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, green when young, becoming brown, branched proximally, densely floccose-tomentose, eglandular.

(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;

blades linear (adaxially sulcate), 10–30 × 1–2 mm, midnerves evident, apices acute, faces mostly densely tomentose, stipitate-glandular;

sometimes with axillary leaf fascicles.

2–15 mm (bracts 5–10+, leaflike).

2–20 mm (usually leafy).

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

obconic, 9–11 × 6–9 mm.

2–8;

laminae 4–5 × 1–1.8 mm.

0.

6–20;

corollas 5–7 mm.

10–22;

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.

20–30 in 2–3 series, green to tan, oblong to lanceolate, 5–10 × 0.8–1.5 mm, subequal, mostly chartaceous, outer herbaceous or herbaceous-tipped, midnerves usually evident, apices acute to acuminate, abaxial faces hairy, stipitate-glandular.

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

borne singly or in cymiform arrays.

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

pappi off-white to brown, 5–8 mm.

brownish, narrowly oblong, 5–6 mm, densely hairy;

pappi tan, 8–10 mm.

= 18.