Trifolium owyheense |
Trifolium dasyphyllum |
|
---|---|---|
Owyhee clover |
alpine clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs perennial, 5–20 cm, appressed-pubescent. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
cespitose, branched, 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-linear, 1.5–2 cm, margins entire, apex acuminate; petiole 0.6–3.5 cm; petiolules to 0.5 mm; leaflets 3, blades oblong-elliptic, oblanceolate, or obovate, sometimes folded, 0.6–3.2 × 0.2–0.6 cm, base cuneate, veins obscure, margins entire, apex acute, surfaces glabrous or hairy. |
Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
axillary or terminal, 5–16-flowered, globose, 1.5–3.5 × 1.2–3.3 cm; involucres formed of proximal bracteoles, bases sometimes connate. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
2–17 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
erect, 1.5–2 mm; bracteoles linear-lanceolate, scarious, 2–6 mm, or scalelike. |
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. |
12–16 mm; calyx campanulate, 6–9 mm, pubescent, veins 10, tube 2–5 mm, lobes unequal, linear-subulate, orifice open; corolla often bicolored cream and violet, sometimes all red-purple or violet, 1.2–1.6 mm, banner broadly elliptic-ovate, 11–15 × 4–5 mm, folded distally, apex rounded, apiculate; ovaries pubescent distally. |
Legumes | ellipsoid, 4–5 mm. |
oblong, 4–6 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1–3, dark brown, ovoid-reniform, 2–2.5 mm, smooth. |
2n | = 16. |
|
Trifolium owyheense |
Trifolium dasyphyllum |
|
Phenology | Flowering May–Jun. | Flowering Jun–Aug. |
Habitat | Dry shale hillsides on diatomaceous earth. | Alpine meadows, rocky slopes. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 2100–4100 m. (6900–13500 ft.) |
Distribution |
ID; OR
|
CO; MT; NM; UT; WY
|
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.) |
Three subspecies of Trifolium dasyphyllum were recognized by J. M. Gillett (1965), but he commented on the overlap in diagnostic characters of the subspecies. In their monograph of Trifolium, M. Zohary and D. Heller (1984) mirrored the treatment by Gillett, and also commented on intermediacy of characters in some specimens. The subspecies were not accepted by R. D. Dorn (1988), citing extensive intergradation, or by R. C. Barneby (1989), citing variability within T. dasyphyllum that is not linked with distribution or other morphological features. Trifolium dasyphyllum is found from eastern Utah and from Santa Fe County in New Mexico northward through central Colorado to central and northwestern Wyoming and Cascade, Gallatin, and Madison counties in Montana. (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. anemophilum, T. dasyphyllum subsp. anemophilum, T. dasyphyllum subsp. uintense, T. dasyphyllum var. uintense, T. lividum, T. scariosum, T. uintense | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Torrey & A. Gray: Fl. N. Amer. 1: 315. (1838) |
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