Flora of North America species comparison

with slender branches from bases, hairy, developing fissured barks.

with slender branches from bases, glabrous, developing smooth or roughened barks.

cauline;

petioles 2–7 mm;

blades gray-green, narrowly ovate to deltate, 12–25 mm, apices acute or obtuse, faces sparsely canescent and strigose.

cauline;

petioles 5–25 mm;

blades green, rhombic or narrowly ovate, 30–60 mm, apices acute, faces glabrous.

canescent.

pubescent.

9–13 mm.

10–12 mm.

11–21;

corolla laminae 8–15 mm.

15–25;

corolla laminae 15–35 mm.

yellow, 5–6 mm.

brown-purple, 5–6 mm.

narrowly ovate.

lanceolate.

borne singly.

borne singly.

5–8 mm;

pappi usually 0, rarely of 1–2 bristlelike awns.

5–7 mm;

pappi 0.

= 36.

= 36.