petals
[or tepals],
androecium,
gynoecium,
ovules).
They can usefully be
applied within as well as
between
species, to compare wild
type versus mutant
morphs and different
ontogenetic stages.
Perhaps their greatest
strengths are that
they (1) require only a
universally available
typescript, and (2) bring a
comprehensive
uniformity to the
description of flowers,
acting as a checklist of
features to be examined.
It is recommend that
floral formulae become
a routine component of
diagnoses
in protologues and
other formal taxonomic
(re)descriptions,
functioning as a logical
phenotypic counterpart
to the DNA barcode.