Flora of North America species comparison

erect to spreading or recurved, green when young, soon becoming tan to brown, then nearly black when older, highly branched, twigs glabrous, glandular, usually resinous.

ascending to spreading, green when young, becoming dark brown then gray, branched, twigs stipitate-glandular, resin coated.

ascending to spreading;

blades usually elliptic to oblanceolate, occasionally spatulate, 10–15 × 0.5–1.5 mm, mostly adaxially sulcate, margins entire, midnerves usually obscure to weakly evident, apices acute, apiculate, faces glandular, sometimes irregularly gland-dotted (in shallow pits), resinous;

axillary fascicles present, persistent.

ascending;

blades elliptic to obovate, 9–18 × 2.5–4 mm, midnerves prominent with 2 fainter, collateral nerves, (margins undulate) apices usually obtuse to rounded, sometimes acute, apiculate, faces stipitate-glandular, resinous;

axillary leaf fascicles reduced or absent.

0.2–5 mm (mostly ebracteate, glabrous).

1–15 mm (bracts 3–8, gradually reduced, leafy).

obconic, 5.5–7.5 × 2.5–4 mm.

obconic, 5–7 × 2.5–3.5 mm.

1–7;

laminae elliptic, 3–4 × 0.8–1.3 mm.

3–4;

laminae elliptic, 1.9–2.5 × 0.6–1.3 mm.

4–8;

corollas 4.5–6.5 mm.

8–9;

corollas 3.5–5.3 mm.

22–30 in 4–5 series, mostly tan, lanceolate to elliptic, 2–6.5 × 0.5–1.2 mm, strongly unequal, outer sometimes herbaceous or herbaceous-tipped (body apices obtuse or truncate to retuse, appendages erect), midnerves not evident or slightly raised, slightly expanded subapically, (mostly margins narrowly membranous, entire) apices acute to acuminate or attenuate, mid often aristate to cuspidate, abaxial faces glabrous, resinous.

22–30 in 4–5 series, mostly tan, lanceolate to elliptic, 1.5–5 × 0.8–1.2 mm, strongly unequal, chartaceous (bodies abruptly constricted at bases of appendages), midnerves usually inconspicuous, (margins scarious, entire or minutely lacerate) apices acute to acuminate or cuspidate, abaxial faces glabrous, lightly resinous, sometimes gland-dotted.

in congested, cymiform arrays (0.5–2.5 cm wide).

in cymiform arrays.

tan, narrowly oblanceoloid, 4–5.5 mm, glabrous or densely sericeous;

pappi tan, 4–5.5 mm.

tan, subcylindric to narrowly oblanceoloid, 2.2–4 mm, sericeous;

pappi whitish, 3–5 mm.

= 18.

= 18.