Flora of North America species comparison

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

ascending to spreading, green when young, becoming dark brown then gray, branched, twigs stipitate-glandular, resin coated.

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;

blades elliptic to obovate, 9–18 × 2.5–4 mm, midnerves prominent with 2 fainter, collateral nerves, (margins undulate) apices usually obtuse to rounded, sometimes acute, apiculate, faces stipitate-glandular, resinous;

axillary leaf fascicles reduced or absent.

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

1–15 mm (bracts 3–8, gradually reduced, leafy).

turbinate, 3–5 × 3–5 mm.

obconic, 5–7 × 2.5–3.5 mm.

3–6;

laminae 4–5 × 1–2 mm.

3–4;

laminae elliptic, 1.9–2.5 × 0.6–1.3 mm.

6–16;

corollas 5–6 mm.

8–9;

corollas 3.5–5.3 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.

22–30 in 4–5 series, mostly tan, lanceolate to elliptic, 1.5–5 × 0.8–1.2 mm, strongly unequal, chartaceous (bodies abruptly constricted at bases of appendages), midnerves usually inconspicuous, (margins scarious, entire or minutely lacerate) apices acute to acuminate or cuspidate, abaxial faces glabrous, lightly resinous, sometimes gland-dotted.

in irregular cymiform arrays (to 7 cm wide).

in cymiform arrays.

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, subcylindric to narrowly oblanceoloid, 2.2–4 mm, sericeous;

pappi whitish, 3–5 mm.

= 18.

= 18.