Trifolium bifidum |
Trifolium siskiyouense |
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notch-leaf clover, Pinole clover, piñole clover |
Siskiyou clover |
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Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, 20–50 cm, glabrous; rhizomes elongate, slender, roots tuberous. |
Stems | erect, branched. |
erect, 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, 0.8–1.5 cm, margins entire or slightly lacerate, apex acuminate; petiole 1.6–2.4 cm; petiolules 0.5 mm; leaflets 3, blades obovate, oblanceolate, or elliptic, 0.8–3 × 0.5–0.7 cm, base cuneate, veins fine or thickened distally, margins finely serrulate, apex acute, mucronate, or retuse, surfaces 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. |
usually terminal, sometimes axillary, 30–50-flowered, subglobose, 1.2–1.8 × 1.5–2 cm; involucres shallowly bowl-shaped, 18–22 mm, deeply incised, lobes slender, irregular or bifurcate. |
Peduncles | 3–8 cm. |
2.8–3.4 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
straight, 0.5–0.8 mm; bracteoles linear, 1–2 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. |
10–13 mm; calyx tubular, 0.5–0.6 mm, glabrous, veins 10, tube 2 mm, lobes ± equal, 3–4 mm, orifice open; corolla white to purple, 9–12 mm, banner oblong, 7–12 × 2–3 mm, apex retuse. |
Legumes | stipitate, obovoid, 3–4 mm. |
oblong, 2–4 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
2–4, brown, subglobose or mitten-shaped, 1.5 mm, smooth. |
2n | = 16. |
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Trifolium bifidum |
Trifolium siskiyouense |
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Phenology | Flowering Apr–Jun. | Flowering Jun–Jul. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Wet meadows, grassy hillsides. |
Elevation | 0–1200 m. (0–3900 ft.) | 1000–1500 m. (3300–4900 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
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CA; 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 siskiyouense is known from Shasta and Siskiyou counties, California, and Douglas, Jackson, and Josephine counties, Oregon. It is difficult to distinguish from T. wormskioldii without underground parts showing the tubers, but can be separated from the latter by deeply cut involucral segments, long-lobed, slender calyces, and the combination of long wing petals and short keel petals (J. M. Gillett 1980). (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. wormskioldii var. siskiyouense |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | J. M. Gillett: Canad. J. Bot. 58: 1441. (1980) |
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