Flora of North America species comparison

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

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

usually present at flowering;

sessile;

blades (1-nerved) linear-oblanceolate to narrowly oblong, 20–40(–80) × 4–8 mm, bases cuneate, margins evenly serrate (teeth spinulose, apices acute, faces finely gland-dotted, not 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.

campanulate; staminate 3–6 mm, pistillate 3–6 mm.

campanulate to obconic; staminate 4–5 mm, pistillate 5–6 mm.

30;

corollas 2.2–3 mm.

15–25;

corollas 3–4 mm.

20–30;

corollas 3 mm.

20–30;

corollas 4–5 mm.

lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).

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

(10–50+) in terminal, compact, rounded paniculiform arrays.

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

1.5–2.2 mm, 5-nerved, glabrous;

pappi 4–6 mm.

1.5–2 mm, 8–10-nerved, glabrous;

pappi 8–9 mm.