Flora of North America species comparison

puberulent, sometimes glabrescent.

usually canescent, sometimes glabrescent.

blades broadly ovate, to 13 × 8 cm, margins usually sinuate-dentate, sometimes pinnately lobed, surfaces glabrescent.

blades ovate, to 22 × 16 cm, margins entire or irregularly sinuate-dentate, abaxial surface canescent (especially along veins), hairs appressed or curved, sometimes glandular, adaxial surface puberulent to glabrescent.

calyx with minute pubescence along veins, tube cylindric, 5-toothed;

corolla white, trumpet-shaped, 4–6 cm, acuminate lobes alternating with sinuses.

calyx canescent along veins, tube cylindric, 5-toothed;

corolla white, sometimes tinged pale lavender, broadly funnelform, usually puberulent along veins, 14–26 cm, acuminate lobes alternating with smaller lobules.

erect, dehiscent by 4 valves, pericarp dry, sparsely hairy, with prickles unequal, some 15+ mm, proximals shorter than distals;

calyx remnant not accrescent.

pendent, irregularly dehiscent, pericarp fleshy, puberulent, with prickles usually less than 10 mm;

calyx remnant slightly accrescent.

black, 4–4.5 mm, convex marginal ridge absent, testa rugose;

caruncle absent.

brown, 4–6 mm, convex marginal ridge present, testa smooth;

caruncle present.

= 24.

= 24.