Trifolium bifidum |
Trifolium thompsonii |
|
---|---|---|
notch-leaf clover, Pinole clover, piñole clover |
Thompson's clover |
|
Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, 35–50 cm, antrorse-strigose. |
Stems | erect, branched. |
erect, 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, 3–4 cm, margins entire, apex acuminate; petiole 5–20 cm; petiolules to 1 mm; leaflets 5–7, blades linear, linear-elliptic, linear-lanceolate, often folded, falcate, 2–7 × 0.2–0.6 cm, base cuneate, veins thickened, margins setose, apex acute-setiform, surfaces pubescent. |
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. |
terminal, 60-flowered, in 10–12 whorls, globose or ovoid to subglobose, 3–5 × 3–4 cm; involucres absent. |
Peduncles | 3–8 cm. |
10–15 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
reflexed in fruit, 1–1.5 mm; bracteoles minute. |
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. |
20–23 mm; calyx campanulate, 6–8 mm, slightly pilose, veins 10–15, tube 2.5–3 mm, lobes equal, subulate, slightly pilose, orifice open; corolla rose-pink to purple, 18–22 mm, banner oblong, folded, 18–22 × 11–13 mm, apex rounded. |
Legumes | stipitate, obovoid, 3–4 mm. |
flattened, lanceoloid-oblong, 6 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1 or 2, yellow, often mottled, mitten-shaped, 2.8–3 mm, smooth, glossy. |
2n | = 16. |
= 16. |
Trifolium bifidum |
Trifolium thompsonii |
|
Phenology | Flowering Apr–Jun. | Flowering May–Jun. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Dry talus fans at base of slopes. |
Elevation | 0–1200 m. (0–3900 ft.) | 100–300 m. (300–1000 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
|
WA
|
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 thompsonii is known from Chelan and Douglas counties (J. E. Canfield 1977). 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 | Lupinaster thompsonii |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | C. V. Morton: J. Wash. Acad. Sci. 23: 270. (1933) |
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