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.

8–20(–30) mm, circular to flattened in cross section;

axillary leaves 2–10 per fascicle.

(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.

2–15 mm (bracts 5–10+, leaflike).

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

6–12(–14).

2–8;

laminae 4–5 × 1–1.8 mm.

6–20;

corollas 5–7 mm.

midnerves typically not evident on proximal 1/2, outer and mid subapical resin ducts strongly thickened.

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.

in racemiform to thyrsiform arrays (to 50 × 2–15 cm).

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

pappi off-white to brown, 5–8 mm.

= 18.

= 18.