Trifolium officinalis Linn.
Annual to biennial, erect or decumbent plant, 30-250 cm tall. Leaflets of lower leaves obovate to ovate, the upper ovate-lanceolate, serrate. Stipules of lower leaves entire. Inflorescence a 4-10 cm long raceme, longer than the subtending leaf. Corolla 5-7 mm long, yellow, wing and vexillum equal, longer than the keel. Fruit 3-5 mm long, glabrous, transversely striated, usually 1-seeded.
Type: Described from Europe.
Distribution: Pakistan, Kashmir, India (N. Punjab), Tibet, Russia (Central Asia, Siberia, Caucasus, European Russia), China, Persia, Turkey, Middle and Southern Europe; introduced in America and Tropical Africa.
A weed of cultivated fields and waste places.