Acmispon grandiflorus |
Acmispon brachycarpus |
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chaparral bird's-foot trefoil, large leaf lotus, large-flower lotus |
colchita, foothill deervetch, Hill lotus, short pod lotus |
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Habit | Herbs, perennial, cespitose, sometimes robust, grayish or green, 1–4(–15) dm, not fleshy, ± densely puberulent or strigillose; rhizomatous, woody based. | Herbs, annual, mat-forming, cinereous or greenish, 0.5–4 dm, ± fleshy, villous to pubescent; taprooted. | ||||
Stems | 1–5+, decumbent to erect, branched, herbaceous, often striate, leafy. |
1–20+, procumbent to low-ascending, branched, herbaceous, leafy. |
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Leaves | irregularly pinnate; stipules glandlike, conic; petiolate or sessile; rachis 2–3.5(–5.5) mm, not flattened; leaflets 7–9(–12), blades usually elliptic to obovate, sometimes ovate, apex acute to obtuse, surfaces sparsely to densely puberulent or villosulous to strigillose. |
pinnate or palmate; stipules glandlike, sometimes absent; subsessile or sessile; rachis 4–10 mm, flattened; leaflets (3 or)4(or 5), usually 2 on one side and 2 terminal, blades elliptic to obovate(–oblanceolate), apex usually obtuse, sometimes acute, surfaces villous to pubescent. |
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Inflorescences | 3–9(–11)-flowered. |
1-flowered. |
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Peduncles | ascending or spreading, 10–80 mm, longer than leaves; bract 1(–3)-foliolate, distal. |
± sessile; bract absent. |
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Flowers | 12–25 mm; calyx (4.5–)5.5–10 mm, tube villosulous, lobes subulate; corolla greenish white, white or yellow, fading to rose or reddish, claws shorter than calyx tube, banner ascending 45–90°, wings longer than banner and keel; style nearly straight or basally curved, glabrous. |
5–9 mm; calyx 3–6 mm, accrescent, tube villous, lobes lanceolate; corolla pale yellow, reddish-tipped, turning red, claws shorter than calyx tube, banner horizontal to ascending to 90°, wings ± equaling keel; style curved, glabrous. |
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Legumes | persistent, exserted, brown, linear-oblong, straight, turgid, sometimes slightly constricted, incompletely septate, 25–42(–70) × 2–3 mm, leathery, apex short hook-beaked, dehiscent, smooth, margins smooth, thickened, glabrate. |
persistent, exserted, erect, brown or tawny, straight, compressed, slightly constricted, not septate, oblong, 6–12(–14) × 3–4 mm, stiffly papery, apex obtuse, dehiscent, smooth, margins smooth, thin, villous. |
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Seeds | 5–9, olive to reddish brown, mottled, broadly ovoid, smooth. |
(2 or)3(–5), tan to dark brown or blackish, faintly mottled, lenticular-elliptic (asymmetric), smooth. |
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2n | = 12. |
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Acmispon grandiflorus |
Acmispon brachycarpus |
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Phenology | Flowering late winter–spring. | |||||
Habitat | Rocky, open, disturbed areas, ridges, sand bars, desert flats or washes, stream beds and banks, sandy, gravelly, or clayey soils, serpentine, grasslands, oak-pine woodlands, chaparral, desert scrub, roadsides, agricultural fields. | |||||
Elevation | 0–1900(–2000) m. (0–6200(–6600) ft.) | |||||
Distribution | nw Mexico; California
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AZ; CA; ID; NM; NV; OR; UT; Mexico (Sonora)
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Acmispon brachycarpus occurs throughout California into southwestern Oregon (one old collection further north in the Willamette Valley), east through the Mojave Desert into Arizona and southwestern Nevada, and into southwestern New Mexico. Lotus brachycarpus Bentham & Hooker f. ex S. Watson (1878) is an invalid name that pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||
Parent taxa | Fabaceae > subfam. Faboideae > Acmispon | Fabaceae > subfam. Faboideae > Acmispon | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Hosackia grandiflora, Anisolotus grandiflorus, Lotus grandiflorus, Ottleya grandiflora | Hosackia brachycarpa, Anisolotus brachycarpus, A. trispermus, H. trisperma, Lotus humistratus, L. trispermus | ||||
Name authority | (Bentham) Brouillet: J. Bot. Res. Inst. Texas 2: 390. (2008) | (Bentham) D. D. Sokoloff: Ann. Bot. Fenn. 37: 130. (2000) | ||||
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