Flora of North America species comparison

ascending to erect, 30–150 cm, glabrous or retrorsely hairy, hairs pointed, rarely glaucous.

ascending to erect, 5–15(–23) cm, retrorsely hairy or puberulent, hairs pointed.

essentially cauline, basal absent or essentially so, opposite, glabrous or retrorsely hairy to puberulent, hairs pointed, rarely glaucous;

cauline 5–11 pairs, petiolate or sessile, 10–100 × 0.5–12 mm, blade oblanceolate to lanceolate or linear, base tapered to clasping, margins entire, apex acute.

not leathery, puberulent proximally, hairs pointed, sometimes only along margins, glabrous distally;

cauline 2–7 pairs, petiolate or sessile, 7–17(–25) × 0.7–1.3(–1.7) mm, blade linear, rarely oblanceolate, base tapered, apex acute to mucronate.

interrupted or continuous, cylindric, (6–)10–32 cm, axis glabrous or retrorsely hairy, verticillasters (3–)5–14, cymes 1(–3)-flowered, (1 or)2 per node;

proximal bracts lanceolate to linear, 5–65 × 0.5–5 mm;

peduncles and pedicels ascending to erect, glabrous or retrorsely hairy.

continuous, secund, 2–8 cm, axis retrorsely hairy, hairs pointed, and, sometimes, sparsely glandular-pubescent, verticillasters 2–10, cymes 1–3(or 4)-flowered, 1(or 2) per node;

proximal bracts linear, 11–21 × 1–1.4 mm;

peduncles and pedicels ascending to erect, retrorsely hairy, hairs pointed, and, sometimes, sparsely glandular-pubescent.

calyx lobes obovate to oblanceolate or ovate to lanceolate, 2.6–6(–7) × 1.3–3.3 mm, glabrous or puberulent;

corolla blue to violet or purple, without nectar guides, ventricose to ventricose-ampliate, 24–38 mm, glabrous externally, glabrous internally, tube 7–10 mm, throat gradually inflated, 8–11 mm diam., 2-ridged abaxially;

stamens included or longer pair reaching orifice or slightly exserted, filaments glabrous, pollen sacs parallel, 2.2–3 mm, distal 1/3–1/2 indehiscent, sides pubescent to lanate, hairs white, to 0.8 mm near filament attachment, sutures denticulate, teeth to 0.2 mm;

staminode 16–19 mm, included, 0.4–0.6 mm diam., glabrous;

style 18–27 mm.

calyx lobes lanceolate, 4–5.5 × 1–1.6 mm, broadly scarious-margined, apex acuminate to caudate, sparsely glandular-pubescent, sometimes glabrate;

corolla blue to bluish violet, lined internally abaxially with reddish violet nectar guides, funnelform, 12–15(–18) mm, glabrous or sparsely white-villous internally abaxially, tube 5–6 mm, throat gradually inflated, 6–7 mm diam., 2-ridged abaxially;

stamens: longer pair reaching orifice or exserted, filaments glabrous, pollen sacs widely divergent or opposite, navicular, 0.8–1.1 mm, sutures papillate;

staminode 6–8 mm, included, flattened distally, 0.3–0.4 mm diam., tip straight to recurved, distal 6–7 mm densely pilose, hairs golden yellow, to 1.1 mm;

style 11–13 mm.

6–9 × 4–5 mm.

4.5–7 × 2.8–3.5 mm.

= 16, 32.