Rhynchosia minima |
Rhynchosia tomentosa |
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least snoutbean |
twining snoutbean |
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Habit | Herbs or subshrubs. | Herbs or subshrubs. | ||||
Stems | usually prostrate or twining, rarely ascending, rarely viscid, glabrous, puberulent, or villosulous, hairs silvery or grayish, spreading or reflexed. |
ascending or erect, tomentulose to hirtellous, hairs silvery to tawny. |
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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. |
usually trifoliolate, proximalmost sometimes unifoliolate; stipules caducous or persistent, lanceolate to linear-lanceolate, 3–12 × 1.5–3.5 mm, apex acuminate; petiole 5–35 mm, densely canescent-tomentose abaxially, villous adaxially; leaflet blades oblong or ovate to rhombic-ovate, elliptic, or obovate, 20–50(–60) × 10–40(–50) mm, leathery, gland-dotted, base obtuse, subcordate, or broadly cuneate, apex acute, obtuse, or rounded, minutely apiculate, surfaces puberulent, strigulose, or villosulous. |
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Inflorescences | racemes, longer than leaves, 2–20 cm. |
racemes, shorter than leaves, axillary ones 1.5–4(–5) cm, terminal ones 6.5–23 cm. |
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Pedicels | 1–5 mm. |
1–3 mm. |
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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. |
calyx 6–9 mm, hirtellous, tube 1.5–2.5 mm, lobes narrowly lanceolate to linear-subulate, laterals 4.5–7.5 mm, lengths 3+ times tube, adaxials 2–2.5 mm; corolla yellow or bright yellow; banner orbiculate, 6–9 × 5–7 mm, emarginate, glabrous; wings oblong, 6–8 × 1.5–2.5 mm, glabrous; keel 5–7.5 × 2–2.5 mm, glabrous; stamens 5.5–7.5 mm. |
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Legumes | falcate to oblong-ovoid, compressed, 9–20 × 3–5 mm, glabrous, puberulent, or villosulous. |
ovoid-oblong, compressed, 15–20 × 5–7 mm, hirtellous and puberulent, hairs intermixed. |
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Seeds | grayish, brown, black, or mottled, ovoid-reniform, plump, 3–4 × 2–3 mm. |
brown, black, or mottled, subglobose, compressed, 3–4 × 3–4 mm. |
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2n | = 22. |
= 22. |
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Rhynchosia minima |
Rhynchosia tomentosa |
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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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e United States; s United States
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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.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||
Parent taxa | Fabaceae > subfam. Faboideae > Rhynchosia | Fabaceae > subfam. Faboideae > Rhynchosia | ||||
Sibling taxa | ||||||
Subordinate 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 | Glycine tomentosa | ||||
Name authority | (Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prod. 2: 385. (1825) | (Linnaeus) Hooker & Arnott: Compan. Bot. Mag. 1: 23. (1835) | ||||
Web links |