Flora of North America species comparison

branched, pubescent.

branched, pubescent, gland-dotted.

mostly alternate (sometimes subopposite);

petioles 0–3 mm;

blades 3-nerved from bases, lanceolate or lance-ovate, 10–50 × 4–20 mm, bases acute to obtuse, margins serrate or entire, apices acute, faces sparsely to densely pubescent, often gland-dotted or stipitate-glandular.

mostly opposite, sometimes alternate or subopposite;

petioles 0–3 mm;

blades 3-nerved from bases, lanceolate to obovate, 20–60 × 12–30 mm, bases ± cuneate, margins crenate to serrate, apices obtuse to acute, abaxial faces tomentose, often densely gland-dotted as well (venation raised, reticulate), adaxial faces pubescent and gland-dotted.

4–20 mm, pubescent.

2–15 mm, densely tomentose, often gland-dotted.

cylindric to campanulate, 8–11 mm.

cylindric to campanulate, 8–13 mm.

9–12;

corollas pale yellow-green, often purple-tinged, 4.5–6 mm.

10–21;

corollas greenish, yellow, or yellow-orange, often purple-tinged, 5–7 mm.

15–20 in 4–5 series, greenish, often purple-tinged, 5–9-striate, unequal, margins narrowly scarious (often ciliate, apices acute to acuminate or subaristate);

outer lance-ovate (often puberulent), inner narrowly lanceolate (glabrous).

18–22 in 5–7 series, greenish, often purplish-tinged, 6–8-striate, unequal, margins scarious (apices acute to acuminate);

outer ovate (sparsely villous, gland-dotted, lengths no more than 1/2 inner, margins long-ciliate), inner narrowly lanceolate to linear-oblong (glabrous).

usually in open, racemiform or paniculiform arrays, rarely borne singly.

in ± dense, racemiform or paniculiform arrays.

2.5–5.3 mm, mostly velutinous, sometimes pubescent;

pappi of 27–32 white, usually plumose, rarely barbellate, bristles.

3.5–5 mm, sparsely to densely pubescent;

pappi of 30–35, white to tawny, barbellate bristles.

= 18.

= 18.