Flora of North America species comparison

(from short caudices) single or multiple, branched at or near bases, pubescent throughout.

(from short caudices or rhizomes) single, sparsely branched distally, 5–10+ dm, glabrous or glabrate proximally, puberulent distally (among heads).

usually opposite (distal sometimes alternate);

sessile or subsessile;

blades 3-nerved distal to bases, oblong to lance-oblong, 20–45 × 5–10 mm, bases cuneate, margins entire or serrate (teeth mostly proximal), apices acute, faces finely puberulent, gland-dotted.

usually opposite (distal sometimes alternate); simple, sessile;

blades pinnately nerved, lanceolate to oblong, 70–150+ × 10–30 mm (lengths mostly 2–5 times widths), bases truncate to somewhat rounded, margins serrate, apices narrowly acute to acuminate, faces glabrate (scattered, fine hairs), gland-dotted.

5;

corollas 3–3.5 mm.

5;

corollas 3–3.5 mm.

8–10 in 1–2 series, lanceolate (tapering toward apices), 2–5 × 0.5–1 mm, apices rounded to acute, abaxial faces puberulent, gland-dotted.

10–15 in 2–3 series, elliptic to oblong, 2–5 × 0.5–1.5 mm, apices rounded to acute (not mucronate), abaxial faces villous to puberulent, gland-dotted.

in corymbiform arrays.

in corymbiform arrays.

2.5–3 mm;

pappi of 30–40 bristles 3–5 mm.

2–3 mm;

pappi of 30–40 bristles 3–4 mm.

= 20, 30, 40.

= 20, 30.