Trifolium willdenovii |
Trifolium owyheense |
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sand clover, thimble clover, tomcat clover, Willdenow's clover |
Owyhee clover |
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Habit | Herbs annual, 10–60 cm, glabrous. | Herbs perennial, 10–20 cm, glaucous, glabrous. |
Stems | erect, branched. |
cespitose, spreading, branched proximally, sparsely branched distally. |
Leaves | palmate; stipules lanceolate or ovate, 1–2 cm, margins dentate or lacerate, apex acuminate; petiole 1–8 cm; petiolules 0.5 mm; leaflets 3, blades linear, lanceolate, or elliptic, 1–5 × 0.2–1.5 cm, base cuneate, veins fine, margins serrate, apex acute, blunt, or retuse, surfaces glabrous. |
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. |
Inflorescences | axillary or terminal, 10–50-flowered, globose or ovoid, 1–3.5 × 1–3 cm; involucres flattened or bowl-shaped, 3–9 mm, when folded, not hiding flowers except proximally, incised 1/4–1/3 their length. |
terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
Peduncles | 2–15 cm. |
3–7 cm, surpassing subtending leaves. |
Pedicels | erect, 0.5 mm; bracteoles absent. |
erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
Flowers | 12–20 mm; calyx tubular-campanulate, slit between adaxial lobes, 6–9 mm, glabrous, veins 10–15, tube 3–7 mm, lobes unequal, triangular or subulate, usually 3-fid or shouldered below apex, orifice open; corolla usually white with purple spot, sometimes lavender or pink or all white, 10–18 mm, banner narrowly oblong, 12–20 × 3–4 mm, apex obtuse or retuse. |
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. |
Legumes | ellipsoid, 3 mm. |
ellipsoid, 4–5 mm. |
Seeds | 1 or 2, yellow, mottled, globose-ellipsoid, 1.5–2.5 mm, smooth. |
1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
2n | = 16. |
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Trifolium willdenovii |
Trifolium owyheense |
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Phenology | Flowering Mar–Jul. | Flowering May–Jun. |
Habitat | Roadsides, meadows, lawns, hillsides, stream margins, open oak chaparral. | Dry shale hillsides on diatomaceous earth. |
Elevation | 0–2500 m. (0–8200 ft.) | 1000–2000 m. (3300–6600 ft.) |
Distribution |
AZ; CA; ID; OR; WA; BC; Mexico (Baja California)
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ID; OR
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Discussion | Trifolium willdenovii was described by M. Zohary and D. Heller (1984) as one of the most variable clover species in North America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | ||
Synonyms | T. involucratum, T. aciculare, T. nuttallii, T. scabrellum, T. segetum, T. tridentatum, T. tridentatum var. aciculare, T. tridentatum var. scabrellum, T. tridentatum var. segetum, T. tridentatum var. watsonii, T. trimorphum, T. watsonii | |
Name authority | Sprengel: Syst. Veg. 3: 208. (1826) | Gilkey: Madroño 13: 169, fig. 1. (1956) |
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