Acmispon grandiflorus |
Acmispon americanus |
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chaparral bird's-foot trefoil, large leaf lotus, large-flower lotus |
American bird's-foot trefoil, American deervetch, deer-vetch, prairie trefoil, Spanish clover, Spanish 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, solitary or cespitose, green, 0.5–6(–12) dm, not fleshy, glabrate to ± pilose; taprooted. | ||||||||
Stems | 1–5+, decumbent to erect, branched, herbaceous, often striate, leafy. |
1–10+, erect to procumbent, branched proximally, 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; stipules glandlike; subsessile to short-petiolate; rachis 0.5–3(–4) mm, not flattened; leaflets (1–)3(–5), blades obovate, ovate, or elliptic to lanceolate, margins denticulate or entire, apex acute, surfaces sparsely appressed-hairy. |
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Inflorescences | 3–9(–11)-flowered. |
1(or 2)-flowered. |
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Peduncles | ascending or spreading, 10–80 mm, longer than leaves; bract 1(–3)-foliolate, distal. |
in distal axils, ascending, 3–25 mm, longer than leaves; bract unifoliolate, distal. |
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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. |
(4–)5–9 mm; calyx (2.5–)3–6.5 mm, tube pilose, lobes linear-lanceolate, accrescent; corolla whitish or cream, turning pink or salmon, banner rose-striate, keel tip yellow, claws shorter than calyx tube, banner implicate-ascending to erect, wings ± equaling keel; style abruptly angled upward 45°, 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, spreading or pendent, brown, straight or ± curved, compressed, slightly constricted, not septate, linear-oblong to narrowly oblong, (15–)20–30(–40) × (1.5–)2–2.5 mm, thinly leathery, apex abruptly downward angled and curved, dehiscent, smooth, margins smooth, thickened, glabrous. |
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Seeds | 5–9, olive to reddish brown, mottled, broadly ovoid, smooth. |
(3–)5–8, olive to light brown, often black-mottled, oblong, smooth. |
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Acmispon grandiflorus |
Acmispon americanus |
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Distribution | nw Mexico; California
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North America; nw Mexico
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (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 | Trigonella americana, Hosackia americana | ||||||||
Name authority | (Bentham) Brouillet: J. Bot. Res. Inst. Texas 2: 390. (2008) | (Nuttall) Rydberg: Bull. Torrey Bot. Club 40: 45. (1913) | ||||||||
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