Trifolium owyheense |
Trifolium albopurpureum |
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Owyhee clover |
Indian clover, rancheria clover |
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Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs annual, 5–40 cm, pubescent. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
erect, branched from base. |
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 elliptic-ovate, 0.6–1 cm, margins entire, toothed, or remotely lobed, ciliate, apex acuminate; petiole 0.5–7 cm; petiolules 1 mm; leaflets 3, blades obovate or elliptic, 0.5–2 × 0.2–1 cm, base cuneate, veins obscure or slightly thickened, margins serrate, apex acute or obtuse, often retuse, surfaces 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, 25–50-flowered, ovoid-ellipsoid, 1–1.8 × 0.8–1.5 cm; involucres absent. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
0.5–10 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
absent; 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. |
6–9 mm; calyx campanulate, 6–8 mm, densely pubescent, veins 10 (additional faint veins sometimes present), tube 1–2 mm, lobes unequal, narrowly triangular, subulate, sinuses rounded, lobes divergent, orifice open; corolla white with purple tips, 4–6 mm, banner narrowly elliptic, 6–7 × 2 mm, apex acute, slightly erose. |
Legumes | ellipsoid, 4–5 mm. |
broadly ellipsoid, 2.8–3.2 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1 (or 2), yellow or brown, often red-mottled, ellipsoid, 2–2.6 mm, smooth, glossy. |
2n | = 16. |
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Trifolium owyheense |
Trifolium albopurpureum |
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Phenology | Flowering May–Jun. | Flowering Apr–May. |
Habitat | Dry shale hillsides on diatomaceous earth. | Grassy foothills and valleys. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 0–2100 m. (0–6900 ft.) |
Distribution |
ID; OR
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AZ; CA; OR; WA; Mexico (Baja California)
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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.) |
Trifolium albopurpureum is a widespread member of a closely allied group of species, including T. amoenum, T. dichotomum, and T. columbinum, that intergrade to varying degrees and may co-occur in some populations. The great similarity among these species has led to a maddening array of synonyms as new suites of species have been recognized and various new combinations have been made. In spite of the resultant confusion, these species are relatively distinct and are differentiated on the following characters: inflorescences generally greater than 3 cm diam. (T. amoenum) versus less than 2.5 cm diam. in the others; corollas usually 8–12 mm with calyx lobes 2–3 times the tube (T. dichotomum), versus corollas usually 5–8.5 mm with calyx lobes 3–6 times the tube; calyces 8–12+ mm with lobes exceeding the corollas by 3–6 mm (T. columbinum), versus calyces 4–9 mm with lobes equaling the corollas or exceeding them by 1.5–2 mm (D. Isely 1998; M. A. Vincent and Isely 2012). Trifolium albopurpureum is widespread in California, northward through Oregon in coastal counties, and with scattered populations known from Washington and Arizona. (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. albopurpureum var. neolagopus, T. helleri, T. macraei var. albopurpureum, T. neolagopus, T. pseudoalbopurpureum | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Torrey & A. Gray: Fl. N. Amer. 1: 313. (1838) |
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