Trifolium vesiculosum |
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arrow-leaf clover |
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Habit | Herbs annual, 15–70 cm, glabrous. |
Stems | erect or ascending, branched. |
Leaves | palmate; stipules linear-lanceolate, 1–3.5 cm, margins entire, apex subulate or setaceous; petiole 0.5–10 cm; petiolules 1 mm; leaflet 3, blades obovate to oblong, elliptic or lanceolate, 0.5–4 × 0.5–1.5 cm, base cuneate, veins prominent, thickened, margins spinulose-denticulate, apex apiculate, surfaces glabrous. |
Inflorescences | terminal or axillary, 50–100+-flowered, globose, ovoid, or oblong, 3–6 × 2–3.5 cm; involucres absent. |
Peduncles | 1–12 cm. |
Pedicels | absent; bracteoles lanceolate, 6–7 mm, acuminate. |
Flowers | 12–16 mm; calyx urceolate, not bilabiate, inflated in fruit, 6–10 mm, glabrous, veins 20–36, connected by transverse veins in fruit, tube 3–5 mm, lobes reflexed, subequal, subulate, as long as tube, orifice constricted; corolla white becoming pink, 12–15 mm, banner ovate, broadly clawed, striate, 12–15 × 2–4 mm, apex acute-acuminate. |
Legumes | ellipsoid, 2.5–2.5 mm, shorter than calyx. |
Seeds | 2 or 3, brown, ovoid, 1–1.5 mm, roughened. |
2n | = 16. |
Trifolium vesiculosum |
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Phenology | Flowering Apr–Jul. |
Habitat | Fields, roadsides, forest openings. |
Elevation | 0–1000 m. (0–3300 ft.) |
Distribution |
AL; AR; CA; FL; GA; LA; MA; MO; MS; OK; OR; SC; TX; VA; WA; s Europe; e Europe; w Asia [Introduced in North America]
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Discussion | Trifolium vesiculosum was first introduced into cultivation in the United States in 1963 and is grown in southern and western states (J. D. Miller and H. D. Wells 1985). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | |
Name authority | Savi: Fl. Pis. 2: 165. (1798) — (as vessiculosum) |
Web links |
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