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.

mostly opposite, sometimes alternate or subopposite;

petioles 0–3 mm;

blades 3-nerved from bases, lanceolate to obovate, 20–60 × 12–30 mm, bases ± cuneate, margins crenate to serrate, apices obtuse to acute, abaxial faces tomentose, often densely gland-dotted as well (venation raised, reticulate), adaxial faces pubescent and gland-dotted.

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

2–15 mm, densely tomentose, often gland-dotted.

cylindric to campanulate, 8–12 mm.

cylindric to campanulate, 8–13 mm.

13–25;

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

10–21;

corollas greenish, yellow, or yellow-orange, often purple-tinged, 5–7 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).

18–22 in 5–7 series, greenish, often purplish-tinged, 6–8-striate, unequal, margins scarious (apices acute to acuminate);

outer ovate (sparsely villous, gland-dotted, lengths no more than 1/2 inner, margins long-ciliate), inner narrowly lanceolate to linear-oblong (glabrous).

in loose, paniculiform arrays.

in ± dense, racemiform or paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

3.5–5 mm, sparsely to densely pubescent;

pappi of 30–35, white to tawny, barbellate bristles.

= 18.