Flora of North America species comparison

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

branched, pubescent, 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 2–4 mm;

blades 3-nerved from bases (abaxial venation raised, reticulate), lanceolate to oblong, 35–60 × 10–20 mm, bases acute or rounded, margins serrate, apices acute, faces sparsely to densely pubescent, gland-dotted.

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

(bracteate) 1–8 mm, densely tomentose.

cylindric to campanulate, 8–12 mm.

cylindric to turbinate, 13–15 mm.

13–25;

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

19–24;

corollas pale yellow, 8–9.5 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).

34–40 in 6–8 series, greenish to stramineous, 5–8-striate, unequal, margins scarious (ciliate, apices acute);

outer ovate to lance-ovate (often villous toward tips), inner lanceolate (glabrous).

in loose, paniculiform arrays.

borne singly (in axils) or in paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

3.5–4 mm, hirsute;

pappi of 26–42 white, barbellate bristles.

= 18.