Trifolium nigrescens Viv., it is an annual herb, prostrate to almost erect, glabrous, up to 60 cm long. Leaves (except the uppermost) long, petioled; leaflets 5-25 mm long, obovate to rhombic, sharply denticulate; stipules membranous, triangular-lanceolate cuspidate. Peduncles longer than subtending leaves. Flowering head 10-20 mm in diam., many-flowered; bracts minute or absent. Flowers pink to while, sometimes becoming brownish-black, 5-8 mm long; pedicels at least as long as calyx-tube. Calyx 3-5 mm, while, 5-10-nerved; teeth unequal, shorter or longer than tube, with or without cuspidate tip, recurved in fruit. Standard longer than wings and keel. Pods linear, shallowly to conspicuously constricted between the seeds, 1-4 (-6)-seeded. Seeds ovoid, dark-brown.
Flowering in: Mar-Apr.
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