Flora of North America species comparison

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

branched from bases, densely white-tomentose.

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.

alternate;

petioles 0–2 mm;

blades 3-nerved from bases, ovate, 10–30 × 5–20 mm, bases obtuse to truncate, margins entire or serrulate, apices acute, faces densely white-tomentose, often gland-dotted.

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

30–60 mm, canescent.

cylindric to campanulate, 8–12 mm.

campanulate, 15–20 mm.

13–25;

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

45–60;

corollas pale yellow or cream, often purple-tinged, 8.5–14 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).

38–44 in 6–8 series, greenish to purple, 6–9-striate, unequal, margins narrowly scarious-ciliate (faces white tomentose and gland-dotted, apices obtuse to acuminate);

outer ovate, inner lanceolate.

in loose, paniculiform arrays.

borne singly.

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

pappi of 28–40 smooth or barbellulate bristles.

8.5–10 mm, sericeous, gland-dotted;

pappi of 42–44 white, barbellate bristles.

= 18.