Flora of North America species comparison

deciduous;

blade dark to pale green or glaucous, elliptic to narrowly elliptic, 15–41 × (5–)6–16(–20) mm, margins usually sharply, uniformly serrate (serrations sometimes minute, tipped with stipitate gland), surfaces glabrous or hairy, especially along abaxial midvein, eglandular abaxially.

deciduous;

blade green, elliptic, 23–35 × 8–16 mm, membranous to subcoriaceous, margins entire, surfaces ± densely hairy (sometimes mostly on veins), eglandular, sometimes glabrescent.

calyx green, glaucous, glabrous;

corolla usually white, cylindric to urceolate, 4–6 mm;

filaments ciliate; (tubules with introrse, elongate pores).

calyx green, glabrous, (eglandular);

corolla greenish white to pink, urceolate, 3–5 mm, (eglandular);

filaments usually hairy.

black or blue, rarely white, 3–12 mm diam., glabrous.

blue, glaucous, 6–8 mm diam., glabrous.

(3–)10–15(–20), ca. 1.2 mm.

10–40, ca. 1 mm.

= 48.

= 24.