Flora of North America species comparison

ascending to erect, green when young, fastigiately branched, glabrous or sparsely hairy, resinous.

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

ascending to spreading;

blades filiform (terete or adaxially sulcate), 3–18(–23) × 0.3–1 mm, midnerves obscure, apices acute, often mucronate, faces glabrous or hairy, gland-dotted (in circular, deep pits), resinous;

axillary fascicles of 2–12 leaves, shorter than subtending leaves.

(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.

1–30 mm (bracts 4+, leaflike).

2–15 mm (bracts 5–10+, leaflike).

subcampanulate, 5–8 × 2.5–4.5 mm.

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

2–6;

laminae 4–6 × 1–2 mm.

2–8;

laminae 4–5 × 1–1.8 mm.

5–14;

corollas 5.5–8 mm.

6–20;

corollas 5–7 mm.

16–24 in 3–5 series, mostly tan, ovate to elliptic, 2.5–7 × 0.6–1.5 mm, unequal, outer ± herbaceous or herbaceous-appendaged, mid and inner mostly chartaceous, midnerves raised, subapical resin ducts darker, ± thickened, expanded apically, (margins ciliate) apices erect, acute to acuminate or mucronate to cuspidate, abaxial faces glabrous or sparsely hairy.

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 cymiform to paniculiform arrays (2–9 cm wide).

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

tan to brown, subcylindric, 2.5–4 mm (ribs 8–10), glabrous or hairy, more densely distally;

pappi off-white to brown, 5–7 mm.

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

pappi off-white to brown, 5–8 mm.

= 18.

= 18.