Trifolium bifidum |
Trifolium barbigerum |
|
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notch-leaf clover, Pinole clover, piñole clover |
bearded clover |
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Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs annual, 7–20 cm, puberulent or glabrous. |
Stems | erect, branched. |
decumbent or erect, branched. |
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 ovate-lanceolate, 0.5–1.1 cm, margins toothed or lacerate, apex acute-acuminate; petiole 1–10 cm; petiolules to 0.5 mm; leaflets 3, blades oblanceolate or obovate, 1.5–2.5 × 0.4–0.7 cm, base cuneate, veins fine, thickened distally, margins ± serrate or entire, apex rounded or retuse, surfaces pubescent or glabrous. |
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. |
axillary or terminal, 5–20-flowered, subglobose or globose, 0.6–1.5 × 1–1.5 cm; involucres bowl-shaped, 5–15 mm, lobes 6–10, sharply setaceous-toothed, sinuses shallow. |
Peduncles | 3–8 cm. |
5–10 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
straight, 0.2 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. |
4–6 mm; calyx campanulate, 5–9 mm, usually pubescent, rarely glabrous, veins 5, tube 2–3 mm, lobes ± equal, setaceous, often exceeding banner, orifice open; corolla usually lavender to purple, usually with white tips, rarely wholly white, 5–8 mm, banner broadly oblong, proximally inflated in fruit, distally narrowed into twisted tip, 6–8 × 6–8 mm, apex broadly acute. |
Legumes | stipitate, obovoid, 3–4 mm. |
ovoid-ellipsoid, 2–3 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1 or 2, brown, ellipsoid to subglobose, 1–1.5 mm, slightly roughened. |
2n | = 16. |
= 16. |
Trifolium bifidum |
Trifolium barbigerum |
|
Phenology | Flowering Apr–Jun. | Flowering Apr–Jun. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Vernal pools, stream banks, meadows, lawns. |
Elevation | 0–1200 m. (0–3900 ft.) | 0–1300 m. (0–4300 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
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CA; OR
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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 barbigerum is relatively common and widespread in California, and extends northward into Coos, Curry, and Jackson counties in Oregon. It is morphologically similar to T. physanthum of Chile, to which it is a sister species in phylogenetic studies (N. W. Ellison et al. 2006). (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. minutissimum |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | Torrey in War Department [U.S.]: Pacif. Railr. Rep. 4(5): 79. (1857) |
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