Flora of North America species comparison

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

ascending to spreading, green when young, becoming dark brown then gray, branched, twigs stipitate-glandular, resin coated.

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;

blades elliptic to obovate, 9–18 × 2.5–4 mm, midnerves prominent with 2 fainter, collateral nerves, (margins undulate) apices usually obtuse to rounded, sometimes acute, apiculate, faces stipitate-glandular, resinous;

axillary leaf fascicles reduced or absent.

1–30 mm (bracts 4+, leaflike).

1–15 mm (bracts 3–8, gradually reduced, leafy).

subcampanulate, 5–8 × 2.5–4.5 mm.

obconic, 5–7 × 2.5–3.5 mm.

2–6;

laminae 4–6 × 1–2 mm.

3–4;

laminae elliptic, 1.9–2.5 × 0.6–1.3 mm.

5–14;

corollas 5.5–8 mm.

8–9;

corollas 3.5–5.3 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.

22–30 in 4–5 series, mostly tan, lanceolate to elliptic, 1.5–5 × 0.8–1.2 mm, strongly unequal, chartaceous (bodies abruptly constricted at bases of appendages), midnerves usually inconspicuous, (margins scarious, entire or minutely lacerate) apices acute to acuminate or cuspidate, abaxial faces glabrous, lightly resinous, sometimes gland-dotted.

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

in cymiform arrays.

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, subcylindric to narrowly oblanceoloid, 2.2–4 mm, sericeous;

pappi whitish, 3–5 mm.

= 18.

= 18.