Flora of North America species comparison

usually 1.

1–several, with several rosettes, puberulent.

blades white-margined;

basal linear-lanceolate to narrowly oblanceolate, 5–20 × 0.7–2(–3) cm;

cauline leaves opposite, distal blades lanceolate.

blades narrowly white-margined, glabrous or abaxial surfaces puberulent proximally;

basal narrowly oblanceolate, 1.4–14 × 0.2–0.7 cm, basal leaves usually shorter than lowest internode;

cauline leaves opposite, distal blades nearly linear.

diffuse.

narrow, 1.5–4 cm wide, ± continuous throughout or interrupted proximally.

calyx 3–6 mm;

corolla greenish white to greenish yellow, dark green- or purple-dotted, 7–12 mm, lobes elliptic-ovate, apex abruptly acuminate;

androecial corona ± fringed;

style slender, distinct;

nectaries 2 per lobe, in closely paired, ± separate foveae, foveae opening distal to nectaries, into a single widely ovate-triangular differentiated area on the corolla surface shaped ± like the spade on playing cards, rim ± sparsely short- to long-fringed.

calyx 4–8 mm;

corolla white or slightly suffused with blue, dark blue-dotted, abaxially with a green central stripe, 6–9 mm, lobes proximally oblong, distally triangular, apex acuminate;

corona scales deeply cleft into distally threadlike segments, 2 mm;

style slender, distinct;

nectaries and foveae 1 per lobe, fovea narrowly oblong, opening into an oblong differentiated area on the corolla surface, rim fringed all around but fringes shorter distally.