Trifolium bifidum |
Trifolium friscanum |
|
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notch-leaf clover, Pinole clover, piñole clover |
Frisco clover |
|
Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, mat-forming, 0.8–3 cm, canescent. |
Stems | erect, branched. |
cespitose, acaulescent. |
Leaves | palmate; stipules ovate to lanceolate, 0.8–1.5 cm, margins entire or slightly serrate, apex acicular; petiole 1–7 cm; petiolules to 0.5 mm; leaflets 3, blades narrowly obcordate, obovate, oblanceolate, or linear, 1–2.5 × 0.3–0.7 cm, base cuneate, veins moderately thickened, margins serrate distally or entire, apex rounded, truncate, shallowly to deeply retuse, or deeply 2-fid, surfaces glabrous or hairy abaxially along midvein. |
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, 5–30-flowered, globose to subglobose, 0.8–1.5 × 0.8–1.5 cm, rachis prolonged beyond flowers; involucres a very narrow rim, to 0.5 mm. |
terminal, 4–9-flowered, globose or depressed-globose, 1–1.5 × 1–2 cm; involucres absent. |
Peduncles | 3–8 cm. |
1–3 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
erect, 0.5 mm; bracteoles absent. |
Flowers | 6–8 mm; calyx campanulate, 3–3.6 mm, slightly hairy or glabrous, veins 10, tube 1–1.5 mm, lobes unequal, subulate, margins green or purple, orifice open; corolla pink or purple, 5–7 mm, banner elliptic to oblong, 5–7 × 3–4 mm, apex rounded, apiculate. |
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 | stipitate, obovoid, 3–4 mm. |
depressed-ellipsoid, 3–4 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1, brown, reniform, 2–2.5 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium bifidum |
Trifolium friscanum |
|
Phenology | Flowering Apr–Jun. | Flowering Jun–Jul. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Volcanic gravel and limestone in pinyon-juniper woodlands. |
Elevation | 0–1200 m. (0–3900 ft.) | 2100–2300 m. (6900–7500 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
|
UT |
Discussion | Trifolium bifidum ranges from Baja California, Mexico, northward through California to scattered sites in Oregon, Washington, and British Columbia. Recent re-evaluation of Trifolium bifidum and related species showed complete overlap in characters for the two varieties that have been recognized previously, with no clear distinctions between them (L. Rogers, pers. comm.). (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. bifidum var. decipiens, T. greenei, T. hallii | T. andersonii var. friscanum |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | (S. L. Welsh) S. L. Welsh: Rhodora 95: 407. (1993) |
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