Flora of North America species comparison

usually canescent, sometimes glabrescent.

usually hairy, sometimes glabrous.

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.

blades ovate, to 18 × 16 cm, margins entire or dentate, abaxial surface hairy, adaxial surface glabrous.

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.

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

corolla white throat with purple ring, trumpet-shaped, 8–15 cm, acuminate lobes alternating with larger lobules.

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

calyx remnant slightly accrescent.

pendent, regularly dehiscing by 4 valves, pericarp dry, hairy, with prickles to 3.2 cm;

calyx remnant accrescent (sometimes reflexed).

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

caruncle present.

black, 3–4.5 mm, convex marginal ridge absent, testa rugose;

caruncle present.

= 24.

= 24.