Flora of North America species comparison

spreading to ascending, green to tan, simple proximally, sparingly branched distally, striate-angled, glabrous or minutely hairy, resinous and ± resin-varnished.

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

present at flowering (abundant, well developed);

sessile or petiolate;

blades lanceolate-elliptic, slightly falcate (willowlike), 30–150 × 3–20 mm, bases attenuate, margins usually finely serrate from bases to apices, sometimes entire, apices acute to acuminate, 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.

hemispheric;

staminate 3–6 mm, pistillate involucres 3–6 mm.

campanulate to obconic;

staminate 4–5 mm, pistillate 5–6 mm.

50–150;

corollas 2–3.5 mm.

15–25;

corollas 3–4 mm.

(10–)17–48;

corollas 4–6 mm.

20–30;

corollas 4–5 mm.

ovate to lanceolate, 2–4 mm, margins scarious, erose or irregularly dentate, midribs distinct, medians green or reddish, apices (greenish or brownish purple) obtuse to acuminate (pale and dry, glabrous).

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

in terminal, compound corymbiform arrays (often involving distal branches).

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

0.8–1.5 mm, 5-nerved, glabrous;

pappi 3–6 mm.

1.5–2 mm, 8–10-nerved, glabrous;

pappi 8–9 mm.

= 18, 36.