Trifolium willdenovii |
Trifolium friscanum |
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sand clover, thimble clover, tomcat clover, Willdenow's clover |
Frisco clover |
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Habit | Herbs annual, 10–60 cm, glabrous. | Herbs perennial, mat-forming, 0.8–3 cm, canescent. |
Stems | erect, branched. |
cespitose, acaulescent. |
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 broadly lanceolate, 0.5–0.9 cm, margins entire, apex acute; petiole 0.3–1.5 cm; petiolules to 0.2 mm; leaflets 3, blades oblanceolate to obovate, often folded, 0.3–0.8 × 0.1–0.4 cm, base cuneate, veins thickened, obscured by pubescence, margins entire or toothed distally, apex acute, surfaces densely silvery-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. |
terminal, 4–9-flowered, globose or depressed-globose, 1–1.5 × 1–2 cm; involucres absent. |
Peduncles | 2–15 cm. |
1–3 cm. |
Pedicels | erect, 0.5 mm; bracteoles absent. |
erect, 0.5 mm; 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. |
9–11 mm; calyx campanulate, 8.5–9.5 mm, canescent, veins 5–10 (obscured by hairs), tube 2.5–3 mm, lobes subequal, subulate, orifice open; corolla with magenta banner, pale pink wing and keel petals, 8–10 mm, banner oblong, 8–10 × 2–3 mm, apex acute. |
Legumes | ellipsoid, 3 mm. |
depressed-ellipsoid, 3–4 mm. |
Seeds | 1 or 2, yellow, mottled, globose-ellipsoid, 1.5–2.5 mm, smooth. |
1, brown, reniform, 2–2.5 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium willdenovii |
Trifolium friscanum |
|
Phenology | Flowering Mar–Jul. | Flowering Jun–Jul. |
Habitat | Roadsides, meadows, lawns, hillsides, stream margins, open oak chaparral. | Volcanic gravel and limestone in pinyon-juniper woodlands. |
Elevation | 0–2500 m. (0–8200 ft.) | 2100–2300 m. (6900–7500 ft.) |
Distribution |
AZ; CA; ID; OR; WA; BC; Mexico (Baja California)
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UT |
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 friscanum is a rare species endemic to the Great Basin and is known from only five populations occupying nine sites in Beaver and Millard counties (D. Tilley 2012). (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 | T. andersonii var. friscanum |
Name authority | Sprengel: Syst. Veg. 3: 208. (1826) | (S. L. Welsh) S. L. Welsh: Rhodora 95: 407. (1993) |
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