Flora of North America species comparison

intricately branched, hirtellous, sparsely gland-dotted.

intricately branched, densely puberulent, often gland-dotted.

alternate;

petioles 1–2 mm;

blades (venation obscure) oblong to spatulate, 3–12 × 1–4 mm, bases acute to acuminate, margins entire, apices acute to obtuse, faces tomentose, gland-dotted.

opposite or alternate;

petioles 1–2.5 mm;

blades 3-nerved from bases, ovate, 3–13 × 4–14 mm, bases obtuse to truncate, margins crenate-serrate, apices obtuse, faces gland-dotted and tomentulose to densely puberulent.

10–30 mm, villous, gland-dotted.

0–3 mm, gland-dotted.

cylindric, 9–11 mm.

cylindric, 8–10 mm.

20–30;

corollas purplish, 6.5–7.5 mm.

8–12;

corollas white, 4.5–5 mm.

20–25 in 5–6 series, greenish, often purple-tinged, 4–5-striate, unequal, (sparsely villous, gland-dotted) margins narrowly scarious (apices rounded, mucronate);

outer ovate to lanceolate (ciliate), inner linear-oblong.

20–24 in 4–7 series, greenish or brownish, 3–4-striate, unequal, margins scarious (apices acute to apiculate);

outer broadly ovate (granular-puberulent), inner lanceolate to lance-linear (glabrous or tomentulose, often gland-dotted).

in paniculiform arrays.

in paniculiform arrays.

3.5–4.8 mm, hispidulous;

pappi of 26–30 white, barbellulate bristles.

2–3 mm, scabrous;

pappi of 12–15 white, smooth or barbellulate bristles.