Flora of North America species comparison

ascending to erect, 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 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 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.

1–30 mm (bracts 4+, leaflike).

1–12 mm (bracts 0–3, scalelike).

subcampanulate, 5–8 × 2.5–4.5 mm.

obconic, 12–15 × 4–8 mm.

2–6;

laminae 4–6 × 1–2 mm.

5–8;

laminae 3–4 × 0.7–2 mm.

5–14;

corollas 5.5–8 mm.

8–12;

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.

18–28 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 cymiform to paniculiform arrays (2–9 cm wide).

(3–8) 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 to reddish, ellipsoid, ca. 5 mm, densely hairy;

pappi off-white to brown, 7.5–9 mm.

= 18.