Flora of North America species comparison

usually canescent, sometimes glabrescent.

usually villous-pubescent, 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 22 × 16 cm, margins entire or irregularly sinuate-dentate, surfaces villous to glabrescent, (trichomes spreading, often more dense along veins, sometimes glandular).

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 villous along veins, hairs spreading, tube cylindric, 5-toothed;

corolla white, sometimes lavender- or purple-tinged, funnelform, 10–22 cm, sparsely hairy, glabrescent, acuminate lobes alternating with lobules of similar size.

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

calyx remnant slightly accrescent.

pendent, irregularly dehiscent, pericarp fleshy, hairy, with prickles 10 mm;

calyx remnant slightly accrescent.

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

caruncle present.

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

caruncle present.

= 24.

= 24.