Flora of North America species comparison

erect, much branched, twigs crowded, green when young, becoming reddish brown to gray, glabrous or sparsely hairy, usually covered with resin-filled pits.

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

(moderately crowded) ascending to spreading;

blades linear to narrowly oblanceolate (terete, sulcate, or flattened), 5–50 × 0.5–2 mm, midnerves obscure or evident abaxially, apices acute, faces glabrous or moderately hairy, gland-dotted (in circular, deep pits), resinous;

axillary fascicles with 1–10 leaves, shorter than subtending leaves.

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.

2–15 mm (bracts 5–10+, leaflike).

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

turbinate to subcampanulate, 4–7 × 2.5–4 mm.

obconic, 9–13 × 6–10 mm.

2–8;

laminae 4–5 × 1–1.8 mm.

0.

6–20;

corollas 5–7 mm.

10–26;

corollas 9–11 mm.

16–24 in 3–5 series, mostly tan, narrowly oblong to elliptic, 1.5–6 × 0.4–0.8 mm, unequal, mostly chartaceous, midnerves evident on at least distal 1/2, slightly to strongly thickened, expanded distally, (margins narrowly membranous, sometimes ciliate distally) apices acute to rounded, abaxial faces glabrous, outer sometimes gland-dotted (sessile), frequently 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 racemiform to thyrsiform arrays (to 50 × 2–15 cm).

borne singly or in cymiform to racemiform arrays.

tan to brown, subcylindric, 3.5–4 mm, moderately to densely hairy;

pappi off-white to brown, 5–8 mm.

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

pappi tan, 8.5–11 mm.

= 18.

= 18.