Question

A plant has an androecium with monadelphous stamens, monothecous and reniform anthers. The corolla exhibits contorted aestivation. The plant could be
A) Rauwolfia
B) Vinca
C) Nerium
D) Hibiscus

Answer 1

Hint: Plant is a genus of flowering plants in the family- Malvaceae.Biological source is Hibiscus syriacus and Hibiscus rosa-sinensis.Kenaf is a specie of Hibiscus which is used in paper making. Hibiscus has an androecium with monadelphous stamens, monothecous and reformed anthers as well its corolla has contorted aestivation.

Complete Answer:
Characteristics of Hibiscus:
- ROOT: Tap root system.
- STEM: Aerial, branched and erect.
- LEAF: leaves are simple, often, lobed and alternate.
- FRUITL: Abortive.
- POLLINATION: Flowers are colored brightly.
- Androecium- Number of stamens, monadelphous, filaments fuses to form a tubular stamina column around gynoecium, anthers reniform, monothecous.
- Corolla: Petals five, polypetalous bust basally adnate with the staminal column, variously colored, twisted aestivation.
- FEATURES- Most members of the family exhibit fibrous stems.
- Flowers: Contorted aestivation.

Additional information:
1) Vinca: It is used in diabetes, hypertension, anticancer and as disinfectant.It is a genus of flowering plant in the family- Apocynaceae.
2) Rauvolfia: It is used in high blood pressure.It is a species of flower in the family- Apocynaceae.

Characters of Apocynaceae
- Root: Tap root.
- Corolla: Petals five, usually twisted, sometimes imbricate, rarely valvated.
- Gynoecium: bicarpellary.
- Androecium: Stamens are 4-5, epipetalous, filaments are short, free, connate to stigma.

3) Nerium: It is used to treat ulcers, leprosy and malignances.It is a shrub or small tree in the family- Apocynaceae. It is considered as a poisonous plant.

Note: Hibiscus is used to treat high blood pressure. It is also used to treat heart and nerve diseases. It is also used as a diuretic to increase urine production. Red Hibiscus flowers are widely used for medicinal purposes.