Trifolium haydenii |
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Hayden's clover |
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Habit | Herbs perennial, 5–10 cm, glabrous. |
Stems | ascending, cespitose, short-branched. |
Leaves | mostly basal, palmate; stipules lanceolate, 0.4–0.8 cm, margins entire or lobed, apex acute or acuminate; petiole 1–6 cm; petiolules to 0.5 mm; leaflets 3, blades broadly ovate, 0.4–2 × 0.3–1.5 cm, base cuneate, veins thickened distally, ± straight, sometimes arching distally, 0.5+ mm apart, 5–10 pairs of primary veins, margins sharply antrorse-serrate, apex acute, short-apiculate, surfaces glabrous. |
Inflorescences | terminal, 5–20-flowered, erect, globose or subglobose, 0.5–1.5 × 0.8–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres a narrow, membranous, dentate rim, 0.5 mm. |
Peduncles | straight distally, proximal to inflorescence, 5–8 cm. |
Pedicels | strongly reflexed, 1.5 mm; bracteoles broadly ovate, truncate, membranous, to 0.5 mm. |
Flowers | 13–17 mm; calyx campanulate, 4.5–6.5 mm, glabrous, veins 10 (5 sometimes faint), tube 2–3 mm, lobes subequal, narrowly triangular-subulate, equaling tube, orifice open; corolla salmon, buff-pink, or pink, with white or cream tips, 13–17 mm, banner broadly elliptic-oblong, 13–17 × 6–8 mm, apex rounded, retuse or slightly apiculate. |
Legumes | stipitate, obovoid-oblong, 6–7 mm. |
Seeds | 1–4, brown, lenticular-ovoid, 2.5–3 mm, smooth. |
2n | = 16. |
Trifolium haydenii |
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Phenology | Flowering Jun–Aug. |
Habitat | Alpine and subalpine slopes. |
Elevation | 2200–3800 m. (7200–12500 ft.) |
Distribution |
ID; MT; WY
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Discussion | Trifolium haydenii, which is found in east-central Idaho, southwestern Montana, and northwestern Wyoming, appears related to T. kingii, T. productum, and similar species (J. M. Gillett 1972) and is sometimes confused with T. latifolium (Gillett 1969), from which it differs by the absence of hairs. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | |
Synonyms | T. idahoense |
Name authority | Porter in F. V. Hayden: Prelim. Rep. U.S. Geol. Surv. Montana, 480. (1872) — (as haydeni) |
Web links |