Flora of North America species comparison

erect, rarely ascending, (15–)30–70(–100) cm, eglandular-hairy, hairs evenly distributed around stem.

erect or ascending, (2.5–)4–25(–35) cm, glabrous or densely glandular-hairy.

blade ovate or oblong-ovate, rarely lanceolate, (20–)30–55(–70) × (6–)15–25(–45) mm, 2–3(–4) times as long as wide, base ± cordate, margins dentate to serrate to crenate-incised, rarely subentire, apex acute, abaxial surface hairy, adaxial glabrous.

blade oblanceolate proximally, narrowly oblong distally, 5–28(–35) × 2–6(–10) mm, 3–10 times as long as wide, base cuneate, margins entire or dentate distally, apex acute, surfaces glabrous or densely glandular-hairy.

2–4(–8), axillary, 60–150 mm, 50–150-flowered, axis hairy;

bracts linear-lanceolate to linear, 4–8(–14) mm.

1, terminal, sometimes 1 or 2 axillary, 20–200 mm, (2–)5–40-flowered, axis glabrous or densely glandular-hairy;

bracts spatulate to linear-lanceolate, 3–22 mm.

erect, 3–7(–14) mm, equal to subtending bract, eglandular-hairy.

erect, 0.2–1(–2) mm, much shorter than subtending bract, glabrous or densely glandular-hairy.

calyx 5-lobed, abaxial lobes 3–4 mm, adaxial 1–1.5 mm, apex acute, glabrous or hairy;

corolla bright blue, rarely pinkish or white, (9–)12–18 mm diam.;

stamens 4.5–6 mm;

style 5–6 mm.

calyx lobes (2–)3–6 mm, 0.9–2 mm wide, apex obtuse to acute, glabrous or densely glandular-hairy;

corolla white or pale pink, 2–5 mm diam.;

stamens 1 mm;

style 0.1–0.5 mm.

± compressed to ± round in cross section, broadly obovoid or obcordiform, (3–)4–5.5 × (2.5–)3.5–5 mm, apex not deeply, narrowly emarginate, glabrous or sparsely hairy.

strongly compressed in cross section, obcordiform, 2.5–5 × 2.5–6 mm, apex ± emarginate, glabrous.

(2–)8–18, brown, widely ellipsoid to widely obovoid, flat, 1.2–2.1 × 1–1.5 mm, 0.2–0.4 mm thick, smooth.

12–140, yellow or pale brown, oblong, flat, 0.6–1.6 × 0.4–0.9 mm, 0.1–0.2 mm thick, smooth.

= 48, 64 (Europe).

= 52.