Flora of North America species comparison

1–few, with several rosettes.

generally 1, with 0–few rosettes.

blades narrowly white-margined;

basal oblanceolate, 4–23 × 0.3–1.2(–2) cm, basal leaves generally longer than lowest internode;

cauline leaves opposite, proximal blades oblanceolate to oblong, distal linear-oblong.

blades white-margined;

basal oblanceolate, 2–9 × 0.3–1(–1.5) cm, apex abruptly pointed;

cauline leaves whorled, distal blades linear-oblong.

narrow, 1.5–4(–5) cm wide, interrupted proximally, ± continuous distally.

elongate, dense, branching near base of main stem, nearly continuous distally.

calyx 3–7(–12) mm;

corolla greenish white to pale or medium blue, usually dark blue- to purple-dotted and/or with a dark blue, purple, or green central stripe (except in var. idahoensis), 6–12 mm, lobes oblong-obovate-elliptic, widest near midlength, abruptly tapering to acute to short-acuminate apex;

androecial corona scales present, variable among the varieties;

style slender, distinct;

nectaries and foveae 1 per corolla lobe, foveae distal to nectary, opening into an elliptic-oblong to lance-ovate differentiated area on the corolla surface, rim fringed all around but with fringes shorter distally, or not fringed toward distal end.

calyx 6–11 mm;

corolla white to pale blue, veins darker, campanulate, 8–13 mm, lobes elliptic-oblong to obovate, apex short-acuminate;

androecial corona scales narrowly oblong, 2–3 mm, margins fringed;

style slender, distinct;

nectaries and foveae 1 per corolla lobe, foveae round at base, opening directly adaxial to nectary, without a differentiated area on the corolla surface, rim prolonged into an appendage ca. 3 mm, proximally tubular, dividing distally into 2 oblong, fringed lobes.