Trifolium bifidum |
Trifolium jokerstii |
|
---|---|---|
notch-leaf clover, Pinole clover, piñole clover |
Butte County golden clover, Jim's clover |
|
Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs annual, 5–20 cm, glabrous. |
Stems | erect, branched. |
erect-ascending, simple or cespitose, branched or unbranched. |
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 ovate-lanceolate, 0.8–2 cm, margins toothed, apex rounded to acute; petiole 1–9 cm; petiolules 0.5 mm; leaflets 3, blades elliptic to obovate, 0.5–3.2 × 0.4–1.5 cm, base cuneate, veins fine to slightly thickened, margins usually serrulate, rarely nearly lobed, teeth shortly aristate, apex usually acute or obtuse, rarely emarginate, 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. |
axillary or terminal, 10–30-flowered, subglobose, 1.2–3 × 1.2–3 cm; involucres widely campanulate to nearly flat, 6–11 mm. |
Peduncles | 3–8 cm. |
2–15 cm. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
straight, 0.5 mm; bracteoles absent. |
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. |
10–16 mm; calyx campanulate, inflated in fruit, 7–9 mm, sparsely pubescent, veins 5, tube 3.5–4.5 mm, lobes unequal, abaxial and lateral 2- or 3-fid, adaxial unbranched, segments plumose, apex setaceous, orifice open; corolla yellow, 10–15 mm, banner broadly ovate, proximally inflated in fruit, distally narrowed into twisted tip, 10–15 × 3–5 mm, apex obtuse, truncate, or emarginate-apiculate. |
Legumes | stipitate, obovoid, 3–4 mm. |
stipitate, ovoid, 3.3–3.5 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1 or 2, dark brown, ellipsoid to mitten-shaped, 3.1–3.4 mm, rugose. |
2n | = 16. |
|
Trifolium bifidum |
Trifolium jokerstii |
|
Phenology | Flowering Apr–Jun. | Flowering Mar–May. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Wet meadows, streamsides. |
Elevation | 0–1200 m. (0–3900 ft.) | 300–400 m. (1000–1300 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
|
CA |
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 jokerstii is known only from Butte County, from Table Mountain and along a stream adjacent to it (M. A. Vincent and R. Morgan 1998). (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) | Vincent & Rand. Morgan: Novon 8: 91, fig. 1. (1998) |
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