Trifolium douglasii |
Trifolium friscanum |
|
---|---|---|
Douglas' clover |
Frisco clover |
|
Habit | Herbs perennial, 20–75 cm, glabrous or slightly pilose. | Herbs perennial, mat-forming, 0.8–3 cm, canescent. |
Stems | erect, unbranched or sparsely branched. |
cespitose, acaulescent. |
Leaves | palmate; stipules lanceolate to ovate, 1.5–6.5 cm, margins setose-serrulate or entire, apex acuminate; petiole 1.5–15 cm; petiolules 1 mm; leaflets 3, blades elliptic-oblanceolate to linear-elliptic, 3–9.5 × 0.5–1.6 cm, base cuneate, lateral veins prominent, recurved, dichotomously forked near margin, margins setose-denticulate to serrate, apex rounded or acute, surfaces glaucous, glabrous, sometimes sparsely pubescent abaxially. |
palmate; stipules broadly lanceolate, 0.5–0.9 cm, margins entire, apex acute; petiole 0.3–1.5 cm; petiolules to 0.2 mm; leaflets 3, blades oblanceolate to obovate, often folded, 0.3–0.8 × 0.1–0.4 cm, base cuneate, veins thickened, obscured by pubescence, margins entire or toothed distally, apex acute, surfaces densely silvery-hairy. |
Inflorescences | terminal or axillary, 30–50+-flowered, umbellate, globose to ovoid, 1.5–5 × 2–3.5 cm; involucres absent. |
terminal, 4–9-flowered, globose or depressed-globose, 1–1.5 × 1–2 cm; involucres absent. |
Peduncles | 3–12 cm. |
1–3 cm. |
Pedicels | erect or slightly reflexed, to 0.2 mm; bracteoles minute. |
erect, 0.5 mm; bracteoles absent. |
Flowers | 14–16 mm; calyx campanulate, 6–9 mm, pilose, veins 15–20, tube 1.5–3 mm, lobes unequal, narrow, triangular or subulate, abaxial lobe straight, lateral and adaxial tortuous, recurved inwards around corolla, orifice open; corolla magenta, 12–16 mm, banner oblong, 12–16 × 4–6 mm, apex flared, acute or obtuse; ovaries glabrous or pubescent distally. |
9–11 mm; calyx campanulate, 8.5–9.5 mm, canescent, veins 5–10 (obscured by hairs), tube 2.5–3 mm, lobes subequal, subulate, orifice open; corolla with magenta banner, pale pink wing and keel petals, 8–10 mm, banner oblong, 8–10 × 2–3 mm, apex acute. |
Legumes | ovoid, 3–4.5 mm. |
depressed-ellipsoid, 3–4 mm. |
Seeds | 1 or 2, tan to brown, ovoid, 1–1.5 mm, slightly roughened. |
1, brown, reniform, 2–2.5 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium douglasii |
Trifolium friscanum |
|
Phenology | Flowering Jun–Jul. | Flowering Jun–Jul. |
Habitat | Moist meadows, rich soils in prairies, stream bottoms and banks, openings in pine forests. | Volcanic gravel and limestone in pinyon-juniper woodlands. |
Elevation | 600–1500 m. (2000–4900 ft.) | 2100–2300 m. (6900–7500 ft.) |
Distribution |
ID; OR; WA
|
UT |
Discussion | Trifolium douglasii is rare throughout its range and has been impacted by agricultural practices (P. Camp et al. 2011). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium friscanum is a rare species endemic to the Great Basin and is known from only five populations occupying nine sites in Beaver and Millard counties (D. Tilley 2012). (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. altissimum | T. andersonii var. friscanum |
Name authority | House: Bot. Gaz. 41: 335. (1906) | (S. L. Welsh) S. L. Welsh: Rhodora 95: 407. (1993) |
Web links |