A student was given a bisexual, actinomorphic pentamerous, gamosepalous and gamopetalous with 5 stamens in epipetallous condition and bicarpillary syncarpour superior ovary and asked to state the floral formula. Which one of the following is the correct floral formula for the given flower?
⊕ ⚥ \(\mathrm{K}_{(5)}\ \overgroup{\mathrm{C}_{(5)}\ \mathrm{A}_{5}}\ \underline{\mathrm{G}}_{(2)}\)
A floral formula condenses the structure of a flower into symbols: ⊕ actinomorphic, ⚥ bisexual, K calyx, C corolla, A androecium, G gynoecium; a number in brackets shows fusion (cohesion), an arc joining two whorls shows adhesion such as epipetalous stamens, and a line below G marks a superior ovary while a line above G marks an inferior ovary.
Step 1 — Actinomorphic and bisexual give ⊕ ⚥.
Step 2 — Five fused sepals (gamosepalous) and five fused petals (gamopetalous) are written K(5) and C(5).
Step 3 — Five epipetalous stamens are written A5 joined to the corolla by an arc over C and A.
Step 4 — A bicarpellary syncarpous superior ovary is written G(2) with a line below G. This is the formula NCERT gives for Solanaceae.
The formula without the arc ignores the epipetalous condition; the one with K5 and C5 shows free sepals and petals; and the one with a line above G shows an inferior ovary.
⊕ ⚥ \(\mathrm{K}_{(5)}\ \overgroup{\mathrm{C}_{(5)}\ \mathrm{A}_{5}}\ \underline{\mathrm{G}}_{(2)}\) option is correct.
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