Trifolium owyheense |
Trifolium macraei |
|
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Owyhee clover |
Chilean clover, Macrae's clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs annual, 3–30 cm, pubescent. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
erect, ascending, or prostrate, 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 to oblong, 0.6–1 cm, margins entire, apex acuminate to cuspidate; petiole 0.5–6 cm; petiolules to 0.5 mm; leaflets 3, blades obovate, oblanceolate, or elliptic, 0.6–1.6 × 0.3–1.2 cm, base cuneate, veins obscure or slightly thickened, margins subentire to serrate, apex rounded, retuse, surfaces pubescent. |
Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
terminal or subterminal, usually paired, sometimes one head slightly stalked, partially hidden by terminal leaves and stipules, 10–40-flowered, ovoid or subglobose, 0.8–2.5 × 0.5–2 cm; involucres absent, involucrelike structure formed from terminal leaves and stipules. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
0–0.2 cm. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
absent; bracteoles broadly ovate to linear, 1–2 mm. |
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. |
5.5–7.5 mm; calyx tubular, 4–5 mm, pubescent, veins 5–10, tube 1.5–2 mm, lobes subequal, subulate, orifice open; corolla usually purple or pink, rarely white, 5–7 mm, banner obovate-oblong, 6–7 × 2–3 mm, apex rounded, slightly denticulate. |
Legumes | ellipsoid, 4–5 mm. |
oblong, 2.5–3 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
1, yellow, mottled, ellipsoid, 1.6–2 mm, smooth. |
2n | = 16. |
|
Trifolium owyheense |
Trifolium macraei |
|
Phenology | Flowering May–Jun. | Flowering May–Jun. |
Habitat | Dry shale hillsides on diatomaceous earth. | Grassy fields, sandy ocean bluffs. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 0–800 m. (0–2600 ft.) |
Distribution |
ID; OR
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CA; OR; South America (Chile)
|
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 macraei was described from specimens collected in Chile; the South American plants have broader banners, smaller auricles on the wing petals, and styles that are barely curved upwards distally (D. Isely 1998). Further examination of the disjunct populations may reveal other differences and prompt reconsideration of the identity of North American specimens. The record from Massachusetts is a waif. (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. bicephalum, T. catalinae, T. mercedense, T. traskiae | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Hooker & Arnott: Bot. Misc. 3: 179. (1833) |
Web links |