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1 Corollas usually greater than 10 cm long, limb with 5 lobules alternating with acuminate lobes; fruits pendent; [section Dutra].
......4 Plants perennial, often with woody base; leaves and stems glabrescent; corollas white, purple, or yellow, with single, double, or triple whorls; fruits spineless, pericarp tuberculate
......4 Plants perennial, with herbaceous base; leaves and stems pubescent; corollas white (sometime purple-tinged), with a single whorl; fruits with spines, pericarp pubescent.
........5 Corolla limbs with 5 acuminate lobes +/- equal to 5 lobules; calyces villous-pubescent (especially along veins); abaxial leaf surface villous-pubescent (especially along veins), trichomes spreading
........5 Corolla limbs with 5 acuminate lobes longer than the 5 lobules; calyces canescent-puberulent (especially along veins); abaxial leaf surface canescent-puberulent (especially along veins), trichomes short-appressed or curved