Desmodium incanum |
Desmodium rosei |
|
---|---|---|
creeping beggarweed, Spanish clover, Spanish tick-trefoil, zarzabacoa comun |
rose tickclover, Rose's ticktrefoil |
|
Habit | Herbs, subshrubs, or shrubs, perennial; stoloniferous or rhizomatous. | Herbs, annual; with slender taproot. |
Stems | erect or ascending, to 300 cm, pubescent or glabrescent. |
erect, usually striate, 10–50 cm, obscurely uncinate-puberulent or glabrescent. |
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 persistent, patent, subulate or narrowly deltate (from broad base), 2–3 mm; petiole 10–35 mm; leaflet blades linear to narrowly oblong, apex obtuse, surfaces sparsely uncinate-puberulent; terminal blade 20–70 × 2–5 mm, length 7+ times width. |
Inflorescences | unbranched; rachis densely patent uncinate-pubescent; primary bracts caducous, narrowly ovate, 6–7 mm. |
usually unbranched; rachis sparsely patent uncinate-puberulent; primary bracts usually persistent, subulate, patent, 1.5–4 mm. |
Pedicels | persistent with calyx-remnant at top after loments drop, 5–9 mm. |
15–20(–25) 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 1 mm, sparsely puberulent, tube 0.8–1 mm; abaxial lobes 1 mm, lateral lobes 1 mm; corolla pink or pink-purple, 3–3.5 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. |
margins sometimes slightly involute, sutures equally crenate; connections central, 1/5 as broad as segments; segments 2–4, rounded, 3–3.5 × 3 mm, rounded abaxially and adaxially, inconspicuously reticulate, glabrous; stipe 1–1.5 mm. |
2n | = 22. |
|
Desmodium incanum |
Desmodium rosei |
|
Phenology | Flowering spring–fall. | Flowering late summer–fall. |
Habitat | Pine-palmetto flatwoods, woodland borders, lawns, ruderal sites, disturbed or waste areas. | Dry, open woodlands, with yucca, desert shrubs, grasslands, pinyon-juniper woodlands, on ledges. |
Elevation | 0–50 m. (0–200 ft.) | 1000–2400 m. (3300–7900 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]
|
AZ; NM; Mexico (Chihuahua, Sonora, Zacatecas)
|
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.) |
Desmodium rosei is known in the flora area from southeastern Arizona and southwestern New Mexico. (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 | |
Name authority | (Swartz) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 332. (1825) — name conserved | B. G. Schubert: Contr. Gray Herb. 129: 22, plate 1, fig. A. (1940) |
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