Question

Please identify the a) calyx variation b) corolla variation c) stamen variation and d) pistil variation of the following flowers of:

1) Caesalpinia pulcherrima

2) Cosmos caudatus

3) Dahlia

4) Daucus carota

5) Gypsophila paniculata

6) Lilium orientalis

7) Mimosa pudica

8) Phaseolus vulgaris

9) Helianthus

Answer 1

1. Caesalpinia pulcherrima

Calyx- Calyx petaloid, deeply cleft.

Corolla- petals unequal, clawed, yellow or red, imbricate aestivation.

Stamens -10 free, filaments long, petaloid.

pistil- Ovary flat, monocarpellary, ovules few, style filiform, stigma terminal.

2. Cosmos caudatus

corolla- petals of Asteraceae are joined together by their margins, forming a tubular or strap-shaped corolla (a sympetalous corolla) that often has apical teeth representing the petal tips. The other floral parts are attached to the top of the ovary rather than beneath it.

3. Petals 5, gamopetalous, highly coloured, ligulate, strap-shaped, valvate.

CALYX Modified into pappus or absent or scale-like.

stamen - absent

Pistil- Either absent or if present then bicarpellary, syncarpous, inferior, unilocular with basal placentation, one anatropous ovule; style one; stigma bifid.

4.Daucus carota

Flowers are small greenish-white to dark red.

Calyx with 5 small teeth at the top of the ovary.

Corolla with 5 petals, oval to triangular, red to purple.

5 stamens alternate with the petals.

Ovary is inferior with 2 separate carpels and each surmounted by a style and a stigma.

Flowers are bisexual, sessile or with pedicels slender, 15 mm long.