Acmispon denticulatus |
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meadow birds-foot trefoil, meadow lotus, Mohave trefoil, riverbar bird's-foot-trefoil, riverbar lotus, riverbar trefoil, tooth lotus |
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Habit | Herbs, annual, cespitose, often glaucous, 0.3–4 dm, not fleshy, glabrous or hirsute; taprooted. |
Stems | 1(–5), decumbent to erect, apically or basally coarse-branched, herbaceous, leafy. |
Leaves | subpinnate, pinnate, or palmate; stipules glandlike or absent; petiolate; rachis 5–12 mm, flattened; leaflets 2–4, often 1 or 2 on one side and 2 terminal, blades elliptic to obovate (lateral sometimes asymmetric), margins denticulate or entire, apex acute to obtuse, surfaces hirsute. |
Inflorescences | 1 or 2-flowered. |
Peduncles | ± sessile; bract absent. |
Flowers | 5–8 mm; calyx 3–5 mm, tube hirsute or glabrous, lobes subulate, ± denticulate; corolla cream-white to pale yellow, banner purple-tinged, keel tip yellowish, claws shorter to slightly longer than calyx tube, banner ascending, wings ± equaling keel, with deep, triangular auricle; style curved, glabrous. |
Legumes | persistent, solitary or paired, exserted, erect or spreading, tawny, straight, compressed, slightly constricted, not septate, widely oblong, 8–20 × 3 mm, leathery, apex abruptly downward angled and curved, dehiscent, smooth, margins often undulate-verrucose, strigose or glabrous. |
Seeds | (2 or)3(or 4), gray, faintly mottled, asymmetrically ± angular-obovoid, flattened, smooth. |
2n | = 12. |
Acmispon denticulatus |
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Phenology | Flowering spring–summer. |
Habitat | Grassy slopes, meadows, prairies, clearings, gravel bars, stream banks, vernal pools, pastures, grainfields, usually sandy soils, sometimes alkali, clay, or serpentine soils, roadsides. |
Elevation | 0–1900 m. (0–6200 ft.) |
Distribution |
CA; ID; OR; UT; WA; BC
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Discussion | Acmispon denticulatus occurs in California from the San Francisco Bay area, Sacramento Valley, and northern Sierra Nevada Foothills to the northwest, Cascade Range and Modoc Plateau, into adjacent southern Oregon (Siskiyou and Klamath regions), northward on both sides of the Cascade Range into southern British Columbia, with eastern outliers in southwestern Utah (Washington County), and in south-central Idaho (Lincoln County). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Acmispon |
Sibling taxa | |
Synonyms | Hosackia denticulata, Anisolotus denticulatus, Lotus denticulatus |
Name authority | (Drew) D. D. Sokoloff: Ann. Bot. Fenn. 37: 130. (2000) |
Web links |
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