Desmodium canescens |
Desmodium arizonicum |
|
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hoary tick-trefoil, hoary tickclover |
Arizona tick trefoil |
|
Habit | Herbs, perennial. | Herbs, perennial. |
Stems | erect or ascending, branched, 50–200 cm, conspicuously or sparsely villous and uncinate-pubescent. |
erect or ascending, usually striate, sparsely branched, 20–80 cm, pubescent. |
Leaves | trifoliolate; stipules mostly persistent, usually reflexed, broadly or narrowly ovate, 5–13 mm, base oblique, often auriculate, subamplexicaul; petiole 30–60 mm; leaflet blades ovate, thick, papery, apex acute to gradually acuminate, surfaces densely uncinate-puberulent abaxially, uncinate-puberulent and pubescent on veins adaxially; terminal blade 50–130 × 30–100 mm, length 1.5–2 times width. |
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 | paniclelike, branched; rachis densely patent bulbous-villous and uncinate-puberulent; primary bracts caducous, narrowly ovate, 4–6 mm. |
usually unbranched; rachis uncinate-puberulent; primary bracts caducous, broadly ovate, 4.5–5.5 mm. |
Pedicels | persistent, 8–13 mm. |
8–15 mm. |
Flowers | calyx 3–5 mm, sparsely or densely puberulent, tube 1 mm; abaxial lobes to 3 mm, lateral lobes 1 mm; corolla usually purple to pinkish, rarely white, 9–13 mm. |
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 dentate or crenate abaxially, sinuate adaxially; connections adaxial, 1/3–1/2 as broad as segments; segments 4–6, broadly elliptic, 6.5–13 × 4–7 mm, obtusely angled abaxially becoming round, convex adaxially, uncinate-puberulent and villous, hairs particularly dense on sutures and between segments; stipe 2.5–6 mm. |
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. |
= 22. |
Desmodium canescens |
Desmodium arizonicum |
|
Phenology | Flowering summer. | Flowering summer–fall. |
Habitat | Open, dry woodlands, cutover areas, thickets, roadsides. | Oak-juniper or pine woodlands, canyons, roadsides. |
Elevation | 0–900 m. (0–3000 ft.) | 1700–2500 m. (5600–8200 ft.) |
Distribution |
AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; NC; NE; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; WI; WV; ON
|
AZ; NM; Mexico (Baja California, Chihuahua, Sinaloa, Sonora, Tamaulipas)
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Discussion | In Texas, Desmodium canescens is known from the eastern third of the state. In Florida, it occurs only in the panhandle region. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Hedysarum canescens, Meibomia canescens | Meibomia arizonica |
Name authority | (Linnaeus) Poiret in F. Cuvier: Dict. Sci. Nat. ed. 2, 13: 110. (1819) | S. Watson: Proc. Amer. Acad. Arts 20: 363. (1885) |
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