Trifolium owyheense |
Trifolium andersonii |
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Owyhee clover |
Anderson's clover, fiveleaf clover |
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Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs perennial, 5–12 cm, canescent. | ||||||||
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
erect-ascending, cespitose, mat-forming, branched; from deep taproot-like crown. |
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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 or lanceolate, 0.5–1.5 cm, margins entire, apex long-acuminate; petiole 1–5 cm; petiolules to 0.5 mm; leaflets (3–)5, blades obovate, 0.5–2.2 × 0.2–1.2 cm, base cuneate, veins obscured by pubescence, margins entire, apex rounded or acute, apiculate, surfaces canescent. |
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Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
axillary, 10–20-flowered, depressed-globose, 1–2 × 1–2.3 cm; involucres formed of connate, narrow, membranous bracts, to 0.5 mm. |
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Peduncles | 3–7 cm, surpassing subtending leaves. |
1–14 cm. |
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Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
absent; bracteoles absent. |
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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. |
10–17 mm; calyx campanulate, 9–11 mm, pilose, veins 10, tube 4–5 mm, lobes equal, subulate, plumose, orifice open; corolla white or pink, 10–17 mm, banner ovate-oblong, 12–19 × 3–5 mm, apex rounded, retuse. |
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Legumes | ellipsoid, 4–5 mm. |
ellipsoid, 4–5 mm. |
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Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1 (or 2), tan or brown, irregularly ovoid, 1.6–2 mm, smooth, glossy. |
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Trifolium owyheense |
Trifolium andersonii |
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Phenology | Flowering May–Jun. | |||||||||
Habitat | Dry shale hillsides on diatomaceous earth. | |||||||||
Elevation | 1000–2000 m. (3300–6600 ft.) | |||||||||
Distribution |
ID; OR
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w United States
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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.) |
Subspecies 3 (3 in the flora). Trifolium andersonii encompasses three moderately well separable subspecies, with subsp. andersonii the more northern form in the range of the species, subsp. monoense in the southwestern portion of the range, and subsp. beatleyae in the eastern portion of the range (J. M. Gillett 1972). Intermediates between the latter two (and overlap in their ranges) make differentiation between them somewhat problematic, which prompted R. C. Barneby (1989) to combine them as var. beatleyae. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium | ||||||||
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Subordinate taxa | ||||||||||
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | A. Gray: Proc. Amer. Acad. Arts 6: 522. (1865) | ||||||||
Web links |