Rhynchosia minima |
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least snoutbean |
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Habit | Herbs or subshrubs. |
Stems | usually prostrate or twining, rarely ascending, rarely viscid, glabrous, puberulent, or villosulous, hairs silvery or grayish, spreading or reflexed. |
Leaves | trifoliolate; stipules persistent, linear to lanceolate, 1–6 × 1–2 mm, apex acuminate, surfaces puberulent to villosulous; petiole 4–100 mm, glabrous, tomentulose, or villosulous; leaflet blades rhombic-orbiculate, rhombic, subrhombic, or ovate, 30–90 × 5–70 mm, membranous or nearly leathery, gland-dotted, base obtuse to rounded, cuneate, or truncate, apex acuminate to obtuse, surfaces glabrous, puberulent, or sparsely to densely villosulous abaxially, glabrous or finely strigose, villosulous, or puberulent adaxially. |
Inflorescences | racemes, longer than leaves, 2–20 cm. |
Pedicels | 1–5 mm. |
Flowers | calyx 3–6 mm, puberulent or villosulous, tube 1.5–2 mm, lobes lanceolate, laterals 1.5–4 mm, lengths to 2.5 times tube, adaxials 0.5–1 mm; corolla yellow, veined purple or brown; banner orbiculate-ovate, 4–6 × 3–5 mm, emarginate, puberulent, gland-dotted; wings narrowly oblong, 4.5–5 × 1–2 mm, narrowly gland-dotted, puberulent apically; keel 5–6 × 2–3 mm, glabrous; stamens 5–7 mm. |
Legumes | falcate to oblong-ovoid, compressed, 9–20 × 3–5 mm, glabrous, puberulent, or villosulous. |
Seeds | grayish, brown, black, or mottled, ovoid-reniform, plump, 3–4 × 2–3 mm. |
2n | = 22. |
Rhynchosia minima |
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Phenology | Flowering spring–summer. |
Habitat | Disturbed areas, forests, edges, prairies, sand dunes. |
Elevation | 0–100 m. (0–300 ft.) |
Distribution |
AL; AR; FL; LA; MO; MS; TX; Central America; South America; West Indies; Bermuda
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Discussion | Rhynchosia minima was recently collected in Alabama after an absence of over 100 years (A. R. Diamond 2015). Glycine littoralis Vahl ex de Candolle is an illegitimate name that pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Rhynchosia |
Sibling taxa | |
Synonyms | Dolichos minimus, Dolicholus minimus, Glycine lamarckii, G. reflexa, Phaseolus caribaeus, R. aureoguttata, R. exigua, R. mexicana, R. minima var. diminifolia, R. minima var. lutea, R. minima var. pauciflora, R. punctata |
Name authority | (Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prod. 2: 385. (1825) |
Web links |