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.

erect to spreading, abundantly branched, twigs green when young, concealed by whitish, pannose tomentum, sporadically stipitate-glandular.

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 to spreading;

blades linear or oblong to oblanceolate (flat), 10–35 × 2–7 mm, midnerves evident (1–2 fainter, collateral nerves often present), (margins often undulate) apices acute to obtuse, usually apiculate, faces usually stipitate-glandular, resinous;

axillary fascicles absent.

0.2–5 mm (mostly ebracteate, glabrous).

3–15 mm (bracts 0–3, reduced, leaflike, whitish tomentose and usually stipitate-glandular).

obconic, 5.5–7.5 × 2.5–4 mm.

obconic, 9–13 × 6–10 mm.

1–7;

laminae elliptic, 3–4 × 0.8–1.3 mm.

0.

4–8;

corollas 4.5–6.5 mm.

10–26;

corollas 9–11 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.

12–17 in 2–3 series, green to tan, lanceolate to oblong, 6–10 × 1–2 mm, subequal, outer herbaceous or distally so, inner mostly chartaceous, midnerves evident, (margins of outer often distally stipitate-glandular, of inner narrowly membranous, sometimes minutely ciliolate) apices acute to attenuate, abaxial faces stipitate-glandular.

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

borne singly or in cymiform to racemiform arrays.

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

pappi tan, 4–5.5 mm.

brownish, narrowly oblong to narrowly ovoid, 5–6 mm, villous;

pappi tan, 8.5–11 mm.

= 18.

= 18.