Flora of North America species comparison

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

(from short caudices) single, densely branched distally, puberulent throughout.

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 (proximal) or alternate (nodes often appearing leafy, lateral buds develop leaves without axis elongation);

sessile;

blades (usually 1–2-pinnately or ternately lobed) or lobes pinnately nerved or 1-nerved, linear, 20–100 × 0.5–1.5 mm, bases narrowly cuneate to attenuate, margins entire or serrate, apices acute, faces puberulent, gland-dotted.

5;

corollas 2–2.5 mm.

7–9;

corollas 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).

10–12 in 2–3 series, elliptic to oblong, 1–3.5 × 0.5–1 mm, apices acute to acuminate, shortly mucronate, abaxial faces puberulent, gland-dotted.

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

in subcorymbiform to subpaniculiform arrays.

1–1.5 mm;

pappi of 15–30 bristles 2–2.5 mm.

1–1.5 mm;

pappi of 20–30 bristles 2.5–3 mm.

= 20.

= 20.