Acmispon dendroideus |
Acmispon americanus |
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island broom |
American bird's-foot trefoil, American deervetch, deer-vetch, prairie trefoil, Spanish clover, Spanish lotus |
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Habit | Shrubs or subshrubs, erect or procumbent, low to robust, green or gray, 5–20 dm, not fleshy, sparsely to densely strigose; from woody caudices. | Herbs, annual, solitary or cespitose, green, 0.5–6(–12) dm, not fleshy, glabrate to ± pilose; taprooted. | ||||||||||||
Stems | 1–10+, erect or decumbent, branched, woody, leafy. |
1–10+, erect to procumbent, branched proximally, herbaceous, leafy. |
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Leaves | irregularly pinnate; stipules glandlike; short-petiolate to petiolate; rachis 3–10 mm, not flattened; leaflets 3–5, blades narrowly obovate to elliptic or oblong, apex acute to obtuse, surfaces sparsely to densely strigose. |
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–)7–12-flowered. |
1(or 2)-flowered. |
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Peduncles | ascending, 2–10 mm, shorter than leaves; bract absent or unifoliolate, subtending umbel. |
in distal axils, ascending, 3–25 mm, longer than leaves; bract unifoliolate, distal. |
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Flowers | 8–12 mm; calyx 4–6 mm, tube sparsely strigose to glabrate, lobes short-subulate to deltate; corolla yellow, claws ± longer than calyx tube, banner implicate-ascending to 90°, wings ± equaling keel; style abruptly incurved 90°, 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, divergent to declined, brown, straight or curved, turgid, slightly constricted, not septate, linear-oblong, 10–50 × 1–2 mm, leathery, apex tapering, long-beaked, indehiscent, ± veined, margins thickened, smooth, glabrate or sparsely strigose. |
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 | 1–4(–6), brown (paler veined), not mottled, cylindric, smooth. |
(3–)5–8, olive to light brown, often black-mottled, oblong, smooth. |
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Acmispon dendroideus |
Acmispon americanus |
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Distribution | California
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North America; nw Mexico
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Discussion | Varieties 3 (3 in the flora). In a phylogeographic study of Acmispon dendroideus, L. E. Wallace et al. (2017) showed that var. traskiae is sister to vars. dendroideus and veatchii. Acmispon dendroideus has been reported from Baja California, Mexico, but the material is inadequate for confident determination. (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 | ||||||||||||
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Subordinate taxa | ||||||||||||||
Synonyms | Syrmatium dendroideum, Hosackia dendroidea, Lotus dendroideus, L. scoparius var. dendroideus | Trigonella americana, Hosackia americana | ||||||||||||
Name authority | (Greene) Brouillet: J. Bot. Res. Inst. Texas 2: 389. (2008) | (Nuttall) Rydberg: Bull. Torrey Bot. Club 40: 45. (1913) | ||||||||||||
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