Flora of North America species comparison

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

prostrate to erect, unbranched, (3–)5–15(–20) cm, viscid-hairy.

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.

blade elliptic-ovate, 20–45 × 15–30 mm, 1–3 times as long as wide, base cuneate, margins ± crenate-serrate, apex acute to rounded, abaxial surface with articulate hairs or glabrous, adaxial hirsute, or surfaces sparsely ciliate only.

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.

1–4, axillary, 50–150 mm, 3–8-flowered, axis viscid-hairy;

bracts oblong, 3–5 mm.

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

suberect, 8–10 mm, longer than subtending bract, viscid-hairy.

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.

calyx lobes 4 mm, apex obtuse, hairy;

corolla bright blue to violet-blue, 8–9 mm diam.;

stamens 7 mm;

style 7–9 mm.

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

compressed in cross section, obovoid, 9–11 × 7–8 mm, apex emarginate, sparsely hairy.

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

unknown.

= 52.

= ca. 48–50 (Russia).