Flora of North America species comparison

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

erect to ascending, unbranched, (5–)10–20(–25) cm, eglandular-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 ovate, 15–30 × 10–20 mm, base rounded, margins dentate or serrate, apex subacute to subobtuse, surfaces eglandular-hairy.

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

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

1, terminal, 10–60 mm, to 100 mm in fruit, 5–15-flowered, axis hairy;

bracts lanceolate, 2–5 mm.

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

erect, 2–11 mm, equal to longer than subtending bract, crisp-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 4–5 mm, eglandular-ciliate, apex acuminate, glabrous or sparsely hairy;

corolla pale blue or violet, rotate, 8–10 mm diam.;

stamens 7 mm;

style 3–6 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.

compressed in cross section, oblong, 5–6(–8) × 3–4.5 mm, longer than wide, apex ± emarginate, glabrous proximally, hairy distally.

(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.

number unknown, brown, ovoid, flat, 1–1.5 × 0.7–1.2 mm, thickness and texture unknown.

= 48, 64 (Europe).

= 18 (Japan, Russia).