Flora of North America species comparison

petiole 3–10 mm;

blade flat to cupped, elliptic to ovate, 10–40(–50) × 5–15(–20) mm, base obtuse to rounded, margins denticulate to serrulate, usually not revolute, sometimes incompletely revolute, teeth glandular, 23–48, apex obtuse, abaxial surface pale green, sparsely puberulent to villosulous or glabrate, veins prominently raised, puberulent to villosulous, adaxial surface dark green, glabrate; 3-veined from base.

petiole 6–25 mm;

blade not aromatic, flat, ovate, ovate-elliptic, or widely elliptic, 25–100 × (17–)20–60 mm, herbaceous, not resinous, base rounded or subcordate, margins serrulate, teeth 50–100+, apex acute to rounded, abaxial surface pale green, glabrous or puberulent, especially on veins, adaxial surface green, dull, glabrate; 3-veined from base.

terminal, usually racemelike, rarely paniclelike, 2.5–9 cm.

axillary, paniclelike, cylindric, 5–12 cm.

sepals, petals, and nectary usually pale to deep blue, rarely white.

sepals and petals usually white to cream, sometimes pink-tinged;

nectary cream.

3–4 mm wide, weakly lobed;

valves smooth, viscid, not crested.

4–5 mm wide, weakly lobed near apex;

valves smooth, usually not crested, sometimes weakly crested.

= 24.