Which one of the following plants shows vexillary aestivation and diadelphous stamens?
- Colchicum autumnale
- Pisum sativum
- Allium cepa
- Solanum nigrum
Answer
(2) Pisum sativum
Solution
Vexillary (papilionaceous) aestivation – a large standard petal overlaps two wings, which overlap two keel petals; diadelphous stamens – stamens united in two bundles (9 + 1).
Both are features of family Fabaceae; as per NCERT, pea ( Pisum sativum) is the example of vexillary aestivation.
∵ Colchicum autumnale and Allium cepa belong to Liliaceae, Solanum nigrum to Solanaceae.
Answer: (2)