Flora of North America species comparison

branched, pubescent.

intricately branched, densely puberulent, often 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.

opposite or alternate;

petioles 1–2.5 mm;

blades 3-nerved from bases, ovate, 3–13 × 4–14 mm, bases obtuse to truncate, margins crenate-serrate, apices obtuse, faces gland-dotted and tomentulose to densely puberulent.

4–20 mm, pubescent.

0–3 mm, gland-dotted.

cylindric to campanulate, 8–11 mm.

cylindric, 8–10 mm.

9–12;

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

8–12;

corollas white, 4.5–5 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).

20–24 in 4–7 series, greenish or brownish, 3–4-striate, unequal, margins scarious (apices acute to apiculate);

outer broadly ovate (granular-puberulent), inner lanceolate to lance-linear (glabrous or tomentulose, often gland-dotted).

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

in paniculiform arrays.

2.5–5.3 mm, mostly velutinous, sometimes pubescent;

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

2–3 mm, scabrous;

pappi of 12–15 white, smooth or barbellulate bristles.

= 18.