Desmodium incanum |
Desmodium retinens |
|
---|---|---|
creeping beggarweed, Spanish clover, Spanish tick-trefoil, zarzabacoa comun |
Santa Rita Mountain ticktrefoil |
|
Habit | Herbs, subshrubs, or shrubs, perennial; stoloniferous or rhizomatous. | Herbs, perennial, diffuse; base woody, rootstock woody. |
Stems | erect or ascending, to 300 cm, pubescent or glabrescent. |
erect, ascending, or procumbent, usually striate, 30–60(–100) cm, sparsely to densely pilose and uncinate-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, sometimes unifoliolate proximally; stipules persistent, recurved, subulate, 2–3 mm; petiole 7–25 mm; leaflet blades usually oblong-ovate to narrowly so, sometimes broadly elliptic to oblong, apex obtuse or acute, surfaces sparsely uncinate-puberulent; terminal blade 10–30(–35) × 8–10 mm, length 1–3.5 times width. |
Inflorescences | unbranched; rachis densely patent uncinate-pubescent; primary bracts caducous, narrowly ovate, 6–7 mm. |
usually unbranched, sometimes branched; rachis patent uncinate-puberulent; primary bracts narrowly ovate, 2.5–3 mm. |
Pedicels | persistent with calyx-remnant at top after loments drop, 5–9 mm. |
8–15 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 1.5–2.5 mm, pubescent, tube 1 mm; abaxial lobes 1.5 mm, lateral lobes 1 mm; corolla pink-purple, 4–5 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. |
sutures subequally crenate; connections central, 1/5–1/4 as broad as segments; segments 2–7, rounded or broadly elliptic, 2.5–3 × 2.5 mm, abaxially and adaxially rounded, glabrous or slightly puberulent; stipe 1–2 mm. |
2n | = 22. |
|
Desmodium incanum |
Desmodium retinens |
|
Phenology | Flowering spring–fall. | Flowering late summer–fall. |
Habitat | Pine-palmetto flatwoods, woodland borders, lawns, ruderal sites, disturbed or waste areas. | Wooded or grassy rocky slopes, oak or oak-pine forests. |
Elevation | 0–50 m. (0–200 ft.) | 1400–2100 m. (4600–6900 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; Mexico; Central America (Guatemala) |
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 retinens is known in the flora area from Cochise, Graham, Pima, and Santa Cruz counties. (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 | D. wislizeni, Meibomia retinens |
Name authority | (Swartz) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 332. (1825) — name conserved | Schlechtendal: Linnaea 12: 311. (1838) |
Web links |