Trifolium lappaceum L., it is an erect or ascending, bright-green coloured annual herb, glabrescent or hirsute, up to 30 (-40) cm long. Stipules oblong, free portion lanceolate-subulate, membranous between the green nerves. Leaflets obovate, rounded or truncate, 5-15 x 3-8 mm, very shortly denticulate. Heads globose to ovoid, many-flowered, at length 10-14 mm in diam., becoming spinescent in fruit, pedunculate. Calyx 6-7 mm long, tube campanulate or obconical, 20-nerved; teeth as long or longer than tube, almost equal, setaceous with triangular bases, becoming indurated in fruit, calyx throat open. Corolla as long as or a little longer than calyx, white or pink. Pods membranous with a leathery operculum, ovoid, long beaked. 1-seeded. Seed ovoid, c. 1.3 mm, brownish. shiny.
Flowering in: Mar-May.
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