Flora of North America species comparison

branched, stipitate-glandular to glandular-pubescent.

branched from bases, pubescent.

mostly alternate (sometimes subopposite);

petioles 0;

blades obscurely 3-nerved from bases, elliptic, lance-linear, or oblong, 9–40 × 1–15 mm, bases acute to attenuate, margins entire, apices acute or obtuse, faces pubescent to villous, often stipitate-glandular.

opposite;

petioles 1–5 mm;

blades 3-nerved from bases, oblong, obovate, or ovate, (15–)30–80 × 10–35 mm, bases cordate or truncate, margins crenate-serrate, apices acute to obtuse, faces sparsely pubescent and gland-dotted.

2–50 mm, glandular-pubescent.

2–15 mm, hispid to hirsute.

cylindric to campanulate, 10–20 mm.

cylindric to narrowly campanulate, 8–12 mm.

25–50;

corollas pale yellow-green or cream, often purple-tinged, 5–10 mm.

10–16;

corollas purplish, 7–9 mm.

25–35 in 4–6 series, greenish, 4–5-striate, unequal, margins scarious (sometimes ciliate, apices acute to acuminate);

outer ovate to lanceolate (gland-dotted to glandular-puberulent), inner linear-lanceolate to linear (glabrous).

17–20 in 3–5 series, pale green, often purplish, 5–9-striate, unequal, margins narrowly scarious-ciliate (apices acute to acuminate);

outer lance-ovate (sparsely pubescent), inner narrowly lanceolate (glabrous).

borne singly or in corymbiform arrays.

erect, usually in loose, paniculiform arrays, sometimes borne singly.

3–7 mm, stipitate-glandular or hispidulous;

pappi of 18–25 white, barbellate to subplumose bristles.

3–4 mm, densely pubescent to velutinous;

pappi of 40–52 white, barbellate bristles.

= 18.