Trifolium bifidum |
Trifolium haydenii |
|
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notch-leaf clover, Pinole clover, piñole clover |
Hayden's clover |
|
Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, 5–10 cm, glabrous. |
Stems | erect, branched. |
ascending, cespitose, short-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. |
mostly basal, palmate; stipules lanceolate, 0.4–0.8 cm, margins entire or lobed, apex acute or acuminate; petiole 1–6 cm; petiolules to 0.5 mm; leaflets 3, blades broadly ovate, 0.4–2 × 0.3–1.5 cm, base cuneate, veins thickened distally, ± straight, sometimes arching distally, 0.5+ mm apart, 5–10 pairs of primary veins, margins sharply antrorse-serrate, apex acute, short-apiculate, surfaces 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. |
terminal, 5–20-flowered, erect, globose or subglobose, 0.5–1.5 × 0.8–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres a narrow, membranous, dentate rim, 0.5 mm. |
Peduncles | 3–8 cm. |
straight distally, proximal to inflorescence, 5–8 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
strongly reflexed, 1.5 mm; bracteoles broadly ovate, truncate, membranous, to 0.5 mm. |
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. |
13–17 mm; calyx campanulate, 4.5–6.5 mm, glabrous, veins 10 (5 sometimes faint), tube 2–3 mm, lobes subequal, narrowly triangular-subulate, equaling tube, orifice open; corolla salmon, buff-pink, or pink, with white or cream tips, 13–17 mm, banner broadly elliptic-oblong, 13–17 × 6–8 mm, apex rounded, retuse or slightly apiculate. |
Legumes | stipitate, obovoid, 3–4 mm. |
stipitate, obovoid-oblong, 6–7 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1–4, brown, lenticular-ovoid, 2.5–3 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium bifidum |
Trifolium haydenii |
|
Phenology | Flowering Apr–Jun. | Flowering Jun–Aug. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Alpine and subalpine slopes. |
Elevation | 0–1200 m. (0–3900 ft.) | 2200–3800 m. (7200–12500 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
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ID; MT; WY
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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 haydenii, which is found in east-central Idaho, southwestern Montana, and northwestern Wyoming, appears related to T. kingii, T. productum, and similar species (J. M. Gillett 1972) and is sometimes confused with T. latifolium (Gillett 1969), from which it differs by the absence of hairs. (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. idahoense |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | Porter in F. V. Hayden: Prelim. Rep. U.S. Geol. Surv. Montana, 480. (1872) — (as haydeni) |
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