Floral Formula
Learning the standard symbols and their usage to represent the floral characteristics of a plant in a concise formula.
What is Floral Formula?
A symbolic representation of the characteristics of a flower, including its symmetry, sexuality, and the number and arrangement of its floral parts.
Key formula / rule: Floral Formula Structure
Key points
- To understand the purpose and structure of a floral formula.
- To correctly interpret the symbols used in a floral formula.
- To construct a floral formula for a given flower description.
- To use floral formulas for plant identification.
Common exam trap
Confusing symbols for different floral parts.
Definitions
- Term
Floral Formula
- Meaning
A symbolic representation of the characteristics of a flower, including its symmetry, sexuality, and the number and arrangement of its floral parts.
- Term
Actinomorphic
- Meaning
Radially symmetrical; can be divided into two equal halves by any plane passing through the center. Symbol: ⊕.
- Term
Zygomorphic
- Meaning
Bilaterally symmetrical; can be divided into two equal halves by only one plane. Symbol: %.
- Term
Hypogynous
- Meaning
Ovary is superior; stamens and petals are inserted below the ovary. Symbol: Line below G.
- Term
Perigynous
- Meaning
Ovary is half-inferior; stamens and petals are inserted around the ovary. Symbol: Line through G.
- Term
Epigynous
- Meaning
Ovary is inferior; stamens and petals are inserted above the ovary. Symbol: Line above G.
- Term
Fusion
- Meaning
When floral parts of the same whorl are joined together, indicated by enclosing their number in parentheses.
- Term
Adnation
- Meaning
When floral parts of different whorls are joined together, indicated by a line drawn above the fused whorls.
Learning objectives
To understand the purpose and structure of a floral formula.
To correctly interpret the symbols used in a floral formula.
To construct a floral formula for a given flower description.
To use floral formulas for plant identification.
Formulae
- Name
Floral Formula Structure
- Note
Br=Bracteate, ⊕=Actinomorphic, %=Zygomorphic, ♂=Male, ♀=Female, ☿=Bisexual. Numbers in parentheses indicate fusion. Line above numbers shows adnation. Line relative to G shows ovary position.
- Expression
Br. ⊕/ % ♂/ ♀/ ☿ K(x) C(x) A(x) G(x)
Prerequisites
Basic knowledge of flower anatomy (sepals, petals, stamens, carpels).
Understanding of floral symmetry (actinomorphic, zygomorphic).
Familiarity with terms like bisexual, unisexual, hypogynous, perigynous, epigynous.
Common mistakes
Confusing symbols for different floral parts.
Incorrectly representing fusion or adnation.
Misinterpreting the ovary position.
Forgetting to include all necessary components of the formula.
Keywords
Floral Formula
Botany
Flower Anatomy
Symmetry
Sexuality
Calyx
Corolla
Androecium
Gynoecium
Fusion
Adnation
Hypogynous
Perigynous
Epigynous
NEET UG
Practice preview
What does the symbol 'P' represent in a floral formula when it appears alone?…
easy
Which symbol in a floral formula denotes the calyx?…
easy
A floral formula shows Br ⊕ K(5) C(5) A∞ G(3). What does the notation 'G(3)' indicate?…
medium