Flora of North America species comparison

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

erect to ascending or divergent, much branched, sparsely hairy (hairs low, conic), resinous.

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.

ascending to spreading, distally recurved;

blades narrowly obovate (sometimes conduplicate), 6–12 × 2–4 mm, midnerves raised adaxially, (margins often undulate) apices acute, mucronate to cuspidate, faces gland-dotted to resinous;

sometimes with axillary fascicles of 1–7 leaves.

3–20 mm (leafy or bracteate).

1–15 mm (bracts 0 or 1–4, scalelike).

turbinate, 4–6 × 2–5 mm.

narrowly campanulate, 8–12 × 4–6 mm.

usually 0, rarely 1–2;

laminae elliptic, 4–6 × 1–1.5 mm.

4–7;

laminae (white) 4–5.5 × 1–2 mm.

6–16(–22);

corollas 5–6.5 mm.

10–18;

corollas (white) 5.5–7 mm.

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.

22–28 in 4–6 series, green to tan, squarrose or reflexed (outer), ovate to oblong, 2.5–7 × 0.6–1.5 mm, unequal, outer herbaceous or herbaceous-cuspidate, innermost chartaceous (bodies usually apically obtuse to retuse proximal to appendages), midnerves and subapical resin ducts darker, apices acute to acuminate, abaxial faces glabrous, resinous.

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

usually borne singly, sometimes in cymiform to racemiform arrays (4–6 cm wide).

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

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

tan to brown, narrowly turbinate, 3.5–4 mm (5-ribbed), densely pilose, sericeous to villous;

pappi whitish, 5–6.5 mm.

= 36.

= 18.