Flora of North America species comparison

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

(from short caudices) multiple, branched distally, puberulent throughout.

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 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.

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.

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 corymbiform arrays.

in dense, paniculiform arrays.

1–1.5 mm;

pappi of 20–30 bristles 2–2.5 mm.

1–1.7 mm;

pappi of 20–30 bristles 2–2.5 mm.

= 20.

= 20.