Trifolium owyheense |
Trifolium polyodon |
|
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Owyhee clover |
Pacific grove clover, woods or Pacific grove clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs annual, 10–60 cm, glabrous. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
decumbent or ascending, 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 lanceolate to ovate, 0.4–1.8 cm, margins lacerate, apex acute to acuminate; petiole 0.5–6 cm; petiolules to 1 mm; leaflets 3, blades broadly elliptic to broadly obovate, 0.4–2.5 × 0.4–1.5 cm, base cuneate, veins moderately thickened, margins dentate-serrulate, apex rounded or truncate, often retuse, surfaces glabrous. |
Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
axillary, 10–25-flowered, subglobose or globose, 1–1.8 × 1–1.8 cm; involucres flattened or bowl-shaped, 4–7 mm, incised 1/2 their length, when folded, not hiding flowers except proximally, lobes 5–12, dentate-lacerate, spinulose. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
1–2 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
straight, to 1 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. |
8–10 mm; calyx campanulate-tubular, not slit between adaxial lobes, 5–7 mm, glabrous, veins 20, tube 1.9–2.4 mm, lobes unequal, 3-fid or laciniate, often appearing 7+-lobed, orifice open; corolla pink or pale purple, 8–9 mm, banner elliptic, 8–9 × 2–3 mm, apex retuse. |
Legumes | ellipsoid, 4–5 mm. |
ellipsoid, 3.5–4 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
2, dark brown, mottled, ovoid or reniform, 1.7–1.9 mm, smooth. |
Trifolium owyheense |
Trifolium polyodon |
|
Phenology | Flowering May–Jun. | Flowering Apr–Jun. |
Habitat | Dry shale hillsides on diatomaceous earth. | Along streams, moist meadows. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 0–150 m. (0–500 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.) |
The taxonomic status of Trifolium polyodon, known only from Monterey County, has long been debated. W. L. Jepson (1936) considered it a variety of T. tridentatum Lindley (= T. willdenovii). The first to consider it as a variety of T. variegatum was J. S. Martin (1943), who never formally published a new combination; an invalid combination was made by M. Zohary and D. Heller (1984). D. Isely (1998) included it in his interpretation of T. variegatum as phase 5 of that species; he speculated that T. polyodon might have originated as a hybrid of T. variegatum and T. willdenovii. Molecular studies (N. W. Ellison et al. 2006) showed that T. polyodon is closely related to T. variegatum but is distinct; it also appears to be related to T. cyathiferum. (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. tridentatum var. polyodon | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Greene: Pittonia 3: 215. (1897) |
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