Desmodium arizonicum |
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Arizona tick trefoil |
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Habit | Herbs, perennial. |
Stems | erect or ascending, usually striate, sparsely branched, 20–80 cm, pubescent. |
Leaves | trifoliolate; stipules caducous, narrowly ovate, 6–8 mm; petiole 1–5 mm; leaflet blades narrowly oblong-elliptic to linear, apex acute, surfaces villosulous; terminal blade 40–60 × 4–10 mm, length 3.5–10 times width. |
Inflorescences | usually unbranched; rachis uncinate-puberulent; primary bracts caducous, broadly ovate, 4.5–5.5 mm. |
Pedicels | 8–15 mm. |
Flowers | calyx 3 mm, uncinate-puberulent, lobes pubescent, tube 1.2 mm; abaxial lobes 2 mm, lateral lobes 1.5 mm; corolla blue-purple, 5–6 mm. |
Loments | sutures undulate abaxially, crenate adaxially; connections adaxial, 1/3 as broad as segments; segments (2 or)3–5, semiorbiculate, 4–5(–6) × 4 mm, rounded abaxially, convex adaxially, uncinate-puberulent; stipe 1–2 mm. |
2n | = 22. |
Desmodium arizonicum |
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Phenology | Flowering summer–fall. |
Habitat | Oak-juniper or pine woodlands, canyons, roadsides. |
Elevation | 1700–2500 m. (5600–8200 ft.) |
Distribution |
AZ; NM; Mexico (Baja California, Chihuahua, Sinaloa, Sonora, Tamaulipas)
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Discussion | In the flora area, Desmodium arizonicum is known from southeastern Arizona and adjacent New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Desmodium |
Sibling taxa | |
Synonyms | Meibomia arizonica |
Name authority | S. Watson: Proc. Amer. Acad. Arts 20: 363. (1885) |
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