Flora of North America species comparison

branched from bases, pubescent.

much branched, pubescent, gland-dotted.

opposite;

petioles 1–5 mm;

blades 3-nerved from bases, oblong, obovate, or ovate, (15–)30–80 × 10–35 mm, bases cordate or truncate, margins crenate-serrate, apices acute to obtuse, faces sparsely pubescent and gland-dotted.

alternate;

petioles 0–3 mm;

blades 3-nerved from bases, ovate to suborbiculate, 3–20 × 1–15 mm, bases acute to obtuse or rounded, margins entire, coarsely dentate or serrate, apices rounded to acute, faces glandular-villous or hispidulous.

2–15 mm, hispid to hirsute.

(bracteate) 2–10 mm, viscid to glandular-villous.

cylindric to narrowly campanulate, 8–12 mm.

cylindric to narrowly campanulate, 7–12 mm.

10–16;

corollas purplish, 7–9 mm.

8–28(–34);

corollas pale yellow, often purple-tinged, 5.5–7 mm.

17–20 in 3–5 series, pale green, often purplish, 5–9-striate, unequal, margins narrowly scarious-ciliate (apices acute to acuminate);

outer lance-ovate (sparsely pubescent), inner narrowly lanceolate (glabrous).

30–48 in 5–8 series, greenish, often purple-tinged, 3–5-striate, (recurved or spreading) unequal, margins scarious (apices acute to acuminate);

outer obovate to suborbiculate (glandular-pubescent; mid sometimes 3-toothed with middle tooth elongated), inner linear-oblong (glabrous or sparsely gland-dotted).

erect, usually in loose, paniculiform arrays, sometimes borne singly.

in loose, paniculiform arrays (often clustered at ends of branches).

3–4 mm, densely pubescent to velutinous;

pappi of 40–52 white, barbellate bristles.

3.5–4.7 mm, glabrous or hirtellous;

pappi of 18–24 white, barbellulate bristles.

= 18.