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 dark green, ovate to oblong-elliptic, 13–25 × 8–14 mm, margins entire, surfaces puberulent or glabrous abaxially, glabrous adaxially.

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 spreading, distinct, broadly ovate, 0.4–0.6 mm, glabrous;

corolla pink, bronze, or yellowish green, globose to urceolate, 4–6 × 3–5 mm, thin, glaucous;

filaments glabrous.

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

red, sometimes faintly glaucous, translucent, 7–10 mm diam.

ca. 1 mm.

ca. 1 mm.

= 24, 48.

= 24.