Flora of North America species comparison

erect to spreading, green when young, fastigiately branched, glabrous or sparsely hairy, resinous.

spreading to ascending or erect, green when young, highly branched, glabrous, gland-dotted (sometimes in pits), resinous.

mostly ascending to spreading, often recurved distally;

blades filiform to narrowly oblanceolate (adaxially sulcate), 10–25 × 0.5–1.5 mm, midnerves obscure, apices apiculate, faces glabrous, resinous (axillary fascicles usually present).

ascending-spreading;

blades cuneate to spatulate, 2–25 × 2–16 mm, midnerves evident or faint, (margins usually flat) apices rounded, obtuse, or retuse, sometimes mucronate, faces glabrous, gland-dotted (in pits), thickly resinous;

axillary leaf fascicles rarely present.

1–10 mm (bracts 0–15+).

2–10 mm (bracts 0–10+, scalelike).

obconic, 5.5–8 × 3–5 mm.

turbinate to narrowly campanulate, 6–12.5 × 4–14 mm.

3–7;

laminae (white) 5.5–7 × 1.5–2 mm.

0(–7);

laminae 3–4.3 × 1–1.5 mm.

10–15;

corollas (white) 6–8 mm.

7–70;

corollas ca. 5.5 mm.

22–34 in 4–5 series, green to tan, lanceolate to oblong, 1–6 × 0.5–1.5 mm, strongly unequal (sometimes outer subequal), mostly chartaceous, outer herbaceous or apically so (mid bodies often apically obtuse to notched, with subulate appendages), midnerves evident, (margins narrowly membranous, entire or serrulate, often ciliolate) apices acute to attenuate (outer often squarrose), abaxial faces glabrous, resinous.

20–60 in 3–7 series, tan, ovate to lanceolate, 2–6 × 0.5–2.5 mm, unequal, mostly chartaceous, sometimes each with herbaceous subapical patch, midnerves evident on proximal 1/2 or throughout, subapical resin ducts 0 or slightly darker, thickened and expanded, (margins membranous, weakly lacerate) apices acute to acuminate or obtuse, abaxial faces glabrous.

in loose, cymiform arrays (1–4 cm wide).

usually borne singly, sometimes in rounded, cymiform arrays (to 5 × 8 cm).

tan to brown, narrowly turbinate, 4.5–5 mm, moderately to densely sericeous;

pappi off-white to brown, 5.8–7.2 mm.

tan to brown, turbinate, 2.5–3 mm, sericeous to villous;

pappi off-white to brown, 6.5–8 mm.

= 18.

= 18.