Flora of North America species comparison

(from short caudices or stout rhizomes) single, sparsely branched distally, pubescent throughout.

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

usually opposite (distal sometimes alternate);

sessile;

blades ± 3-nerved or pinnately nerved, elliptic to oblanceolate, 30–120 × 10–40 mm (lengths mostly 3–4 times widths), bases narrowly cuneate (sometimes oblique), margins subentire, serrate, or serrulate, apices rounded to acute, faces setulose (denser on midribs and veinlets) to glabrate, usually gland-dotted.

usually opposite (distal sometimes alternate, spreading or horizontal);

sessile;

blades pinnately nerved, elliptic or lance-ovate to narrowly ovate, 50–100 × 15–40 mm, bases rounded to cuneate (not connate-perfoliate), margins serrate, apices acute, faces puberulent or villous, gland-dotted.

(4–)5;

corollas 4–4.5 mm.

(4–)5;

corollas 3–3.5 mm.

9–15 in 2–4 series, linear, 1.5–9 × 0.6–1 mm, apices acuminate to attenuate, sometimes mucronate, abaxial faces pubescent throughout, gland-dotted.

7–10 in 2–3 series, lanceolate (tapering at tips), 2–6 × 1–1.5 mm, apices acute, not mucronate, abaxial faces puberulent, gland-dotted.

in corymbiform arrays.

in corymbiform arrays.

2.5–3.5 mm;

pappi of 40–50 bristles 3.5–4.5 mm.

2–3 mm;

pappi of 20–50 bristles 3.5–4.5 mm.

= 30, 40.