Trifolium bifidum |
Trifolium barnebyi |
|
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notch-leaf clover, Pinole clover, piñole clover |
Barneby's clover |
|
Habit | Herbs annual, 5–55 cm, sparsely pubescent or glabrous. | Herbs perennial, 3–5 cm, mostly glabrous. |
Stems | erect, branched. |
densely mat-forming, short-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 ovate or lanceolate, 0.5–1 cm, margins entire or lobed, apex acute or acuminate; petiole 0.3–30 cm, pubescent; petiolules 0.2 mm; leaflets 3, blades oblanceolate, 0.3–1.6 × 0.1–0.7 cm, base cuneate, veins close-set, 12–18 pairs of primary veins, 0.5 mm apart, margins sharply antrorsely serrate, apex acute, long-apiculate, surfaces usually glabrous, rarely midvein pubescent abaxially. |
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, 8–18-flowered, globose or subglobose, 1.2–2.5 × 2–3 cm; involucres absent. |
Peduncles | 3–8 cm. |
0.5–3.5 cm, pubescent. |
Pedicels | reflexed in fruit, 1–3 mm; bracteoles broadly triangular, membranous, to 0.5 mm. |
reflexed, 2–3.5 mm, pubescent; bracteoles broad, membranous, 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. |
8–13 mm; calyx campanulate, 4–6 mm, pubescent, veins 5–10, tube 1.5–2.5 mm, lobes subequal, narrowly triangular-subulate, orifice open; corolla creamy white, 8–13 mm, banner broadly elliptic-oblong, 10–13 × 6–8 mm, apex rounded, slightly apiculate. |
Legumes | stipitate, obovoid, 3–4 mm. |
stipitate, flattened, ovoid, 2–3.5 mm. |
Seeds | 1 or 2, brown, mottled, oblong, 2–3 mm, smooth. |
1, yellow, mottled, flattened-ovoid, 2 mm, smooth. |
2n | = 16. |
|
Trifolium bifidum |
Trifolium barnebyi |
|
Phenology | Flowering Apr–Jun. | Flowering Jun. |
Habitat | Open woodlands, fields, roadsides, slopes, stream margins, meadows. | Sandstone ledges and outcrops. |
Elevation | 0–1200 m. (0–3900 ft.) | 1700–2100 m. (5600–6900 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California)
|
WY |
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 barnebyi is known from central Wyoming. It was originally described as a variety of T. haydenii, but was elevated to species rank based on its pubescent petioles, pedicels, and peduncles, closely spaced leaflet veins, and more elongate leaflets that are two times as long as wide. (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. haydenii var. barnebyi |
Name authority | A. Gray: Proc. Calif. Acad. Sci. 3: 102. (1864) | (Isely) Dorn & Lichvar: Madroño 28: 189. (1981) |
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