Flora of North America species comparison

erect (green to tan), slender, striate-angled, glabrous, resinous.

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

present at flowering; short-petiolate;

blades (1-nerved) narrowly spatulate to linear, 20–40 × 2–3 mm, reduced to bracts distally, bases attenuate, margins entire or toothed (teeth to 2 mm), faces glabrous, gland-dotted, 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.

cylindro-campanulate;

staminate 3 mm, pistillate 4–4.5 mm.

campanulate to obconic;

staminate 4–5 mm, pistillate 5–6 mm.

15–20;

corollas 3 mm.

15–25;

corollas 3–4 mm.

12–15;

corollas 3–4 mm.

20–30;

corollas 4–5 mm.

lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).

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

in broad paniculiform arrays.

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

2–2.5 mm, 5-nerved, glabrous;

pappi 4 mm.

1.5–2 mm, 8–10-nerved, glabrous;

pappi 8–9 mm.