Flora of North America species comparison

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

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

blades ascending, sometimes spreading when older, filiform to narrowly oblanceolate (adaxially sulcate to concave), 10–20 × 1–2 mm, midnerves not evident, apices acute, sometimes apiculate, faces glabrous, regularly gland-dotted (in circular, deep pits), resinous;

axillary leaf fascicles sometimes present, shorter than subtending leaves.

ascending to spreading;

blades linear to narrowly elliptic (usually terete to sulcate adaxially), 10–25 × 0.8–1.5 mm, midnerves obscure to evident, apices usually acute, rarely rounded, sometimes mucronate, faces glabrous or sparsely hairy, gland-dotted (in circular, deep pits), resinous;

axillary fascicles of 2–10 leaves, shorter than subtending leaves.

3–15 mm (bracts 3–20+, mostly leaflike, distal scalelike).

3–20 mm (leafy or bracteate).

turbinate, 3–5 × 3–5 mm.

turbinate, 4–6 × 2–5 mm.

3–6;

laminae 4–5 × 1–2 mm.

usually 0, rarely 1–2;

laminae elliptic, 4–6 × 1–1.5 mm.

6–16;

corollas 5–6 mm.

6–16(–22);

corollas 5–6.5 mm.

12–20 in 3–4 series, tan, linear to lanceolate, 1–3.5 × 0.5–1 mm, unequal, mostly chartaceous, sometimes herbaceous-tipped, erect, midnerves raised, somewhat expanded apically, subapical resin ducts usually present, (margins scarious to narrowly membranous, glabrous or ciliate) apices erect, acute, sometimes apiculate, abaxial faces glabrous.

15–22 in 3–4 series, tan, ovate to elliptic, 2.5–7 × 0.6–1.5 mm, unequal, outer ± herbaceous, mid and inner mostly chartaceous, midnerves darker, strongly raised, uniform in widths, resinous, (margins membranous, ciliate especially distally) apices erect, acute, abaxial faces glabrous.

in irregular cymiform arrays (to 7 cm wide).

in racemiform to paniculiform arrays (1–15 × ca. 8 cm).

tan to brown, turbinate to narrowly oblanceolate, 3.5–4 mm (ribs ca. 5), villous;

pappi off-white to brown, 3.5–5 mm.

tan to purple, 3.5–4 mm (7–8 ribbed), densely hairy;

pappi off-white to brown, sometimes reddish, 5–6.5 mm.

= 18.

= 36.