Flora of North America species comparison

(from short caudices) single, sparsely to densely branched distally, pubescent throughout (sometimes reddish to purplish).

(from short caudices) single, branched distally, glabrous throughout, gland-dotted.

opposite; petiolate (petioles 10–25 mm);

blades ± 3-nerved, lanceolate, 20–90+ × 5–40 mm, bases rounded to slightly oblique, margins entire or serrate, apices acute, faces puberulent, gland-dotted.

opposite (proximal) or alternate (nodes often appearing leafy by development of leaves on lateral buds without axis elongation); petiolate or sessile;

blades (usually pinnately or ternately lobed) or lobes 1-nerved or pinnately nerved, linear, 20–100 × 0.2–0.5(–1) mm, bases slightly expanded, margins entire, apices rounded to acute, faces sparsely puberulent to glabrate, gland-dotted.

9–15;

corollas 2.5–3 mm.

5;

corollas 2–2.5 mm.

8–12 in 1–2 series, elliptic to oblong, 1–3 × 0.5–1 mm, apices slightly rounded to acute, abaxial faces puberulent, gland-dotted.

6–10 in 1–2 series, lanceolate, 1.5–3 × 0.5–0.7 mm, apices acuminate, mucronate, abaxial faces glabrous or glabrate (not gland-dotted).

in corymbiform arrays.

in paniculiform arrays (branches supporting heads recurved, secund).

1–1.5 mm;

pappi of 20–30 bristles 2–2.5 mm.

1–1.5 mm;

pappi of 15–30 bristles 2–2.5 mm.

= 20.

= 20.