Flora of North America species comparison

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

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

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.

 = 14 (Iceland, Europe).