Trifolium bifidum |
Trifolium owyheense |
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notch-leaf clover, Pinole clover, piñole clover |
Owyhee clover |
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Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, 10–20 cm, glaucous, glabrous. |
Stems | erect, branched. |
cespitose, spreading, branched proximally, sparsely branched distally. |
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 obovate, 1–2 cm, fused at base, margins slightly lobed, apex acute; petiole 2–6 cm; petiolules 1–1.5 mm; leaflets 3, blades ovate, obovate, or orbiculate, slightly overlapping, 1–2 × 0.7–2.3 cm, base truncate to rounded, veins prominent, margins sparsely dentate, apex rounded, emarginate, 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, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
Peduncles | 3–8 cm. |
3–7 cm, surpassing subtending leaves. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 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. |
15–21 mm; calyx tubular-campanulate, 9–12 mm, pilose, veins 10, tube 4.5–6 mm, lobes subequal, abaxialmost longest, subulate, orifice open; corolla deep pink or magenta, 20–23 mm, banner tubular for most their length, 18–22 × 5–7 mm, apex flared. |
Legumes | stipitate, obovoid, 3–4 mm. |
ellipsoid, 4–5 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
2n | = 16. |
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Trifolium bifidum |
Trifolium owyheense |
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Phenology | Flowering Apr–Jun. | Flowering May–Jun. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Dry shale hillsides on diatomaceous earth. |
Elevation | 0–1200 m. (0–3900 ft.) | 1000–2000 m. (3300–6600 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
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ID; 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 owyheense is known from about 40 populations in a small portion of east-central Malheur County in Oregon, and immediately adjacent Owyhee County in Idaho (M. Mancuso 2001). (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 | |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | Gilkey: Madroño 13: 169, fig. 1. (1956) |
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