Trifolium owyheense |
Trifolium trichocalyx |
|
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Owyhee clover |
Monterey clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs annual, 5–45 cm, sparsely villous to glabrescent. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
prostrate, decumbent, or erect, 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 ovate, 0.4–1.2 cm, margins serrate-lacerate, apex acuminate; petiole 1–4 cm; petiolules 0.5 mm; leaflets 3, blades obovate, 0.5–1.5 × 0.4–1 cm, base cuneate, veins moderately prominent, margins denticulate, apex truncate, retuse, or mucronulate, surfaces glabrescent. |
Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
axillary or terminal, 2–15-flowered, subglobose, 1.5–1.8 × 0.5–1.5 cm; involucres flattened or vase-shaped, 1–3 mm, when folded, not hiding flowers except proximally, incised 2/3–3/4 their length, lobes 5–15, linear-lanceolate, entire, acuminate. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
1.5–4 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
erect, 1.5 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. |
8–11 mm; calyx campanulate-tubular, not slit between adaxial lobes, 6–9 mm, usually densely pubescent, rarely sparsely so, veins 10, tube 2.5–4.5 mm, lobes unequal, lanceolate-subulate, orifice open; corolla light purple with darker purple keel petals, 6–10 mm, banner narrowly obovate, 4–5 × 1 mm, apex retuse. |
Legumes | ellipsoid, 4–5 mm. |
sessile, oblong, 5 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
3–6(–9), pale brown, mottled purple, globose to mitten-shaped, 0.8–1 mm, smooth to slightly roughened, semiglossy. |
Trifolium owyheense |
Trifolium trichocalyx |
|
Phenology | Flowering May–Jun. | Flowering Apr–May. |
Habitat | Dry shale hillsides on diatomaceous earth. | Sandy, rich soils in open Monterey pine forests, often after fire. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 0–50 m. (0–200 ft.) |
Distribution |
ID; OR
|
CA |
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 trichocalyx is an extremely rare species known only from Mendocino and Monterey counties. D. I. Axelrod (1982) suggested that T. trichocalyx might have originated as a hybrid between T. microcephalum and T. variegatum, but this is not supported by molecular studies (N. W. Ellison et al. 2006). It appears to be fire-adapted and appeared in large numbers shortly after a fire in 1987 (U.S. Fish and Wildlife Service 2004). (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. oliganthum var. trichocalyx | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | A. Heller: Muhlenbergia 1: 55. (1904) |
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