Flora of North America species comparison

1–5, terminal from caudex, erect or nearly so.

1–10, ascending to erect, simple or few-branched.

cauline, ± evenly spaced;

blade widely ovate to elliptic, 1.5–4 cm × 8–22 mm, apex obtuse.

basal and cauline;

cauline ± evenly spaced;

basal blades elliptic to obovate, 0.5–1.2 cm × 2–8 mm, apex obtuse;

cauline blades ovate to lanceolate, 0.3–1.2 cm × 2–6 mm, apex obtuse to acute.

solitary flowers or occasionally a terminal pair.

solitary flowers at ends of main axis and branches and in axils, branches of largest plants thus forming cymes.

calyx 8–12 mm, tube cleft to base or nearly so into 2 spathaceous segments, lobes elliptic to ovate-lanceolate, 0.5–5 mm, margins not ciliate;

corolla bright blue, campanulate, open, 30–38 mm, lobes widely ovate-triangular, 6–11 mm, free portions of plicae spreading, low-triangular, less than 1 mm, notched at apex, otherwise entire;

anthers distinct.

calyx (8–)11–16 mm, lobes linear-lanceolate, 2–6 mm, margins not ciliate;

corolla deep blue or occasionally white, salverform, open, (11–)17–25 mm, lobes spreading, ovate-elliptic, 3–6 mm, plicae small, ± triangular, distally bifid;

anthers distinct.

not winged.

not winged.

 = 14 (Iceland, Europe).