Flora of North America species comparison

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

branched, coarsely scabrous.

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.

alternate to subopposite;

petioles 1–5 mm;

blades 3-nerved from bases, lanceolate to lance-ovate, 20–40 × 7–20 mm, bases rounded to broadly cuneate, margins entire or serrate, apices acute to acuminate, faces sparsely pubescent, stipitate-glandular.

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

5–45 mm, pubescent, stipitate-glandular.

cylindric to campanulate, 8–12 mm.

cylindric to campanulate, 7–11 mm.

13–25;

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

11–22;

corollas pale yellow or cream, 4.7–6 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).

16–20 in 4–5 series, greenish, often purple-tinged, 4–8-striate, unequal, margins narrowly scarious, often ciliate (apices acute to long-attenuate);

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

in loose, paniculiform arrays.

in open, racemose or paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

4–5 mm, silvery-setulose.

of 25–34 white, plumose bristles.