Flora of North America species comparison

mostly cauline at flowering;

sessile or petiolate, petioles ± winged (often clasping at bases);

blades mostly obovate to oblanceolate, spatulate, or linear, bases cuneate, margins usually toothed (rarely entire), apices obtuse to acute, abaxial faces usually resin-gland-dotted.

± cylindric to fusiform, 2–3+ mm diam.

(2–)4(–5+);

corollas white or pink to purple, tubes longer than abruptly funnelform throats, lobes 5, lance-linear, unequal (abaxial sinus deepest).

8 in 4 decussate pairs, the outer ovate, inner lanceolate, all ± chartaceous, margins entire, tips ± spinose or cuspidate (abaxial faces of inner 4 usually resin-gland-dotted distally).

± discoid, sessile, not individually bracteate, in clusters of 1–5+ in spiciform or paniculo-spiciform arrays 5–10 mm diam., each cluster subtended by 1–2 lanceolate to spatulate or linear bracts.

± clavate, sometimes ± flattened, 8–10-nerved or -ribbed, closely strigillose to hirsutulous;

pappi persistent, of 6–10 ± laciniate to aristate scales, 2(–3+) of aristate scales each with awnlike arista plicate (2-folded) distally.

= 14?.