Flora of North America species comparison

erect to ascending, striate, glabrous, gland-dotted, resinous.

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

present at flowering; short-petiolate;

blades (1- or 3-nerved, larger prominently 3-nerved) lanceolate, 50–130 × 8–30 mm, bases tapered to petioles, margins entire or finely dentate, apices acute to acuminate, faces glabrous, black gland-dotted.

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.

hemispheric; staminate 3.5–5 mm, pistillate 3.8–4.8(–6) mm.

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

80–150;

corollas 1.7–3 mm.

15–25;

corollas 3–4 mm.

26–40;

corollas 3.5–4 mm.

20–30;

corollas 4–5 mm.

narrowly lanceolate, 2–4 mm, inner series ± equal, margins yellowish, medians green to purplish, apices acuminate, erose or ciliate, faces glabrous, gland-dotted, resinous.

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

in dense, terminal, flat-topped, corymbiform arrays.

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

0.6–1.5 mm, 5-nerved, glandular, hispidulous distally;

pappi 2.6–4(–7) mm.

1.5–2 mm, 8–10-nerved, glabrous;

pappi 8–9 mm.

= 18.