Identify the stem nodulating legume.

Correct option is B

(b) Sesbania aculeate: • Sesbania is known for forming stem nodules, unlike most legumes which form root nodules. • It is used as a green manure crop, especially in rice fields. • The nodules house Rhizobium species, fixing atmospheric nitrogen.
 (a) Crotalaria juncea: • Fixes nitrogen via root nodules.
 (c) Phaseolus trilobus: • Common bean, root nodulating.
 (d) Medicago sativa: • Known as alfalfa, nodulates roots only.