Flora of North America species comparison

ascending, often dark bluish distally, sparsely branched at base, 5–15(–25) cm, eglandular-hairy.

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

blade ovate or oblong-elliptic, 7–30 × 4–20 mm, base cuneate, margins indistinctly dentate or entire, apex short-acuminate, abaxial surface glabrate, adaxial ± hairy.

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.

1, terminal, 5–20 mm, to 30 mm in fruit, (1–)3–20-flowered, axis eglandular-hairy;

bracts oblanceolate, 4–5 mm.

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.

ascending to erect, 1.5–2(–4) mm, shorter than subtending bract, eglandular-hairy.

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

calyx lobes 3–4 mm, ciliate, apex obtuse or acuminate, eglandular-hairy;

corolla sky blue or blue-violet, sometimes white, rotate, 2.5–5.5 mm diam.;

stamens 2–2.3 mm;

style 0.5–1.5(–2) mm.

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.

compressed in cross section, obovoid or oblong-obovoid, 4.5–7.5 × 3.5–5.5 mm, ca. as long as wide, apex shallowly emarginate, eglandular-hairy or glabrate.

± compressed in cross section, broadly ovoid, 2–3 × 2–3 mm, apex obtuse, densely glandular-puberulent.

9–53, brown to yellow, ellipsoid-oblong, flat, 0.7–1.2 × 0.4–1 mm, 0.1 mm thick, smooth.

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

= 18.

= 34, 68 (Europe).