Flora of North America species comparison

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

(from short rhizomes) single, branched distally, puberulent.

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.

opposite;

subsessile or petiolate;

blades palmately 3(–5)-lobed (at least larger proximal, lobes relatively broad), blades (or lobes) lanceolate to lance-ovate, 50–100 × 20–40 mm, margins serrate, apices rounded to acute, faces puberulent, gland-dotted.

5;

corollas 2–2.5 mm.

(4–)5(–6);

corollas (usually pinkish) 2–2.5 mm.

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).

8–10 in 2–3 series, oblong, 4.5–6 × 1.5–2 mm, apices rounded, abaxial faces puberulent, gland-dotted.

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

in dense, corymbiform arrays.

1–1.5 mm;

pappi of 15–30 bristles 2–2.5 mm.

2–3 mm;

pappi of 20–30 bristles 3–5 mm.

= 20.

= 20.