Trifolium bifidum |
Trifolium rollinsii |
|
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notch-leaf clover, Pinole clover, piñole clover |
Rollins' clover |
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Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, 5–20 cm, glabrous. |
Stems | erect, branched. |
ascending, cespitose, 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. |
mostly basal, palmate; stipules ovate, 1 cm, margins entire, apex blunt; petiole 2–6 cm; petiolules to 1 mm; leaflets 3, blades obovate or rhombic, 0.6–1.3 × 0.6–1 cm, base cuneate, veins prominent, margins denticulate, apex rounded or retuse, apiculate, surfaces pale abaxially, glabrous. |
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 or axillary, 8–15-flowered, appearing turned to one side, obconic, 1.3–1.8 × 1.1–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres absent. |
Peduncles | 3–8 cm. |
curved distally proximal to flowers, 3–9 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
reflexed, 1–1.2 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. |
10–13 mm; calyx purple, campanulate, 5–6 mm, glabrous, veins 10, tube 3.5 mm, lobes equal, subulate, 2 mm, orifice open; corolla purple, often with white tips, 15 mm, banner obovate, 11–13 × 5–6 mm, apex flared. |
Legumes | stipitate, obovoid, 3–4 mm. |
not seen. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
not seen. |
2n | = 16. |
|
Trifolium bifidum |
Trifolium rollinsii |
|
Phenology | Flowering Apr–Jun. | Flowering Jun–Aug. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Wind-swept alpine areas. |
Elevation | 0–1200 m. (0–3900 ft.) | 3000–3100 m. (9800–10200 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
|
NV |
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 rollinsii is known from the Toiyabe Range in Lander and Nye counties in central Nevada. (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 | T. kingii subsp. rollinsii, T. macilentum var. rollinsii |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | J. M. Gillett: Madroño 21: 453, fig. 2. (1972) |
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