Trifolium haydenii |
Trifolium retusum |
|
---|---|---|
Hayden's clover |
teasel clover |
|
Habit | Herbs perennial, 5–10 cm, glabrous. | Herbs annual, 15–40 cm, glabrous. |
Stems | ascending, cespitose, short-branched. |
erect or ascending, 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. |
palmate; stipules triangular-lanceolate, 0.7–1.5 cm, margins entire, apex stramineous, subulate; petiole 1.5–5 cm; petiolules 1 mm; leaflets 3, blades obovate, oblong, or elliptic, 0.8–1.8 × 0.4–0.9 cm, base cuneate, veins prominent, margins dentate-spinulose, apex rounded to emarginate, 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. |
axillary, 15–30-flowered, globose, 0.8–1 × 0.8–1 cm; involucres absent. |
Peduncles | straight distally, proximal to inflorescence, 5–8 cm. |
0.5–2 cm. |
Pedicels | strongly reflexed, 1.5 mm; bracteoles broadly ovate, truncate, membranous, to 0.5 mm. |
recurved in fruit, 1 mm; bracteoles folded, linear-subulate, 4–5 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. |
4–5 mm; calyx obconic, 4–5 mm, glabrous, veins 10, tube 1.3–2.1 mm, lobes unequal, longer than tube, subulate, recurved in fruit, orifice open; corolla white or pink, 3.2–4.5 mm, banner ovate, 3–4 × 1–2 mm, apex acute to rounded, entire to slightly erose distally. |
Legumes | stipitate, obovoid-oblong, 6–7 mm. |
ovoid-oblong, 4.2–5.5 mm. |
Seeds | 1–4, brown, lenticular-ovoid, 2.5–3 mm, smooth. |
2, brown, ovoid-reniform, 1 mm, minutely granulose. |
2n | = 16. |
= 16. |
Trifolium haydenii |
Trifolium retusum |
|
Phenology | Flowering Jun–Aug. | Flowering Apr–Jun. |
Habitat | Alpine and subalpine slopes. | Roadsides, lawns. |
Elevation | 2200–3800 m. (7200–12500 ft.) | 100–800 m. (300–2600 ft.) |
Distribution |
ID; MT; WY
|
CA; OR; WA; s Europe; w Asia; introduced also in s Africa; Pacific Islands (New Zealand); Australia [Introduced in North America] |
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.) |
Trifolium retusum is a very recent introduction in the flora area; it is known from relatively few counties in the Pacific Coast states. (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. idahoense | |
Name authority | Porter in F. V. Hayden: Prelim. Rep. U.S. Geol. Surv. Montana, 480. (1872) — (as haydeni) | Linnaeus: Demonstr. Pl., 21. (1753) |
Web links |
|