Acmispon strigosus |
Acmispon mearnsii |
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strigose lotus |
Mearns' deervetch |
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Habit | Herbs, annual, usually mat-forming, sometimes cespitose (ascending and bushy), green to grayish, 0.3–5 dm, not or ± fleshy, strigillose, hirsute, canescent-tomentose, or scantily pubescent; taprooted. | Herbs, perennial, mat-forming, silvery, 2–6 dm, not fleshy, tomentose; from woody caudices. | ||||||||||||
Stems | 1–20+, procumbent or decumbent to ascending, branched basally, herbaceous, slender, leafy. |
1–20+, procumbent or the central ascending, branched, herbaceous, leafy. |
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Leaves | irregularly pinnate; stipules glandlike; subsessile; rachis 3–20 mm, flattened; leaflets 4–10, blades unequal, obovate to oblanceolate to linear-oblong or oblong, apex acute to obtuse or truncate, surfaces ± densely tomentose to glabrate. |
pinnate to subpalmate; stipules glandlike; short-petiolate; rachis 2–5 mm, flattened; leaflets 3–5, blades obovate to oblanceolate or broadly obovate to obcordate, apex usually obtuse to acute, sometimes mucronulate, or retuse to cordate, surfaces gray-puberulent. |
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Inflorescences | 1–3-flowered. |
(1 or)2–7-flowered. |
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Peduncles | ascending or reflexed, upturned, 3–25 mm, shorter to longer than leaves (often elongated in fruit); bract absent or 1–3-foliolate, usually subtending umbel. |
curved to erect, 25–75(–95) mm, longer than leaves; bract absent or 1(–3)-foliolate, distal. |
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Flowers | (5–)6–10(–12) mm; calyx 3–5.5 mm, tube ± sparsely strigillose or glabrous, lobes subulate; corolla yellow (sometimes banner orangish abaxially), turning orange or reddish, claws ± equaling calyx tube, banner implicate-ascending or remaining closely implicate, wings longer than keel; style corneously thickened, marked by color, straight, puberulent or glabrous. |
12–20 mm; calyx 3.5–5 mm, tube puberulent, lobes narrow lanceolate; corolla yellow to cream, often suffused with red, claws shorter than calyx tube, banner ascending 45–90°, wings ± equaling to longer than keel; style nearly straight, glabrous. |
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Legumes | persistent, exserted, erect or divergent, brown, straight to ± curved distally, compressed, not or slightly constricted, incompletely septate, linear-oblong, 10–35 × 2–3 mm, thinly leathery, apex initially short-beaked, dehiscent, smooth, margins smooth, thin, glabrous or ± strigose. |
subpersistent, exserted, erect to ascending, tawny to brown, straight, turgid, not constricted, ± septate, oblong, 15–35(–40) × 3–7 mm, leathery, apex short-beaked, dehiscent, smooth, margins smooth, thickened, strigillose. |
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Seeds | 5–10, greenish to brown, ± mottled, ovoid to cuboid or globose, rugulose or granular. |
3–6, brown, ± mottled, oblong, ± rugose to smooth. |
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Acmispon strigosus |
Acmispon mearnsii |
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Distribution | sw United States; n Mexico |
Arizona |
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Discussion | Varieties 3 (3 in the flora). D. Isely (1981) discussed the variation in Acmispon strigosus (as Lotus), distinguishing three varieties, two rather distinct but with intergrading phases, and one apparently more transitional, although distinct enough to be recognized. These varieties were only noted for California in recent treatments (for example, L. Brouillet 2012, following D. Isely 1993). Nonetheless, the typical (for example, excluding intergrading phases) varieties represent recognizable morphologies that also have geographic distinction. Specimens representing intergradation seem to occur throughout the range of overlap of these varieties, sometimes rendering determination difficult. (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 strigosa, Anisolotus strigosus, Lotus strigosus, Ottleya strigosa | Hosackia mearnsii, Anisolotus mearnsii, Lotus mearnsii, Ottleya mearnsii | ||||||||||||
Name authority | (Nuttall) Brouillet: J. Bot. Res. Inst. Texas 2: 392. (2008) | (Britton) Brouillet: J. Bot. Res. Inst. Texas 2: 391. (2008) | ||||||||||||
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