Flora of North America species comparison

creeping to decumbent, 5–25 cm, hairy.

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

blade elliptic-ovate to oblong, (6–)8–16(–19) × (3–)4–10(–13) mm, base truncate, margins serrate, teeth 4–6(–8) per side, apex obtuse to acute, abaxial surface ± more densely hairy than adaxial.

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.

1–5, terminal, 50–250 mm, 5–15-flowered, axis eglandular-hairy, sometimes glandular-hairy;

bracts elliptic-ovate to oblong, (6–)9–16(–19) mm.

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

bracts oblanceolate, 4–5 mm.

deflexed, (5–)6–10(–15) mm, ± shorter than subtending bracts, densely eglandular- and, sometimes, glandular-hairy distally.

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

calyx lobes linear-lanceolate, (5–)6–7 mm, 2.2–2.6 mm wide, apex rounded, sparsely eglandular- or glandular-hairy;

corolla white or pale pinkish or pale blue, 4–5(–6) mm diam.;

stamens 0.5–1 mm;

style (0.6–)0.9–1.1(–1.2) mm.

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.

± compressed in cross section, ± subglobular, 3.5–4.5(–4.7) × 4.5–6(–6.3) mm, apex emarginate, sparsely glandular-hairy.

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.

6–14, yellow to ochre, globular, cymbiform, 1.3–2.1 × 1–1.6 mm, 0.6–1.1 mm thick, strongly rugose (transversely ribbed).

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

= 28 (Europe).

= 18.