Desmodium viridiflorum |
Desmodium lineatum |
|
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velvetleaf tickclover, velvetleaf ticktrefoil |
sand ticktrefoil |
|
Habit | Herbs or subshrubs, perennial. | Herbs, perennial, often mat-forming. |
Stems | erect, mostly unbranched, 30–300 cm, densely (sparsely in age) villosulous, also densely uncinate-puberulent and -pubescent. |
prostrate, lineate, to 100 cm, uncinate-puberulent and -pubescent, also sparsely to moderately pilose. |
Leaves | trifoliolate; stipules caducous, narrowly ovate to ovate, 3–7 mm; petiole 15–40 mm; leaflet blades broadly ovate or broadly rhombic, base acute to cuneate or truncate, apex acute to acuminate, surfaces densely velvety or villous, especially on veins abaxially, uncinate-puberulent and obscurely strigose on veins adaxially; terminal blade 50–120(–150) × 35–90 mm, length 1–1.5(–2) times width. |
trifoliolate; stipules mostly persistent, inconspicuous, narrowly ovate, 2–5 mm; petiole 5–21 mm; leaflet blades orbiculate or broadly rhombic-ovate, apex rounded, surfaces glabrous or inconspicuously spreading-villous abaxially, glabrous adaxially; terminal blade 15–30 × 10–30 mm, length 1–1.2 times width. |
Inflorescences | branched or unbranched; rachis uncinate-pubescent and sparsely villous; primary bracts narrowly deltate, 3 mm, pilose. |
densely flowered, ascending, usually terminal and branched, axillary and unbranched; rachis uncinate-puberulent; primary bracts caducous, ovate, 1–2 mm. |
Pedicels | 3–9 mm. |
6–12 mm. |
Flowers | calyx 2–3 mm, spreading-pilose, tube 2 mm; abaxial lobes 2.5–4.5 mm, lateral lobes 2–4 mm; corolla purple to pink or pallid lavender, 7–8 mm. |
calyx 2 mm, puberulent and ± pilose, tube 1 mm; abaxial lobes 1.5 mm, lateral lobes 1 mm; corolla usually purple, rarely white, 3.5–5 mm. |
Loments | sutures subdentate abaxially, sinuate adaxially; connections adaxial, 1/3–1/2 as broad as segments; segments (3 or)4 or 5, rhombic, 5–8(–9) × 3–3.5 mm, symmetrically angled abaxially, straight or convex adaxially, moderately to densely uncinate-puberulent throughout; stipe 3–6 mm. |
sutures deeply crenate abaxially, sinuate adaxially; connections adaxial, 1/3 as broad as segments; segments 2–4, ovate-orbiculate or obovate, 3.5–6 × 2.5–4 mm, symmetrically rounded abaxially, convex adaxially, uncinate-pubescent and pilose throughout; stipe 1–2.5 mm. |
2n | = 22. |
|
Desmodium viridiflorum |
Desmodium lineatum |
|
Phenology | Flowering summer–fall. | Flowering late summer–fall(–spring). |
Habitat | Open, often cutover woodlands and borders, old fields, roadsides. | Open wood-lands, savannas, sandhills, pastures, abandoned fields. |
Elevation | 0–900 m. (0–3000 ft.) | 0–200 m. (0–700 ft.) |
Distribution |
AL; AR; DC; DE; FL; GA; IL; IN; KY; LA; MD; MO; MS; NC; OH; OK; PA; SC; TN; TX; VA; WV
|
AL; DC; DE; FL; GA; LA; MD; MS; NC; SC; TX; VA; WV
|
Discussion | In Illinois, Desmodium viridiflorum is known only from Alexander County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Desmodium arenicola (Vail) F. J. Hermann and Meibomia arenicola Vail are illegitimate names that pertain here. In Texas, Desmodium lineatum is known from fewer than ten counties adjacent to Louisiana. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Desmodium | Fabaceae > subfam. Faboideae > Desmodium |
Sibling taxa | ||
Synonyms | Hedysarum viridiflorum, Meibomia viridiflora | Hedysarum lineatum, Meibomia arenicola var. polymorpha, M. lineata, M. lineata var. polymorpha, M. polymorpha |
Name authority | (Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 329. (1825) | de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 330. (1825) |
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