Trifolium owyheense |
Trifolium barbigerum |
|
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Owyhee clover |
bearded clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs annual, 7–20 cm, puberulent or glabrous. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
decumbent or erect, branched. |
Leaves | 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. |
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 | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
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 | 3–7 cm, surpassing subtending leaves. |
5–10 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
straight, 0.2 mm; bracteoles absent. |
Flowers | 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. |
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 | ellipsoid, 4–5 mm. |
ovoid-ellipsoid, 2–3 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1 or 2, brown, ellipsoid to subglobose, 1–1.5 mm, slightly roughened. |
2n | = 16. |
|
Trifolium owyheense |
Trifolium barbigerum |
|
Phenology | Flowering May–Jun. | Flowering Apr–Jun. |
Habitat | Dry shale hillsides on diatomaceous earth. | Vernal pools, stream banks, meadows, lawns. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 0–1300 m. (0–4300 ft.) |
Distribution |
ID; OR
|
CA; OR
|
Discussion | 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.) |
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. minutissimum | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Torrey in War Department [U.S.]: Pacif. Railr. Rep. 4(5): 79. (1857) |
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