Flora of North America species comparison

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

erect to spreading, green when young, becoming reddish brown, intricately branched, glabrous or sparsely hairy, sometimes resinous.

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.

ascending to spreading;

blades linear (slightly concave), usually recurved, 5–15 × 0.5–1.5 mm, midnerves evident abaxially, apices acute, usually mucronate, faces glabrous or sparsely hairy, gland-dotted (not in deep pits), ± resinous;

axillary fascicles of 4–7 leaves usually present.

1–30 mm (bracts 4+, leaflike).

1–10 mm (glabrous or with conic hairs, resinous).

subcampanulate, 5–8 × 2.5–4.5 mm.

subcylindric, 10–15 × 3–7 mm.

2–6;

laminae 4–6 × 1–2 mm.

0.

5–14;

corollas 5.5–8 mm.

5–6;

corollas 9–10.5 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.

18–30 in 5–7 series, tan, ovate to elliptic, 2–12 × 1–2.5 mm, unequal, mostly chartaceous, occasionally herbaceous-tipped (mid bodies apically obtuse to truncate), appendages usually herbaceous, often spreading to recurved, midnerves faint, (margins membranous, fimbriate distally, otherwise sometimes ciliolate) apices acute to cuspidate, abaxial faces mostly resinous.

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

borne singly or (2–7) in cymiform arrays (clusters 3–20 mm).

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, turbinate to narrowly oblanceolate, 5–7 mm (ribs 5–7), moderately hairy distally;

pappi off-white to brown, 9–10.5 mm.

= 18.