Flora of North America species comparison

branched, puberulent, gland-dotted.

branched, pubescent, gland-dotted.

alternate;

petioles 10–50 mm;

blades 3-nerved from bases, deltate or rhombic-ovate, 50–100 × 20–50 mm, bases acute to truncate, margins crenate or coarsely dentate, apices long-acuminate, abaxial faces sparsely villous, gland-dotted, adaxial faces glabrous or sparsely pubescent, often gland-dotted.

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.

4–6 mm, puberulent, sparsely gland-dotted.

(bracteate) 1–8 mm, densely tomentose.

cylindric to campanulate, 7–10 mm.

cylindric to turbinate, 13–15 mm.

13–20;

corollas yellowish, 5.3–6.5 mm.

19–24;

corollas pale yellow, 8–9.5 mm.

22–26 in 4–7 series, 3–5-striate, unequal, margins scarious (apices obtuse to acute);

outer ovate to lanceolate (often purple-tinged, glabrous or puberulent), inner linear to oblong (greenish, 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 paniculiform arrays.

borne singly (in axils) or in paniculiform arrays.

2–2.5 mm, sericeous;

pappi of 26–32 white, barbellate bristles.

3.5–4 mm, hirsute;

pappi of 26–42 white, barbellate bristles.

= 18.

= 18.