Desmodium incanum |
Desmodium viridiflorum |
|
---|---|---|
creeping beggarweed, Spanish clover, Spanish tick-trefoil, zarzabacoa comun |
velvetleaf tickclover, velvetleaf ticktrefoil |
|
Habit | Herbs, subshrubs, or shrubs, perennial; stoloniferous or rhizomatous. | Herbs or subshrubs, perennial. |
Stems | erect or ascending, to 300 cm, pubescent or glabrescent. |
erect, mostly unbranched, 30–300 cm, densely (sparsely in age) villosulous, also densely uncinate-puberulent and -pubescent. |
Leaves | trifoliolate; stipules usually persistent, narrowly ovate-deltate, 5–10 mm; petiole usually 15–20 mm; leaflet blades elliptic to ovate, apex obtuse or acute, surfaces finely spreading-villosulous to substrigose abaxially, uncinate-puberulent or glabrescent adaxially; terminal blade 20–90 × 15–45 mm, length 1.5–4 times width. |
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. |
Inflorescences | unbranched; rachis densely patent uncinate-pubescent; primary bracts caducous, narrowly ovate, 6–7 mm. |
branched or unbranched; rachis uncinate-pubescent and sparsely villous; primary bracts narrowly deltate, 3 mm, pilose. |
Pedicels | persistent with calyx-remnant at top after loments drop, 5–9 mm. |
3–9 mm. |
Flowers | calyx 2–3.5 mm, uncinate-puberulent, lobes pilose, tube 1 mm; abaxial lobes 1.5–2.5 mm, lateral lobes 1–2 mm; corolla purple, 5–8 mm. |
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. |
Loments | sutures symmetrically crenate abaxially, straight or slightly sinuate adaxially; connections central, 1/2–2/3 as broad as segments; segments 4–8, semiobovate, 3.5–5 × 2.5–3 mm, broadly rounded abaxially, straight or barely convex adaxially, uncinate-puberulent; stipe 1.5–2 mm. |
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. |
2n | = 22. |
= 22. |
Desmodium incanum |
Desmodium viridiflorum |
|
Phenology | Flowering spring–fall. | Flowering summer–fall. |
Habitat | Pine-palmetto flatwoods, woodland borders, lawns, ruderal sites, disturbed or waste areas. | Open, often cutover woodlands and borders, old fields, roadsides. |
Elevation | 0–50 m. (0–200 ft.) | 0–900 m. (0–3000 ft.) |
Distribution |
AL; FL; GA; TX; Central America; South America; Mexico (Chiapas, Jalisco, Oaxaca, Quintana Roo, Tamaulipas, Veracruz); West Indies [Introduced in North America; introduced also in Asia (Taiwan), Africa, Indian Ocean Islands (Mauritius, Reunion), Pacific Islands, Australia]
|
AL; AR; DC; DE; FL; GA; IL; IN; KY; LA; MD; MO; MS; NC; OH; OK; PA; SC; TN; TX; VA; WV
|
Discussion | Desmodium incanum may be distinguished by its long-persistent stipules usually fused and nearly surrounding the stem, at least when young, and by its pedicels which are usually borne singly and are each subtended by one primary bract and two (lateral) secondary bracts (B. G. Schubert 1980). Desmodium incanum was long known as D. canum Schinz & Thellung (= Meibomia cana S. F. Blake) based on the illegitimate Hedysarum canum J. F. Gmelin, a superfluous name for H. racemosum Aublet. The complex nomenclatural history was elaborated by D. H. Nicolson (1978) and L. C. P. Lima et al. (2012, 2014). Hedysarum canescens Miller (1768) is a later homonym of H. canescens Linnaeus (1753), thus illegitimate, and pertains here. Hedysarum canum J. F. Gmelin is a superfluous name for H. racemosum Aublet; Meibomia cana S. F. Blake was intended as a new combination based on that name. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
In Illinois, Desmodium viridiflorum is known only from Alexander County. (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 incanum, Aeschynomene incana, D. ancistrocarpum, D. canum, D. frutescens, D. frutescens var. amplyophyllum, D. malacophyllum, D. mauritianum, D. supinum var. amblyophyllum, H. ancistrocarpum, H. malacophyllum, H. mauritianum, H. racemosum, Meibomia adscendens var. incana, M. incana, M. malacophylla, M. supina | Hedysarum viridiflorum, Meibomia viridiflora |
Name authority | (Swartz) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 332. (1825) — name conserved | (Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 329. (1825) |
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