Trifolium bifidum |
Trifolium leibergii |
|
---|---|---|
notch-leaf clover, Pinole clover, piñole clover |
Leiberg's clover |
|
Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, 10–15 cm, canescent. |
Stems | erect, branched. |
erect, aerial stems sparsely branched. |
Leaves | palmate; stipules ovate to lanceolate, 0.8–1.5 cm, margins entire or slightly serrate, apex acicular; petiole 1–7 cm; petiolules to 0.5 mm; leaflets 3, blades narrowly obcordate, obovate, oblanceolate, or linear, 1–2.5 × 0.3–0.7 cm, base cuneate, veins moderately thickened, margins serrate distally or entire, apex rounded, truncate, shallowly to deeply retuse, or deeply 2-fid, surfaces glabrous or hairy abaxially along midvein. |
palmate; stipules lanceolate, 0.7–1.5 cm, margins coarsely spinulose-dentate, apex acuminate; petiole 1–3 cm; petiolules to 0.5 mm; leaflets 3, blades obovate, rhombic, or elliptic, sometimes folded, 0.9–1.5 × 0.5–1.3 cm, base cuneate, veins very thick, margins coarsely spinulose-dentate, apex rounded, long-apiculate, surfaces canescent. |
Inflorescences | axillary or terminal, 5–30-flowered, globose to subglobose, 0.8–1.5 × 0.8–1.5 cm, rachis prolonged beyond flowers; involucres a very narrow rim, to 0.5 mm. |
axillary, 5–25-flowered, globose, 2.2–2.5 × 2.3–2.7 cm; involucres a narrow, papery, irregular rim, to 0.5 mm. |
Peduncles | 3–8 cm. |
2–4.5 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
reflexed in fruit, 1.5–4 mm; bracteoles triangular, to 0.2 mm. |
Flowers | 6–8 mm; calyx campanulate, 3–3.6 mm, slightly hairy or glabrous, veins 10, tube 1–1.5 mm, lobes unequal, subulate, margins green or purple, orifice open; corolla pink or purple, 5–7 mm, banner elliptic to oblong, 5–7 × 3–4 mm, apex rounded, apiculate. |
11–15 mm; calyx campanulate, 5–11 mm, pilose, veins 10, tube 1.8–2.2 mm, lobes subequal, lanceolate-setiform, orifice open; corolla creamy white with purplish veins, becoming pinkish purple-tinged, 10.5–13 mm, banner broadly rhombic-ovate or obovate, 10.5–13 × 5–7 mm, apex rounded, slightly emarginate. |
Legumes | stipitate, obovoid, 3–4 mm. |
ovoid, 3–4 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1 or 2, brown, mitten-shaped, 1.5–2 mm, smooth. |
2n | = 16. |
|
Trifolium bifidum |
Trifolium leibergii |
|
Phenology | Flowering Apr–Jun. | Flowering Jun–Jul. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Open, rocky slopes and crests, ash-flows. |
Elevation | 0–1200 m. (0–3900 ft.) | 1900–2400 m. (6200–7900 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
|
NV; OR |
Discussion | Trifolium bifidum ranges from Baja California, Mexico, northward through California to scattered sites in Oregon, Washington, and British Columbia. Recent re-evaluation of Trifolium bifidum and related species showed complete overlap in characters for the two varieties that have been recognized previously, with no clear distinctions between them (L. Rogers, pers. comm.). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium leibergii is known from only a few populations from Harney County, Oregon, and Elko County, Nevada. It is in the Center for Plant Conservation’s National Collection of Endangered Plants. (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. bifidum var. decipiens, T. greenei, T. hallii | |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | A. Nelson & J. F. Macbride: Bot. Gaz. 65: 58. (1918) |
Web links |
|