Flora of North America species comparison

usually canescent, sometimes glabrescent.

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 narrowly ovate to lanceolate, to 15 × 8 cm, margins sinuate to pinnately lobed, abaxial surface tomentose, 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 glabrous, tube split along 1 side, appearing spathe-like and with poorly defined unequal teeth;

corolla white with red-purple hues, trumpet-shaped surface usually waxy, 11.5–20 cm, acuminate lobes alternating with smaller lobules.

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

calyx remnant slightly accrescent.

pendent, irregularly dehiscent, pericarp fleshy, glabrous, without prickles or tubercles;

calyx remnant not accrescent.

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

caruncle present.

black, 3.5–5 mm, convex marginal ridge absent, testa finely pitted;

caruncle present.

= 24.

= 24.