Trifolium resupinatum L., it is an annual herb. Stems reach 10-100 cm, mostly furrowed and hollow, ascending or erect, branching from the lower part. The trifoliate leaves have glabrous or hairy petioles; stipules are membranous, ovate-oblong, united below, free portion as long or longer than the united part, those of the upper leaves much shorter. Leaflets are 0.7-1.5 cm long, rhomboidal or ovate-oblong, tapering at the base, spinulose-dentate, apex round-tapering. Peduncles are usually much longer than the leaf. Flower head is axillary, many-flowered, 0.7-1.5 cm across. Flowering calyx lobes are linear-lanceolate, much shorter than the tube, unequal, upper ones much longer. Corolla resupinate, deep pink to purple, fragrant; standard oblong, notched at apex and apiculate in sinus, 6-8 mm long; wings longer than keel and about one-half the length of standard. Fruiting calyces inflated, ovoid or elliptical up to 8 mm long with prominent reticulate venation, diverging from one another. Pods are membranous, lenticular, dehiscing at thickened sutures, one-seeded. Seed are ovoid, brown, about 1.2 mm long.
Flowering in: Feb-May.
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