Flora of North America species comparison

usually 1.

1–several.

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;

basal oblanceolate or narrowly obovate to elliptic-oblong, 2–12 × 0.6–2.2 cm;

cauline leaves opposite or rarely some whorled, distal blades oblong to lanceolate.

diffuse.

diffuse, branching near base of main stem.

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 5–12 mm;

corolla greenish white, copiously blue-purple-dotted, 7–13 mm, lobes oblong-obovate, apex abruptly acuminate;

androecial corona poorly developed, ± fringed;

style slender, distinct;

nectaries 2 per corolla lobe in a single, basally 2-lobed fovea, fovea opening distal to nectaries, into a single differentiated area on the corolla surface that is oblong to elliptic, ± widened at distal end, proximal side of rim prolonged into a scale 2 mm, fringed ± 1/2 its length, distal side of rim long-fringed.