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Key to Rhynchosia

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1 Leaves unifoliolate (rarely with a few upper leaves trifoliolate).
..2 Plants erect or ascending, usually with fewer than 6 leaves; stipels present
..2 Plant prostrate, trailing, usually with many leaves; stipels absent.
....3 Calyx 8-11 mm long, the lobes 1.5-2.0 mm wide; [s. and se. TX]
....3 Calyx 10-14 mm long, the lobes 3-4 mm wide; [FL and s. GA]
1 Leaves trifoliolate (rarely with a few lowermost leaves unifoliolate, these generally withering before flowering and fruiting).
......4 Plant erect; pubescence of the lower leaf surface not restricted to the veins (except in the rare upright forms of R. difformis keyed below).
........5 Terminal leaflet suborbicular, 1.0-1.3× as long as wide; plants ascending to erect (or more usually twining [keyed elsewhere])
........5 Terminal leaflet elliptic1.6-2.5× as long as wide; plants erect.
..........6 Plant lavishly branched, bushy (with something of the aspect of a Baptisia); terminal leaflets 0.5-2.0 cm long; pubescence of the lower leaf surface sparse, not velvety to the touch; flowers solitary (-3) in leaf axils
..........6 Plant unbranched or with few well-developed branches in its upper portion; terminal leaflets (2.0-) 2.5-5 cm long; pubescence of the lower leaf surface grayish tomentose and velvety to the touch; flowers many, in racemes.
............ 7 Inflorescence a single exserted terminal raceme, 5-20 cm long; stipules caducous; [plants of s. SC southward]
............ 7 Inflorescences several and axillary, each 1-3 cm long (or with a short terminal inflorescence also); stipules persistent; [plants widespread in our area]
......4 Plant trailing or twining; pubescence of the lower leaf surface mostly restricted to the veins.
............ ..8 Calyx 7-14 mm long, about as long as the corolla; [plants collectively widespread in our area].
............ ....9 Calyx 10-14 mm long; inflorescence (including peduncle) 5-25 cm at anthesis, elongating further in fruit, with flowers scattered; [MS and w, TN westward]
............ ....9 Calyx 7-10 (-12) mm long; inflorescence (including peduncle) 1-2 cm long at anthesis, elongating to 4 (-8) cm, the flowers tightly packed; [collectively widespread in our area].
............ ......10 Terminal leaflet 1-5 cm long.
............ ........11 Pubescence of petiole of mostly incurved hairs 0.2-0.4 mm long; terminal leaflet 1-3 (-3.5) cm long; plants generally trailing; [of ne. FL southward]
............ ........11 Pubescence of petiole of mostly spreading hairs 0.5-0.6 mm long; terminal leaflet (2-) 2.5-5 cm long; plants generally twining; [widespread in our area]
............ ..8 Calyx 2.5-7 mm long, clearly shorter than the corolla; [plants of e. GA southward and westward].
............ ..........12 Flowers 1-3 per inflorescence; leaflets 2.2-5× as long as wide; [se. TX and s. TX southwards and westwards]
............ ..........12 Flowers 2-15 per inflorecence; leaflets 0.8-2.5× as long as wide; [e. GA southwards and westwards, including se. and s. TX].
............ ............ 13 Calyx 2.5-3 (-4) mm long; raceme 4-12 cm long, clearly exceeding the subtending leaves; leaflets 0.8-1.2× as long as wide; [e. GA southwards and westwards]
............ ............ 13 Calyx 3.5-7 mm long; raceme 1-4 (-5) cm long, barely if at all exceeding the subtending leaves; leaflets 1.2-2.5× as long as wide; [plants of s. peninsular FL].
............ ............ ..14 Lower surface of leaflet cinereous-villosulous, the hairs largely obscuring the glands; seeds brown
............ ............ ..14 Lower surface of leaflet inconspicuously puberulent, the yellow glands evident; seeds red or red-and-black.
............ ............ ....15 Leaflets (4-) 6-8 cm long; seeds red and black; legume 9-12 mm wide
............ ............ ....15 Leaflets 2-4 (-6) cm long; seeds red; legume 5-8 mm wide
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