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 0–1 mm;

blades 3-nerved from bases, oblong to linear, 20–60 × 2–10 mm, bases cuneate, margins entire or dentate, apices obtuse, faces pubescent, gland-dotted.

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

(20–)30–150 mm, puberulent, gland-dotted.

cylindric to campanulate, 8–12 mm.

cylindric to campanulate, 9–10 mm.

13–25;

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

18–25;

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

25–35 in 6–9 series, greenish, often purple-tinged, 3–9-striate, unequal, margins scarious (ciliate);

outer broadly ovate to orbiculate (glandular-pubescent, apices acute to cuspidate), inner lanceolate to linear-lanceolate (glabrous, apices acute to mucronate).

in loose, paniculiform arrays.

in open, paniculiform arrays or borne singly (often terminal on lateral branches).

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

pappi of 28–40 smooth or barbellulate bristles.

3–3.5 mm, pubescent to velutinous;

pappi of 30–40 white, barbellate bristles.

= 18, 18 + 1.