Medicago lupulina L., it is a short-lived annual or perennial herb, more or less pubescent, branched from the base. Stems 5-60(-80) cm long, prostrate to decumbent, greatly expanded. Leaflets broadly obovate or obcuneate, notched and mucronate at the apex with the margin denticulate. Stipules from lanceolate to ovate, serrated or entire. Very floriferous racemes (10-50 flowers), short, compact, longer than the underlying leaf. Flowers very small (2.5-3.5 mm long), short pedicellate. Corolla 2-3 mm long, lemon yellow, wings shorter than keel. Pods 1.5-3 mm long, coiled, oval to reniform, dark ashy in color when ripe, always with one seed; veins prominent, ±curved, branched, arising obliquely from the ventral suture. Seeds 1.7-2 x 1-1.3 x 1-1.1 mm, oval to reniform, compressed, with the apex of the radicle protruding, matte, smooth, greenish yellow to greenish ocher or orange. Thread c. 0.15 mm long, from round to oval. Barely discernible lens almost attached to the thread.
Flowering in: May-Jun.
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