Flora of North America species comparison

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

erect to ascending, green, becoming tan, branched, stipitate-glandular.

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 obovate to spatulate (flat), 10–30 × 4–12 mm, midnerves evident (1–2 collateral nerves sometimes present, abaxial reticulum of secondary veins often evident), (margins often undulate) apices obtuse, apiculate, faces densely stipitate-glandular;

axillary fascicules usually absent.

3–30 mm (leafy).

1–7 mm (stipitate-glandular).

subcampanulate, 5–8 × 3.5–5.5 mm.

obconic, 6–8 × 4–7 mm.

3–10;

laminae 5.5–7 × 1.5–2 mm.

4–9;

laminae elliptic, 3.5–6 × 1.2–1.8 mm.

11–25;

corollas 5–8 mm.

9–15;

corollas 6.2–6.8 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.

22–28 in 4–6 series, tan, ovate to elliptic, 1–6 × 0.5–1.2 mm, strongly unequal, mostly chartaceous, midnerves evident, (margins narrowly membranous, entire or minutely lacerate) apices acute to acuminate, abaxial faces mostly stipitate-glandular, resinous.

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

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

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 brown, columnar, 3.5–4.5 mm [ribs unknown], villous;

pappi tan, 4–5.5 mm.

= 18.

= 36.