Flora of North America species comparison

erect, (1–)2–10(–18) cm, eglandular-hairy.

creeping to decumbent, 5–20(–40) cm, eglandular-hairy.

blade ovate to lanceolate-ovate, (3–)4–12(–20) × (1–)2–6(–12) mm, base cuneate, margins remotely serrate, rarely dentate, apex acute, surfaces glabrate.

blade suborbiculate to ovate, rarely oblong-ovate, (3–)6–11(–14) × (3–)4–9(–10) mm, base truncate, margins serrate to dentate, teeth 2–4 per side, apices usually rounded, apex acute to obtuse, abaxial surface densely hairy, adaxial sparsely hairy to glabrate.

1–8, terminal, 20–80 mm, 5–15(–30)-flowered, axis eglandular- and glandular-hairy;

bracts lanceolate, 6–9 mm, margins entire, apex acute.

1–4, terminal, 50–200(–400) mm, 5–20-flowered, axis sparsely to densely hairy or glabrate;

bracts suborbiculate to ovate, (3–)6–11(–14) mm.

straight or scarcely deflexed, erect-spreading to horizontally spreading in fruit, (2–)3–8(–11) mm, shorter than subtending bract, eglandular-hairy, sometimes glandular-hairy, rarely glabrous.

usually semicircularly recurved, (3–)6–13(–15) mm, 0.5–1.5 times subtending bract, densely eglandular-hairy.

calyx lobes (3–)4–7(–9) mm, margins entire, apex acuminate-acute, pairs connate 0.5–1.5 mm, puberulent or glabrate;

corolla pale to clear blue, 2–4 mm diam.;

stamens 1–2 mm;

style 0.4–0.8(–2) mm.

calyx lobes broadly ovate, (3–)4–6(–7) mm, 2.6–3.8 mm wide, apex acute, eglandular-hairy, rarely glandular-hairy;

corolla intense dark to bright blue, rarely pale lilac or white, with darker nerves, abaxial 1/2 often brighter to whitish, (3–)4–7(–8) mm diam.;

stamens 0.5 mm;

style (0.5–)1–1.6(–1.8) mm.

slightly compressed in cross section, obcordiform, (2.4–)2.8–4(–4.5) × (3–)3.5–5(–6) mm, apex emarginate, eglandular- and/or glandular-hairy, rarely glabrous.

± round in cross section, obcordiform, (2.5–)3–4(–4.5) × (3.5–)4–6(–6.3) mm, apex emarginate, sinus angle 20–60(–80)°, densely eglandular-hairy, sometimes also glandular-puberulent, rarely glabrous.

(2–)4–6(–10), bright yellow, oblong, cymbiform, (1.4–)1.7–2(–2.2) × (0.7–)1–1.3 mm, 0.7 mm thick, smooth.

(7–)16–24(–30), pale yellow, ellipsoid to ovoid, deeply cymbiform, 0.9–1.6 × (0.5–)0.8–1.3 mm, 0.4–0.8 mm thick, rugose-cristate.

= 28 (Asia).

= 14 (Eurasia).