Flora of North America species comparison

blades pale green or glaucous abaxially, slightly darker pale green adaxially, ovate to elliptic, rarely obovate, 25–39 × 16–20 mm, margins entire to obscurely serrate, abaxial surface glabrous, eglandular (sometimes hairy or glandular along midvein), adaxial surface usually glabrous (sometimes hairy and/or glandular).

blades usually green, broadly elliptic to ovate, 25–50 × 11–23 mm, margins sharply serrate, surfaces glandular abaxially.

calyx pale green or glaucous, lobes vestigial or absent, glabrous;

corolla pink, bronze-pink, or greenish white, globose, sometimes urceolate, 5–7 × 4–5 mm, thin, glaucous;

filaments glabrous or pilose basally.

calyx green, obscurely lobed, glabrous;

corolla white, cream, yellowish pink, or bronze, globose to urceolate, 3–5 × 5–7 mm, thin, glaucous;

filaments glabrous.

blue, dull purplish black, or black, sometimes glaucous, 8–10 mm diam.

shiny or dull black or deep purple, rarely red or white, 9–13 mm diam.

ca. 1 mm.

ca. 1 mm.

= 24, 48.

= 48.