Question

In a plant, androecium has monadelphous stamens, monothecous reinforced anthers and contorted corolla. It is
A) Nerium
B) Rauwolfia
C) Hibiscus
D) Lathyrus

Answer 1

Monadelphous is a phenomenon where the stamens of a flower have joined stalks which results in the form of a tube. Another in the form of only one bag and kidney like structure and hence called monothecous reniform. Contorted fashion of corolla arrangement. This is the given identification feature.

Complete answer:
Nerium have terminal or auxiliary, chyme or umbellate cyme type of inflorescence. They may be Bracteate or ebracteate, complete, pedicellate, hermaphrodite, actinomorphic, tetra or pentamerous floral character. They gave 5 petals which form a corolla tumble usually twisted or imbricated.

Lathyrus belongs to Fabaceae which have solitary axillary or pedunculate raceme inflorescence, they are bractate pedicellate, complete, bisexual,irregular, zygomorphic, perigynous(sometimes) as its floral characters.

Monadelphous is a phenomenon where the stamens of a flower have joined stalks which results in the form of a tube. Another in the form of only one bag and kidney like structure and hence called monothecous reniform. Contorted fashion of corolla arrangement this arrangement is seen in Hibiscus.

Hence the correct answer is option C.

Note: Hibiscus belongs to the family Malvaceae which have several characters where inflorescence is a solitary axillary. Pedicellate, bracteate, bracteolate in the form of epicalyx, hermaphrodite, complete, actinomorphic, pentamerous, hypogynous as its floral characters monadelphous stamens, monothecous reniform anthers, contorted corollary as given above in the question.