Trifolium willdenovii |
Trifolium striatum |
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sand clover, thimble clover, tomcat clover, Willdenow's clover |
knotted clover |
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Habit | Herbs annual, 10–60 cm, glabrous. | Herbs usually annual, rarely biennial, 10–50 cm, villous. |
Stems | erect, branched. |
erect, ascending, or decumbent, branched from base. |
Leaves | palmate; stipules lanceolate or ovate, 1–2 cm, margins dentate or lacerate, apex acuminate; petiole 1–8 cm; petiolules 0.5 mm; leaflets 3, blades linear, lanceolate, or elliptic, 1–5 × 0.2–1.5 cm, base cuneate, veins fine, margins serrate, apex acute, blunt, or retuse, surfaces glabrous. |
palmate; stipules lanceolate-ovate, 0.9–1.1 cm, margins entire, apex acute-acuminate, setaceous, ciliate; petiole 0.5–5 cm; petiolules 0.5 mm; leaflets 3, blades obovate to oblong, 0.9–1.6 × 0.4–1 cm, base cuneate, veins fine, margins denticulate, apex obtuse, obcordate, or emarginate, surfaces hairy. |
Inflorescences | axillary or terminal, 10–50-flowered, globose or ovoid, 1–3.5 × 1–3 cm; involucres flattened or bowl-shaped, 3–9 mm, when folded, not hiding flowers except proximally, incised 1/4–1/3 their length. |
axillary or terminal, solitary or paired, 20–60-flowered, ovoid or oblong, 0.8–1.6 × 0.6–1 cm; involucres absent. |
Peduncles | 2–15 cm. |
0–1 cm. |
Pedicels | erect, 0.5 mm; bracteoles absent. |
absent; bracteoles absent. |
Flowers | 12–20 mm; calyx tubular-campanulate, slit between adaxial lobes, 6–9 mm, glabrous, veins 10–15, tube 3–7 mm, lobes unequal, triangular or subulate, usually 3-fid or shouldered below apex, orifice open; corolla usually white with purple spot, sometimes lavender or pink or all white, 10–18 mm, banner narrowly oblong, 12–20 × 3–4 mm, apex obtuse or retuse. |
5–7 mm; calyx ellipsoid to urceolate, 3–4 mm, hairy, veins 10, tube 2–3 mm, lobes erect or spreading, unequal, abaxial longest and equal to tube, subulate, orifice open; corolla pink, 25–35 mm, banner oblong, 2.5–3.5 × 1.5–2 mm, apex retuse. |
Legumes | ellipsoid, 3 mm. |
ovoid, leathery distally, transversely dehiscent, 2–2.5 mm. |
Seeds | 1 or 2, yellow, mottled, globose-ellipsoid, 1.5–2.5 mm, smooth. |
1, tan or reddish brown, globose to ovoid, 1–1.5 mm, smooth, glossy. |
2n | = 16. |
= 14. |
Trifolium willdenovii |
Trifolium striatum |
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Phenology | Flowering Mar–Jul. | Flowering May–Aug. |
Habitat | Roadsides, meadows, lawns, hillsides, stream margins, open oak chaparral. | Waste places |
Elevation | 0–2500 m. (0–8200 ft.) | 0–500 m. (0–1600 ft.) |
Distribution |
AZ; CA; ID; OR; WA; BC; Mexico (Baja California)
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AL; AR; CA; GA; MA; MO; NC; NJ; NY; OK; OR; PA; SC; VA; VT; WA; BC; Europe; w Asia; nw Africa [Introduced also in s South America (Chile), Pacific Islands (New Zealand), Australia]
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Discussion | Trifolium willdenovii was described by M. Zohary and D. Heller (1984) as one of the most variable clover species in North America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium striatum has been recorded as an occasional weed in the flora area, having been first collected on ballast in New Jersey in 1880. It is found sporadically as a weed of disturbed habitats and appears to be spreading rapidly. It has been called Pitts’s clover in the southern United States because it was discovered by J. D. Pitts in a field of crimson clover as a weed and he experimented with it as a forage plant (G. L. Fuller and B. H. Hendrickson 1928). (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 | ||
Synonyms | T. involucratum, T. aciculare, T. nuttallii, T. scabrellum, T. segetum, T. tridentatum, T. tridentatum var. aciculare, T. tridentatum var. scabrellum, T. tridentatum var. segetum, T. tridentatum var. watsonii, T. trimorphum, T. watsonii | |
Name authority | Sprengel: Syst. Veg. 3: 208. (1826) | Linnaeus: Sp. Pl. 2: 770. (1753) |
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