Flora of North America species comparison

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

densely branched, glandular-puberulent.

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 0–3 mm;

blades 3–4-nerved from bases (veins prominent), deltate, lanceolate, or ovate, 10–50 × 5–25 mm, bases acute to truncate or cordate, margins usually sharply dentate or dentate-serrate, rarely entire, apices acute to acuminate, faces glabrous or strigose and minutely glandular-puberulent.

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

10–70 mm, hispid to hispidulous and stipitate-glandular.

cylindric to campanulate, 8–12 mm.

cylindric to broadly campanulate, 9–15 mm.

13–25;

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

40–90;

corollas pale yellow-green or cream, often purple-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).

24–33 in 3–4 series, green, 3–16-striate, subequal or unequal, margins narrowly scarious (apices acute to acuminate);

outer (often bright green, 4–16-striate) lance-linear, linear-ovate, or broadly ovate, inner (pale green, 3–4-striate) linear or narrowly lanceolate (often chartaceous, scabrellous, often glandular).

in loose, paniculiform arrays.

in open, paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

3–5.5 mm, scabrellous;

pappi of 18–25 smooth or barbellulate bristles.