Flora of North America species comparison

branched, pubescent.

branched, pubescent.

mostly alternate (sometimes subopposite);

petioles 0–3 mm;

blades 3-nerved from bases, lanceolate or lance-ovate, 10–50 × 4–20 mm, bases acute to obtuse, margins serrate or entire, apices acute, faces sparsely to densely pubescent, often gland-dotted or stipitate-glandular.

opposite;

petioles 0–1 mm;

blades 3-nerved from bases, deltate-ovate to lanceolate, 7–30 × 4–28 mm, bases mostly obtuse to subtruncate, sometimes acuminate, margins serrate, apices acute, faces puberulent, gland-dotted.

4–20 mm, pubescent.

10–30 mm, puberulent.

cylindric to campanulate, 8–11 mm.

cylindric to campanulate, 8–12 mm.

9–12;

corollas pale yellow-green, often purple-tinged, 4.5–6 mm.

8–14;

corollas pale green or yellow, 5.5–6.5 mm.

15–20 in 4–5 series, greenish, often purple-tinged, 5–9-striate, unequal, margins narrowly scarious (often ciliate, apices acute to acuminate or subaristate);

outer lance-ovate (often puberulent), inner narrowly lanceolate (glabrous).

12–15 in 3–5 series, greenish, often purple-tinged, 5–7-striate, unequal, margins scarious (apices acute);

outer ovate to lance-ovate (puberulent, margins ciliate), inner narrowly lanceolate (glabrous).

usually in open, racemiform or paniculiform arrays, rarely borne singly.

borne singly or in corymbiform-paniculiform arrays.

2.5–5.3 mm, mostly velutinous, sometimes pubescent;

pappi of 27–32 white, usually plumose, rarely barbellate, bristles.

4.5–5 mm, densely pubescent;

pappi of 24–30 white, usually barbellate, sometimes subplumose, bristles.

= 18.

= 18.