Flora of North America species comparison

erect to ascending, striate-angled, glabrous or minutely scurfy, not resinous.

erect to ascending, slender, striate-angled, glabrous, resinous.

present at flowering (not in fascicles);

petioles to 7 mm;

blades obovate or elliptic to rhombic, 20–60 × 8–40 mm, leathery, bases cuneate to attenuate, margins serrate (teeth 1–3 per side distal to middles, relatively broad), apices acute, faces glabrous, abaxial black gland-dotted (distal reduced, entire), adaxial eglandular.

present at flowering; short-petiolate;

blades (1- or obscurely 3-nerved) obovate to oblanceolate, 20–35 × 3–15 mm, distally reduced and narrowed, bases cuneate, margins irregularly incised to coarsely serrate or 2-serrate, faces glabrous, gland-dotted, resinous.

campanulate to obconic;

staminate 4–5 mm, pistillate 5–6 mm.

campanulate;

staminate 4–5 mm, pistillate 4–5 mm.

15–25;

corollas 3–4 mm.

25–30;

corollas 2–2.6 mm.

20–30;

corollas 4–5 mm.

15–20;

corollas 3.5–4 mm.

ovate to lanceolate, 1–4 mm, margins scarious, medians green, apices rounded or obtuse (sometimes purplish).

lanceolate, 1–4 mm, margins scarious, medians green, apices acute, erose.

(1–4, sessile or subsessile) in axillary glomerules scattered along branches.

(20–50) in corymbiform arrays.

1.5–2 mm, 8–10-nerved, glabrous;

pappi 8–9 mm.

1.5–2.2 mm, 5-nerved, glabrous;

pappi 3–4.5 mm.