Flora of North America species comparison

erect to ascending, green when young, fastigiately branched, gland-dotted (in pits), resinous.

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

mostly ascending to spreading;

blades filiform (adaxially sulcate), 10–35 × 0.5–1.5 mm, midnerves obscure, apices acute to obtuse or rounded, faces glabrous, gland-dotted (in circular, deep pits), 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.

0.5–2 mm (bracts 0–3, mostly like outer phyllaries).

3–30 mm (leafy).

obconic, 5–9 × 2–5 mm.

subcampanulate, 5–8 × 3.5–5.5 mm.

0.

3–10;

laminae 5.5–7 × 1.5–2 mm.

5–7;

corollas 5.8–8 mm.

11–25;

corollas 5–8 mm.

16–20 in 3–5 series (in vertical ranks), tan, lanceolate to oblong, 1–7 × 0.5–1.5 mm, strongly unequal, mostly chartaceous, midnerves mostly obscure, apices acute to rounded (outer each tipped with subspheric resin-gland), abaxial faces resinous.

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.

in cymiform to racemiform arrays (1–3 cm wide).

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

tan to brown, narrowly ellipsoid, 3–4 mm, sericeous;

pappi off-white to brown, 6–7.5 mm.

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

pappi off-white to brown, 6–7.5 mm.

= 18.

= 18.