Herbs annual, 10–30 cm, appressed-pubescent. Stems erect, unbranched to sparsely branched. Leaves palmate; stip­ules lanceolate to linear, 0.5–2.2 cm, margins entire, apex lanceolate-linear; petiole 2–3 cm; petiolules 1+ mm; leaflets 3, blades linear-lanceolate, 3–5 × 0.2–0.4 cm, base cuneate, veins fine, margins entire, apex acute, surfaces hairy. Peduncles 1–2.2 cm. Inflorescences terminal, 25–75-flowered, spicate, cylindric or conic, 3–8 × 1.5–2 cm; involucres absent. Pedicels erect, 0.5 mm; bracteoles absent. Flowers 10–13 mm; calyx tubular, 8–13 mm, tuberculate with appressed, stiff hairs, veins 10, tube 3–5 mm, lobes unequal, abaxial lobes longest, subulate-setaceous, spreading stellate in fruit, orifice closed by bilabiate callosities, hairy; corolla usually pale pink or purple, rarely white, 9–12 mm, banner ovate-elliptic, 9–12 × 2–2.5 mm, apex notched. Legumes ovoid, leathery distally, transversely dehiscent, 2.2–2.5 mm. Seeds 1, light brown or yellow, ovoid, 1.6–2 mm, smooth, glossy. 2n = 14, 16.

Phenology: Flowering Mar–Apr.
Habitat: Waste places, fields, meadows.
Elevation: 0–1000 m.

Distribution

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Introduced; Ala., Calif., Oreg., S.C., Europe, w Asia, n Africa, Atlantic Islands (Canary Islands), introduced also in s South America (Chile, Uruguay), s Africa, Pacific Islands (New Zealand), Australia.

Discussion

Trifolium angustifolium is spreading rapidly in west-central California and is weedy in many regions globally (R. P. Randall 2002).

Selected References

None.

Lower Taxa

None.