Trifolium owyheense |
Trifolium attenuatum |
|
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Owyhee clover |
Rocky Mountain clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs perennial, 5–30 cm, pubescent. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
erect or ascending, cespitose, branched from base, numerous short stems. |
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 lanceolate, 1.8–2 cm, margins entire, apex acute-acuminate; petiole 2.5–10 cm; petiolules to 0.5 mm; leaflets 3, blades linear, lanceolate, or narrowly elliptic, 1.5–6 × 0.3–1 cm, base cuneate, veins moderately thickened, margins entire, apex acuminate or narrowly acute, surfaces glabrous or pubescent. |
Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
axillary or terminal, 10–20+-flowered, globose, 2.3–3.5 × 2.5–4 cm; involucres formed of proximal bracteoles, bases sometimes connate. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
2–28 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
reflexed in fruit, 2–4 mm; bracteoles ovate, 2–4 mm, truncate or acuminate. |
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. |
15–22 mm; calyx campanulate, 8–15 mm, pubescent, veins 10, tube 2.5–7 mm, lobes unequal, subulate, orifice open; corolla red-purple, 16–20 mm, banner broadly oblong-elliptic, 16–20 × 6–7 mm, apex acute, apiculate. |
Legumes | ellipsoid, 4–5 mm. |
oblong, 5–6 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1–3, brown, ovoid-reniform, 2.5 mm, smooth. |
2n | = 16, 48. |
|
Trifolium owyheense |
Trifolium attenuatum |
|
Phenology | Flowering May–Jun. | Flowering Jun–Aug. |
Habitat | Dry shale hillsides on diatomaceous earth. | Subalpine and alpine slopes, open montane forests. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 3000–3800 m. (9800–12500 ft.) |
Distribution |
ID; OR
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CO; NM
|
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 attenuatum ranges from Park County in Colorado southward through southern and southwestern Colorado to northern and central New Mexico. J. M. Gillett (1965) found both diploid and hexaploid populations of Trifolium attenuatum but was unable to find morphological distinctions between diploid and hexaploid individuals. Using flavonoid chemotaxonomy, E. V. Parups et al. (1966) found close associations between T. attenuatum, T. brandegeei, and T. haydenii. Trifolium lilacinum Rydberg (1901), which pertains here, is a later homonym of T. lilacinum Greene (1896) and thus illegitimate. (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. bracteolatum, T. petraeum, T. stenolobum | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Greene: Pittonia 4: 137. (1900) |
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