Rhynchosia
snoutbean
prostrate, procumbent, twining, ascending, or erect, pubescent or glabrous.
alternate, unifoliolate or trifoliolate;
stipules present, striate;
petiolate;
stipels deciduous;
leaflets 1 or 3, 0.5–2.5 mm, blade margins entire, surfaces gland-dotted abaxially, sometimes also adaxially, pubescent or glabrous.
1–3-flowered, usually axillary, rarely terminal, usually racemes;
bracts present, striate.
papilionaceous;
calyx campanulate with relatively long lobes, or tubulous-campanulate with relatively short lobes, lobes 5;
corolla yellow, yellow-orange, or green-yellow, often with purple or brown tinge or streaks, (4–)6–12(–14) mm;
stamens 10, diadelphous;
anthers dorsifixed.
legumes, sessile or subsessile, usually compressed, ovoid to ellipsoid, falcate, or acinaciform, beaked, dehiscent, gland-dotted, pubescent or glabrous.
1 or 2, subglobose, ovoid to ellipsoid, or reniform.
= 11.
Rhynchosia
Species ca. 200 (14 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaves usually unifoliolate, distalmost rarely trifoliolate. | → 2 |
2. Calyces 14–16 mm; wings oblong, 9–11 mm; stamens 9–10 mm; leaflet surfaces tomentose-woolly abaxially. | R. michauxii |
2. Calyces 7–13 mm; wings narrowly oblong, 6.5–7.7 mm; stamens 6–8.5 mm; leaflet surfaces hirtellous or villosulous abaxially. | → 3 |
3. Stems usually ascending or erect, rarely twining; calyces densely hirtellous and gland-dotted; banners 6.5–7 mm; keel petals 6.7–7 × 2–2.5 mm; stamens 6–7 mm. | R. reniformis |
3. Stems procumbent, trailing, or twining; calyces villosulous; banners 8.5–10 mm; keel petals 8–9 × 3–3.5 mm; stamens 7.5–8.5 mm. | R. americana |
1. Leaves usually trifoliolate, proximalmost sometimes unifoliolate. | → 4 |
4. Calyces: lateral lobes 3+ times tubes. | → 5 |
5. Inflorescences longer than leaves; leaflet surfaces villous abaxially; seeds brown- gray or mottled. | R. latifolia |
5. Inflorescences shorter than leaves; leaflet surfaces puberulent, villosulous, hirtellous, strigulose, or strigose abaxially; seeds brown, black, or mottled. | → 6 |
6. Stems ascending or erect; calyces: adaxial lobes 2–2.5 mm. | R. tomentosa |
6. Stems usually prostrate or twining, rarely climbing or erect; calyces: adaxial lobes 3–5 mm. | → 7 |
7. Petioles strigulose; stems prostrate, rarely climbing. | R. cinerea |
7. Petioles hirsute; stems prostrate or twining. | R. difformis |
4. Calyces: lateral lobes to 2.5 times tubes. | → 8 |
8. Stem hairs yellowish; Santa Cruz County, Arizona. | R. edulis |
8. Stem hairs silvery or grayish; Alabama, Arizona, Arkansas, Florida, Louisiana, Mississippi, Missouri, New Mexico, Texas. | → 9 |
9. Stamens 3.5–7 mm. | → 10 |
10. Legumes falcate to oblong-ovoid; seeds ovoid-reniform; wings puberulent apically. | R. minima |
10. Legumes oblong or acinaciform; seeds reniform or subglobose; wings glabrous. | → 11 |
11. Leaflets ± leathery, blades lanceolate-ovate, margins revolute; flowers solitary, 1(2 or 3)-clustered; inflorescences shorter than leaves. | R. texana |
11. Leaflets membranous, blades ovate, margins flat; flowers in solitary racemes; inflorescences longer than leaves. | R. swartzii |
9. Stamens 8–12 mm. | → 12 |
12. Calyces: lateral lobes 2–3 mm; wings puberulent apically, 6–7 mm; seeds red and black, 5–8 mm. | R. precatoria |
12. Calyces: lateral lobes 4–5 mm; wings glabrous, 8–10 mm; seeds brown, black, or mottled, 2–4 mm. | → 13 |
13. Banners glabrous, keel petals 4–5 mm wide; seeds subglobose; hilum ovate; calyces hirtellous; leaflet surfaces gland-dotted and puberulent abaxially, strigose adaxially, blade bases cuneate. | R. cytisoides |
13. Banners puberulent (and gland-dotted), keel petals 2–2.5 mm wide; seeds ovoid-ellipsoid; hilum linear; calyces tomentose, viscid; leaflet surfaces grayish tomentulose, blades bases obtuse. | R. parvifolia |
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