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Strophostyles
See list of 3 species in this genusReference: Riley-Hulting et al. (2004).
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1a. Legumes permanently pubescent, (12.2–) 20–40.7 mm long; peduncles slender, herbaceous, 0.2–0.7 mm thick; corollas 3.6–7 (–8.3) mm long; keel petals mostly concealed by wing petals, only a short segment of the slightly curved beak exposed; basal, connate portion of calyx pubescent; seeds glabrous
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1b. Legumes glabrate at maturity, (26–) 30–96 mm long; peduncles stout, ligneous, 0.8–1.3 mm thick; corollas 8–15 mm long; keel petals with a long, curved beak that protrudes well beyond the wing petals; basal, connate portion of calyx glabrous or essentially so; seeds pubescent
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2a. Bracteoles 1.5–4.2 mm long, lanceolate, acute at the apex, usually as long as or longer than the basal connate portion of the calyx; leaflets frequently with a lobe on one or both margins, the terminal one 25–36 mm wide and 1.5–3 times as long as wide; beak of keel petals slender, ca. 1 mm in diameter at the base, projecting away from the banner petal
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2b. Bracteoles 0.8–2.4 mm long, ovate to oblong, blunt, usually shorter than the basal, connate portion of the calyx; leaflets usually lacking lobes, but the margins sometimes sinuate, the terminal one 3–20 mm wide and 2.2–8 (–10) times as long as wide; beak of keel petals stouter, 1.5–2 mm in diameter at the base, oriented to be closely associated with the banner petal
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Each photo represents one species in this genus.