Flora of North America species comparison

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

intricately branched, densely puberulent, often 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 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.

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

0–3 mm, gland-dotted.

cylindric to campanulate, 8–12 mm.

cylindric, 8–10 mm.

13–25;

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

8–12;

corollas white, 4.5–5 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).

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).

in loose, paniculiform arrays.

in paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

2–3 mm, scabrous;

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