Flora of North America species comparison

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

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

usually ascending or spreading;

blades filiform to narrowly oblanceolate (terete or flattened, adaxially sulcate to concave), 12–55 × 0.5–3 mm, midnerves evident, usually not raised, apices acute to acuminate, faces glabrous or sparsely hairy, gland-dotted (in circular, deep pits), resinous;

axillary fascicles of 2–15 leaves, 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.

20–70 mm (mostly ebracteate).

3–20 mm (leafy or bracteate).

hemispheric, 8–14 × 8–18 mm.

turbinate, 4–6 × 2–5 mm.

3–18;

laminae elliptic to lanceolate, 7–15 × 2–5 mm.

usually 0, rarely 1–2;

laminae elliptic, 4–6 × 1–1.5 mm.

16–60;

corollas 6–10 mm.

6–16(–22);

corollas 5–6.5 mm.

24–32 in 2–3 series, green to tan, ovate to lanceolate, 4–10 × 0.5–3 mm, subequal, outer sometimes wholly herbaceous, usually mostly chartaceous, sometimes with green, medial stripes, midnerves conspicuous, raised, 1–2 collateral nerves often present, (margins membranous, minutely lacerate to fimbriate) apices acute to acuminate, abaxial faces usually glabrous, sometimes sparsely hairy, often stipitate-glandular, resinous.

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.

usually borne singly.

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

tan to brown, narrowly oblanceoloid, somewhat flattened, 4–5 mm (2-ribbed), sericeous to villous;

pappi silvery, 5.8–7 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.