Trifolium owyheense |
Trifolium monanthum |
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Owyhee clover |
carpet clover, mountain carpet clover |
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Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs perennial, 3–22 cm, glabrous or hairy, often mat-forming. | ||||||||||||
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
decumbent to ascending, much-branched. |
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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 to lanceolate, 0.3–1.2 cm, margins entire, serrate, or slightly lacerate, apex acute to acuminate; petiole 1–4.5 cm; petiolules 0.1–0.5 mm; leaflets 3, blades obovate, oblanceolate, or elliptic, 0.3–2 × 0.2–0.5 cm, base cuneate, veins prominent, margins ± dentate, serrate, or setose, apex acute, rounded, or retuse, surfaces glabrous or slightly villous. |
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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 or terminal, 1–9-flowered, solitary or subglobose, 1–1.6 × 0.3–1.2 cm; involucres campanulate, 2–5 mm, incised nearly to base, lobes 2–8, lanceolate. |
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Peduncles | 3–7 cm, surpassing subtending leaves. |
0.5–2 cm. |
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Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
erect, 1 mm; 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. |
10–16 mm; calyx tubular, 2–10 mm, glabrous or pubescent, veins 10, tube 4–7 mm, lobes equal, triangular-subulate, orifice open; corolla white, pink, or lavender, keel petals usually purple-spotted, 8–16 mm, banner oblong, 8–13 × 2–5 mm, apex emarginate. |
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Legumes | ellipsoid, 4–5 mm. |
oblong, 2–4 mm. |
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Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1 or 2, brown, mottled, mitten-shaped, 1–2 mm, dull. |
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2n | = 16. |
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Trifolium owyheense |
Trifolium monanthum |
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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; nw Mexico
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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 4 (4 in the flora). Morphological intergradation among subspecies of Trifolium monanthum may be indicative of low genetic barriers to crossing. It might be just as plausible to divide T. mononathum into two species instead of four subspecies (J. M. Gillett 1980), with T. monanthum encompassing populations with white rhizomes, and T. multicaule encompassing populations with taproots. Trifolium monanthum often forms dense mats. (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 | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | A. Gray: Proc. Amer. Acad. Arts 6: 523. (1865) | ||||||||||||
Web links |