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FOC | Family List | FOC Vol. 10 | Fabaceae | Trifolium

8. Trifolium dubium Sibthorp, Fl. Oxon. 231. 1794.

钝叶车轴草 dun ye che zhou cao

Annual herbs, glabrous to sparsely pubescent. Stems erect to decumbent, (5-)10-30(-40) cm. Leaves pinnately 3-folio­late; stipules obliquely ovate, 4-8 mm, base rounded, margins finely dentate, apex acute; petiole shorter than or equal to leaf­lets; terminal petiolule longer than lateral petioles; leaflets ob­ovate, 5-10(-12) × 3-8 mm, veins 6-8 pairs, base cuneate, margins entire proximally, obscurely serrulate distally, apex rounded or emarginate. Flowers 5-15, in axillary heads; pedun­cle 0.5-3(-4) cm, pubescent; pedicels less than 1 mm, after flowering pendulous. Calyx ca. 2 mm, veins 5. Corolla pale yel­low, turning brown, 3-4 mm; standard narrowly boat-shaped, smooth, apex acute. Legume oblong, 1.5-2 mm, shortly beaked; stipe ca. 1 mm. Seed 1, pale brown, globose. Fl. and fr. Apr-Sep.

Cultivated, escaped, and naturalized. Jiangsu, Shaanxi, Taiwan [native to SW Asia and Europe].


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