Flora of North America species comparison

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

(from short caudices) multiple, 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 because of development of leaves on lateral buds without axis elongation);

sessile;

blades (often ternately lobed) or lobes linear, 5–100 × 0.2–0.5(–1) mm, bases ± cuneate, margins entire (strongly revolute), apices rounded to acute, faces glabrate, gland-dotted.

5;

corollas 2–2.5 mm.

5;

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).

8–10 in 2–3 series, oblong, 0.5–2.5 × 0.2–0.5 mm, apices acuminate and mucronate, abaxial faces glabrous or glabrate, not or little, if at all, gland-dotted.

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

in dense, paniculiform arrays.

1–1.5 mm;

pappi of 15–30 bristles 2–2.5 mm.

1–1.7 mm;

pappi of 20–30 bristles 2–2.5 mm.

= 20.

= 20.