Flora of North America species comparison

creeping to decumbent, 10–50(–60) cm, eglandular-hairy.

ascending, rarely erect, (7–)10–30(–50) cm, densely eglandular-hairy, hairs along stem in 2 prominent lines.

blade suborbiculate, broadly ovate, or broadly lanceolate, (6–)9–18(–30) × (5–)8–15(–20) mm, base truncate, margins serrate, apex acute, surfaces sparsely eglandular-hairy.

blade narrowly ovate to ovate-orbiculate, (10–)12–30(–42) × (6–)10–22(–30) mm, 1–2 times as long as wide, base truncate to ± cordate, margins crenate to deeply incised, apex obtuse, surfaces variably hairy.

1–6, terminal, 100–500(–600) mm, 5–30-flowered, axis eglandular-hairy;

bracts suborbiculate or broadly ovate or broadly lanceolate, (6–)9–18(–25) mm.

1–4, axillary, 40–100(–200) mm, 15–40(–60)-flowered, axis eglandular-hairy, sometimes also glandular-hairy;

bracts linear-elliptic, 3–7 mm.

spreading, deflexed in fruit, (12–)15–27(–38) mm, length 1–2(–3) times subtending bract, densely eglandular-hairy.

suberect, (3–)5–8(–10) mm, equal to or shorter than subtending bract, eglandular- and glandular-hairy.

calyx lobes (4.5–)5.5–8(–9.5) mm, (1.7–)2.4–3.6(–4.2) mm wide, apex acuminate, eglandular-hairy;

corolla intense bright blue, 8–14 mm diam.;

stamens 1.2 mm;

style (1.5–)2–2.8(–3.2) mm.

calyx 4-lobed, lobes 2–8 mm, apex acute, eglandular- and, sometimes, glandular-hairy;

corolla blue obscure darker nerves and sometimes whitish margin, (6–)10–14(–17) mm diam.;

stamens 4.5–6.5 mm;

style (2.5–)4–5 mm.

compressed in cross section, broadly obcordiform, 4–6 × (5–)6–8.5(–9.5) mm, apex acute, sinus angle (80–)90–120(–150)°, reticulate with prominent veins, ± sparsely to densely eglandular- and/or glandular-hairy or glabrate.

strongly compressed in cross section, obcordiform to obdeltoid, (2–)3.5–4(–5) × (3.5–)4–5(–5.5) mm, apex ± emarginate, eglandular-hairy.

(10–)12–18(–20), pale brownish yellow, ellipsoid to globular, cymbiform, (1.3–)1.4–2.3(–2.5) × (0.8–)0.9–1.6(–1.9) mm, 0.5–1 mm thick, cristate-rugose.

(2–)12–20(–28), yellow, ellipsoid, flat, 1.1–1.7 × 0.6–1.5 mm, 0.2–0.4 mm thick, smooth to subrugose.

= 28.

= 16, 32 (Eurasia).