Rhynchosia texana |
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Texas snoutbean |
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Habit | Herbs. |
Stems | usually prostrate or twining, rarely subascending, puberulent to strigulose or villosulous, hairs silvery. |
Leaves | trifoliolate; stipules persistent, linear or linear-lanceolate, 1.5–3 × 0.5 mm, acute to acuminate; petiole 5–35 mm, puberulous, strigulose, or villosulous; leaflet blades lanceolate-ovate, 5–45 × 20–25 mm, leathery, gland-dotted, base obtuse or subcordate, margins revolute, apex acute or obtuse, surfaces puberulent, strigulose, or villosulous. |
Inflorescences | 1(2 or 3) simple flowers per axil, shorter than leaves, 0.6–1.5 cm. |
Pedicels | 1–6 mm. |
Flowers | calyx 3–5 mm, villous or villosulous, tube 1.5–2.5 mm, lobes subulate, laterals 1–3.5 mm, lengths to 2.5 times tube, adaxials 0.5–2 mm; corolla yellow, veined brown; banner widely ovate, 5–7 × 3.5–5 mm, apex emarginate, puberulent; wings oblong to ovate, 5–6 × 1–2 mm, glabrous; keel 5–6.5 × 2–2.5 mm, glabrous; stamens 4–6 mm. |
Legumes | oblong, compressed, 15–25 × 4–6 mm, puberulent-hirtellous, hairs intermixed. |
Seeds | brown, black or mottled, subglobose, compressed, 3–4 × 3–4 mm. |
2n | = 22. |
Rhynchosia texana |
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Phenology | Flowering spring–summer. |
Habitat | Dry limestone, sandy or igneous soils, grasslands, canyons, mountain slopes, roadsides, forest clearings. |
Elevation | 40–2700 m. (100–8900 ft.) |
Distribution |
AZ; NM; TX; South America; Mexico (Chiapas, Chihuahua, Coahuila, Durango, Nuevo León, Puebla, San Luis Potosí, Sonora, Tamaulipas, Veracruz) |
Discussion | Rhynchosia angustifolia Engelmann ex A. Gray is an illegitimate name that pertains here. Dolicholus texensis Vail and its var. angustifolius (A. Gray) Vail are illegitimate and superfluous names that also pertain here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Rhynchosia |
Sibling taxa | |
Synonyms | R. senna var. angustifolia, R. senna var. cordobensis, R. senna var. texana, R. texana var. angustifolia, R. texana var. microphylla |
Name authority | Torrey & A. Gray: Fl. N. Amer. 1: 687. (1840) |
Web links |