Trifolium striatum |
Trifolium andinum |
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knotted clover |
Great Divide clover, intermountain clover |
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Habit | Herbs usually annual, rarely biennial, 10–50 cm, villous. | Herbs perennial, 5–15 cm, pubescent. |
Stems | erect, ascending, or decumbent, branched from base. |
erect or ascending, cespitose, much-branched. |
Leaves | 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. |
palmate; stipules oblanceolate, 0.5–1.4 cm, margins entire, apex acute-acuminate; petiole 0.5–4 cm; petiolules to 0.1 mm; leaflets 3, blades oblanceolate, often folded, 0.4–1.5 × 0.2–0.4 cm, base cuneate, veins obscure, margins subentire to denticulate distally, apex acute, mucronulate, surfaces villous. |
Inflorescences | axillary or terminal, solitary or paired, 20–60-flowered, ovoid or oblong, 0.8–1.6 × 0.6–1 cm; involucres absent. |
terminal, usually formed of 2 sessile heads, 15–25-flowered, globose, 0.8–2 × 0.6–1.5 cm; involucres absent, distal stipules and leaves sometimes forming involucrelike structure. |
Peduncles | 0–1 cm. |
between distal leaves or involucrelike structure and inflorescences 0.5–6 cm. |
Pedicels | absent; bracteoles absent. |
straight, (0–)1–2 mm; bracteoles broadly ovate, truncate, membranous, to 0.5 mm. |
Flowers | 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. |
10–15 mm; calyx tubular-campanulate, 6–9 mm, rough-hairy or glabrous, veins 10, tube 3–6 mm, lobes subequal, subulate, orifice open; corolla light purple, 10–15 mm, banner oblong, 9–13 × 3–4 mm, apex rounded or truncate; ovaries pubescent distally. |
Legumes | ovoid, leathery distally, transversely dehiscent, 2–2.5 mm. |
ellipsoid, 4–5 mm. |
Seeds | 1, tan or reddish brown, globose to ovoid, 1–1.5 mm, smooth, glossy. |
1 or 2, brown, ovoid, 1.5–2 mm, smooth. |
2n | = 14. |
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Trifolium striatum |
Trifolium andinum |
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Phenology | Flowering May–Aug. | Flowering May–Jun. |
Habitat | Waste places | Shale or clay bluffs and hilltops, crevices of volcanic or limestone rock, pinyon-juniper belt. |
Elevation | 0–500 m. (0–1600 ft.) | 1600–2300 m. (5200–7500 ft.) |
Distribution |
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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AZ; CO; NM; NV; UT; WY
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Discussion | 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.) |
Trifolium andinum ranges from central and southern Nevada into west-central Utah, north-central Arizona to southeastern Utah, north-central New Mexico, and northeastern Utah into southwestern Wyoming. Differentiation of T. andinum into subspecific taxa proved impossible, since no consistent gaps in morphological traits could be found. (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. andinum var. canone, T. andinum var. navajoense, T. andinum var. podocephalum, T. andinum var. wahwahense | |
Name authority | Linnaeus: Sp. Pl. 2: 770. (1753) | Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 314. (1838) |
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