Flora of North America species comparison

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

branched from bases, pubescent and gland-dotted.

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.

opposite;

petioles 0–1 mm;

blades 3-nerved from bases (pinnately-veined distally), lanceolate to oblong, 40–160 × 10–75 mm, bases rounded to cordate (clasping), margins crenate to serrate, apices acute, faces densely to sparsely pubescent and stipitate-glandular.

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

7–25 mm, densely stipitate-glandular.

cylindric to campanulate, 8–12 mm.

cylindric to campanulate, 9–13 mm.

13–25;

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

13–22;

corollas pale yellow or cream, often purple- or red-tinged, 6–8 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).

18–24 in 4–5 series, greenish, often purple-tinged, 3–8-striate, unequal, margins narrowly scarious (apices acute to acuminate);

outer ovate (6–8-striate, sparsely glandular at apices), inner narrowly lanceolate (3–4-striate, glabrous).

in loose, paniculiform arrays.

in paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

2.8–4 mm, densely pubescent to hirtellous;

pappi of 35–60 white, barbellulate bristles.