Flora of North America species comparison

ascending, usually with 4–10 nodes, 5–45(–60) cm, proximally eglandular- or glandular-hairy, sometimes glabrous, distally eglandular- and, usually, glandular-hairy.

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

blade ovate-oblong to narrowly oblong-lanceolate, (30–)40–70(–80) × 5–20 mm, base long-cuneate, margins shallowly crenate to shallowly serrate to subentire, apex obtuse to rounded, surfaces densely glandular- or eglandular-hairy, rarely glabrate.

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(–7), terminal, sometimes with lateral ones, (50–)70–130(–170) mm, (50–)100–300-flowered, axis eglandular- and glandular-hairy;

bracts oblong to lanceolate, 3–5 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.

suberect to patent, 0.5–1(–2) mm, shorter than subtending bract, eglandular- and glandular-hairy.

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

calyx lobes 2–3 mm, ciliate, apex obtuse, glandular-hairy, rarely eglandular-hairy;

corolla blue, campanulate, longer than wide, 5–6 mm diam., lobes 3–4.5 × 1.5–2 mm;

stamens 5 mm;

style 8 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 ovoid, 2–3 × 2–3 mm, apex obtuse, densely glandular-puberulent.

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

3–40, light brown, ellipsoid, flat, 0.6–1.2 × 0.5–0.8 mm, 0.2–0.4 mm thick, smooth.

(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.

= 34, 68 (Europe).

= 16, 32 (Eurasia).