Flora of North America species comparison

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

erect, green when young, becoming tan, branched, glabrous, resinous.

ascending to spreading;

blades linear to narrowly oblanceolate (terete or adaxially sulcate), 12–35 × 0.5–1.5 mm, midnerves obscure, apices acute, often mucronate, faces glabrous or moderately hairy, gland-dotted (in circular, deep pits), resinous;

axillary fascicles of 4–10 leaves, shorter than subtending leaves.

ascending;

blades oblanceolate, 7–30 × 1.5–3 mm, midnerves evident, apices acute to apiculate, faces glabrous, resinous;

axillary leaf fascicles usually present, much shorter than subtending leaves.

3–30 mm (leafy).

1–12 mm (bracts 0–3, scalelike).

subcampanulate, 5–8 × 3.5–5.5 mm.

obconic, 12–15 × 4–8 mm.

3–10;

laminae 5.5–7 × 1.5–2 mm.

5–8;

laminae 3–4 × 0.7–2 mm.

11–25;

corollas 5–8 mm.

8–12;

corollas 9–10.5 mm.

20–26 in 4–6 series, tan, ovate to lanceolate or oblong, 3–7 × 1–1.8 mm, unequal, mostly chartaceous, outermost ± herbaceous-appendaged, midnerves thickened, darker resin ducts, slightly expanded apically, (margins membranous, fimbriate, especially distally) apices erect, acuminate to cuspidate, inner and mid acute to acuminate, abaxial faces usually glabrous, resinous.

18–28 in 3–4 series, tan, ovate or lanceolate to elliptic, 8–12 × 1–2.5 mm, subequal, outer herbaceous-tipped, inner mostly chartaceous, apices erect, acute or acuminate to cuspidate, abaxial faces glabrous, resinous.

in racemiform to thyrsiform-paniculiform arrays (to 30 × 3–12 cm).

(3–8) in cymiform arrays.

tan to brown, subobovoid, 3.5–5 mm, glabrous or moderately hairy, more densely distally;

pappi off-white to brown, 6–7.5 mm.

tan to reddish, ellipsoid, ca. 5 mm, densely hairy;

pappi off-white to brown, 7.5–9 mm.

= 18.