Flora of North America species comparison

creeping, 5–50 cm, eglandular- and glandular-hairy.

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

blade suborbiculate, 4–13 × 4–14 mm, base cordate, margins crenate-serrate, teeth (2 or)3–5(or 6) per side, apex rounded, surfaces sparsely eglandular- and/or 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.

1–6, terminal, 50–500 mm, 10–20-flowered, axis sparsely eglandular- and/or glandular-hairy;

bracts suborbiculate, 4–13 mm.

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

bracts oblong, 3–5 mm.

patent or recurved, (15–)20–30 mm, length 2–5 times subtending bract, eglandular- and glandular-hairy.

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

calyx lobes 4–7 mm, 1.5–2.5 mm wide, apex rounded, sparsely glandular-hairy to glabrate;

corolla blue-violet to pale blue and white, 8–14 mm diam.;

stamens 2.1–2.5 mm;

style 3–4 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.

compressed in cross section, subglobular, 3.5–5 × 5.5–6.5 mm, apex emarginate, sinus angle 50–90°, absent or almost smooth, glabrous or glandular-ciliate.

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

(2–)6–14(–18), ochre, ovoid, flat to ± excavate, 1.3–1.7 × 1–1.3 mm, 0.6–0.8 mm thick, rugose to rugulose.

unknown.

= 14 (Europe).

= ca. 48–50 (Russia).