Trifolium campestre var. campestre

Prostrate, ascending to erect annual herb; stems 5–50 cm long, simple or branching, sparsely hairy to glabrescent. Leaves pinnately trifoliolate, petiolate; leaflets rhombic to oblong-elliptic, 8–16 mm long, 4–8 mm wide, virtually glabrous, finely toothed, apex truncate or retuse; stipules leafy, adnate to petioles for about half their length. Inflorescence many-flowered, axillary, globose, 8–15 mm long, 7–10 mm wide, pedunculate; flowers subsessile. Calyx to c. 3 mm long, white, more or less glabrous, tube campanulate, 5-veined, throat open, teeth unequal, spiny, erect or spreading in fruit, lower 3 teeth at least twice as long as tube, upper teeth very short; corolla 4–6 mm long, yellow, persistent; standard spoon-shaped in fruit, hooded, margin minutely dentate. Pod obloid, 1–2 mm long, included in calyx tube; seed 1, ovoid, c. 1 mm long, yellow.  Flowers mainly Sep.–Jan.