Trifolium owyheense |
Trifolium medium |
|
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Owyhee clover |
trèfle flexueux, zigzag clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs perennial, 20–70 cm, strigose. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
erect-ascending, flexuous, often zigzag, branched. |
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-linear, 1.8–2.8 cm, margins entire, ciliate, apex subulate; petiole 1–9 cm; petiolules 1 mm; leaflets 3, blades elliptic-oblong, obovate, or ovate, 1.5–5 × 0.8–3.5 cm, base cuneate, veins arcuate, forked, margins entire, finely ciliate, apex obtuse to acute, surfaces appressed-pubescent. |
Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
terminal or axillary, rarely paired, 20–50-flowered, globose or ovoid, 1.5–4 × 1.3–3.8 cm; involucres absent. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
1–3 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
straight, 0.5 mm; 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. |
15–18 mm; calyx cylindric, 6–10 mm, glabrous, veins 10–15, tube 2.5–3.5 mm, lobes unequal, subulate-setaceous, orifice glabrous or hairy distally, closed; corolla usually reddish purple, rarely white, 12–20 mm, banner lanceolate-elliptic, 1.2–2 × 4–5 mm, apex acute. |
Legumes | ellipsoid, 4–5 mm. |
ovoid to globose, leathery distally, transversely dehiscent, 2–3 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1 or 2, yellow-brown, mitten-shaped, 1–1.5 mm, smooth, lustrous. |
2n | = 48, 64, 68, 70, 72, 80, ca. 126. |
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Trifolium owyheense |
Trifolium medium |
|
Phenology | Flowering May–Jun. | Flowering May–Aug. |
Habitat | Dry shale hillsides on diatomaceous earth. | Fields, roadsides. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 0–300 m. (0–1000 ft.) |
Distribution |
ID; OR
|
MA; MD; ME; MI; NJ; NY; RI; NB; ON; QC; Europe; w Asia [Introduced in North America; introduced also in e Asia (e China), Pacific Islands (New Zealand), Australia] |
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 medium was reported for Kentucky by H. Garman (1902); no non-cultivated specimens have been seen for that state (M. A. Vincent 2001). Reports of T. medium in Nova Scotia and Prince Edward Island are based on old reports and the species does not appear to be extant in those regions. (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 | ||
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Linnaeus: Amoen. Acad. 4: 105. (1759) |
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