Trifolium vesiculosum |
Trifolium glomeratum |
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arrow-leaf clover |
cluster clover |
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Habit | Herbs annual, 15–70 cm, glabrous. | Herbs annual, 10–30 cm, glabrous. |
Stems | erect or ascending, branched. |
procumbent, decumbent, 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. |
palmate; stipules ovate, 1–1.5 cm, margins entire, apex subulate-setaceous; petiole 0–7 cm; petiolules to 0.5 mm; leaflets 3, blades obovate or obcordate, 0.6–1.5 × 0.4–1 cm, base cuneate, veins thickened distally, margins spinulose-serrate, apex retuse or rounded, surfaces glabrous. |
Inflorescences | terminal or axillary, 50–100+-flowered, globose, ovoid, or oblong, 3–6 × 2–3.5 cm; involucres absent. |
axillary, 30+-flowered, globose, 0.8–1 × 0.8–1 cm; involucres absent. |
Peduncles | 1–12 cm. |
absent or to 0.1 cm. |
Pedicels | absent; bracteoles lanceolate, 6–7 mm, acuminate. |
straight, to 0.2 mm; bracteoles linear, to 0.5 mm. |
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. |
6–8.5 mm; calyx tubular-obconic, 3–4 mm, glabrous, veins 10–12, tube 1.5–2 mm, lobes equal, triangular-ovate, spreading to recurved in fruit, orifice open; corolla pink, 6–8 mm, banner obovate, 6–8 × 1–2 mm, apex acute. |
Legumes | ellipsoid, 2.5–2.5 mm, shorter than calyx. |
obovoid, 2–3 mm. |
Seeds | 2 or 3, brown, ovoid, 1–1.5 mm, roughened. |
2, brown, reniform, 1 mm, tuberculate. |
2n | = 16. |
= 14, 16. |
Trifolium vesiculosum |
Trifolium glomeratum |
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Phenology | Flowering Apr–Jul. | Flowering May–Jun. |
Habitat | Fields, roadsides, forest openings. | Roadsides, lawns, thin grasslands. |
Elevation | 0–1000 m. (0–3300 ft.) | 0–500 m. (0–1600 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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AL; CA; OR; SC; TX; BC; Europe; n Africa [Introduced in North America; introduced also in s South America, s Africa, Pacific Islands (New Zealand), Australia]
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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.) |
Trifolium glomeratum is cultivated occasionally as a forage crop (F. J. Hermann 1953) and sometimes spreads. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | ||
Name authority | Savi: Fl. Pis. 2: 165. (1798) — (as vessiculosum) | Linnaeus: Sp. Pl. 2: 770. (1753) |
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