Flora of North America species comparison

much branched from bases, pubescent, often gland-dotted.

branched, stipitate-glandular to glandular-pubescent.

opposite;

petioles 4–12 mm;

blades 3-nerved from bases, broadly ovate to deltate, 10–60 × 10–30 mm, bases truncate, hastate, or subcordate, margins usually toothed (1–3 sets of sharp teeth near bases), rarely subentire, apices attenuate, faces minutely 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.

5–40 mm, pubescent and sometimes gland-dotted.

2–50 mm, glandular-pubescent.

cylindric to campanulate, 8–12 mm.

cylindric to campanulate, 10–20 mm.

13–25;

corollas pale yellow-green, often purple-tinged, 7–8.2 mm.

25–50;

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

17–22 in 4–6 series, greenish, often purple-tinged, 4–5-striate, unequal, margins scarious (apices acute to acuminate or mucronate, minutely pubescent);

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

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).

in loose, paniculiform arrays.

borne singly or in corymbiform arrays.

3–5 mm, hispidulous, strigose, or glandular-pubescent;

pappi of 28–40 smooth or barbellulate bristles.

3–7 mm, stipitate-glandular or hispidulous;

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