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 pale green abaxially, elliptic, lanceolate, or ovate-lanceolate, 7–11 × 4–6 mm, margins finely serrulate, surfaces glabrous.

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 pale green, lobes vestigial, glabrous;

corolla pink, globose to urceolate, 3–4 × 3–4 mm, thin, glaucous;

filaments glabrous.

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

red, ± translucent, or bluish purple, 4–6 mm diam.

ca. 1 mm.

ca. 1 mm.

= 24, 48.