IGNOU LSE 13 2018 - Describe the Cucurbitaceae and Asclepiadaceae with the reference to th

Question

Describe the Cucurbitaceae and Asclepiadaceae with the reference to the following features :
Leaf, inflorescence, flowers, androecium, gynoecium and floral formula.

23 Jan 2018

Answer :

Word Count : 593

Cucurbitaceae

Leaves:

Alternate, petiolate- petiole long and hollow; simple, lobed, exstipulate, palmately veined; tendrils present in the axil of leaf or opposite to the leaf. In Acanthosicyos the leaves are absent but thorns are present.

Inflorescence:

There is great variation in the inflorescence. Flowers are solitary, or racemose or cymose panicles (Actinostemma).

Flower:

Regular, mostly unisexual rarely bisexual (Schizopepon), incomplete, epigynous, small or large, mostly white or yellow, pentamerous.

Androecium:

Stamens 5, sometimes free or combined to form a central column, anthers dithecous extrorse, dehiscence longitudinal or in curves; androecium may be modified in one of the following ways:

1. In Thaldiantha two pairs of stamens are closely approximated in the lower part of their filaments and the fifth stands apart.

2. In Sincydium the pairs of stamens are united below; in Momordica, Citrullus, the union of pairs of stamens is complete and apparently only three stamens are present.

3. In Sicyos and Sechium the filaments unite to form a central column and the anthers are very much curved.

4. In Cyclantliera the stamens are united into a central column with two ring like pollen chambers running round the top. (Compare with the condition found in Phyllanthus cyclanthera of the Euphorbiaceae).

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