Flora of North America species comparison

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

branched, 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.

opposite;

petioles 0–1 mm;

blades 3-nerved from bases, deltate-ovate to lanceolate, 7–30 × 4–28 mm, bases mostly obtuse to subtruncate, sometimes acuminate, margins serrate, apices acute, faces puberulent, gland-dotted.

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

10–30 mm, puberulent.

cylindric to campanulate, 8–12 mm.

cylindric to campanulate, 8–12 mm.

13–25;

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

8–14;

corollas pale green or yellow, 5.5–6.5 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).

12–15 in 3–5 series, greenish, often purple-tinged, 5–7-striate, unequal, margins scarious (apices acute);

outer ovate to lance-ovate (puberulent, margins ciliate), inner narrowly lanceolate (glabrous).

in loose, paniculiform arrays.

borne singly or in corymbiform-paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

4.5–5 mm, densely pubescent;

pappi of 24–30 white, usually barbellate, sometimes subplumose, bristles.

= 18.