Flora of North America species comparison

persistent.

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.

terminal, racemes, on lateral twigs, on previous year’s shoots or older woody stems.

articulated with calyx tube.

sepals 5;

petals 4–5, connate for nearly their entire lengths, corolla cylindric or urceolate;

stamens 10, included;

anthers ± without awns, tubules 1–1.5 mm, with terminal pores.

calyx green, glaucous, glabrous;

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

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

[4-], 5-, [pseudo 8-, or pseudo 10]-locular.

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

10–25, (ca. 1 mm).

(3–)10–15(–20), ca. 1.2 mm.

= 48.