Flora of North America species comparison

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

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

ascending to spreading;

blades filiform (terete or flattened), 5–25 × 1–2 mm, midnerves obscure, apices acute often mucronate, faces glabrous or sparsely hairy, regularly gland-dotted (in circular, deep pits), resinous;

axillary fascicles of 2–10 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.

1–15 mm (bracts 3+, leaflike).

1–12 mm (bracts 0–3, scalelike).

subcampanulate, 6–8.5 × 5–7 mm.

obconic, 12–15 × 4–8 mm.

4–6;

laminae 4.5–6 × 1.2–2 mm.

5–8;

laminae 3–4 × 0.7–2 mm.

18–25;

corollas 6.5–8 mm.

8–12;

corollas 9–10.5 mm.

22–26 in 3–5 series, yellowish tan, ovate to lanceolate, 2.5–7 × 0.6–1.5 mm, unequal, mostly chartaceous, midnerves evident, sometimes with 1–2, collateral nerves, ± thickened, raised, often expanded distally, subapical resin ducts darker, narrow and only slightly thickened, (margins membranous, erose-ciliate) apices erect, acute to acuminate or cuspidate, abaxial faces glabrous or sparsely hairy.

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.

mostly borne singly, sometimes in cymiform to racemiform arrays (4–6 cm wide).

(3–8) in cymiform arrays.

tan to brown, subcylindric, 3.5–4 mm, sericeous to villous;

pappi off-white to reddish brown, 6.5–8 mm.

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

pappi off-white to brown, 7.5–9 mm.

= 18.