Flora of North America species comparison

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

branched from above bases, ± glabrous.

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 0–5 mm;

blades 3-nerved from bases, lance-elliptic, lance-ovate, lance-linear, or linear (folded or falcate), 10–130 × 2–9 mm, bases rounded or tapering, margins entire or nearly so, apices acuminate, faces gland-dotted, often puberulent (shiny).

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

0–3 mm, glabrous or glutinous.

cylindric to campanulate, 8–12 mm.

cylindric, 5–7 mm.

13–25;

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

3–7;

corollas cream, 3.5–4.5 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).

10–24 in 6–8 series, pale green to stramineous, 3–5-striate, unequal, (glutinous) margins scarious;

outer ovate (apices acute), inner lanceolate (apices obtuse).

in loose, paniculiform arrays.

in (leafy) paniculiform arrays.

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

pappi of 28–40 smooth or barbellulate bristles.

1.8–2.5 mm, scabrous;

pappi of 30–40 barbellulate bristles.