Flora of North America species comparison

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

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

mostly ascending to spreading;

blades filiform (adaxially sulcate), 10–35 × 0.5–1.5 mm, midnerves obscure, apices acute to obtuse or rounded, faces glabrous, gland-dotted (in circular, deep pits), resinous.

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.

0.5–2 mm (bracts 0–3, mostly like outer phyllaries).

1–15 mm (bracts 0 or 1–4, scalelike).

obconic, 5–9 × 2–5 mm.

narrowly campanulate, 8–12 × 4–6 mm.

0.

4–7;

laminae (white) 4–5.5 × 1–2 mm.

5–7;

corollas 5.8–8 mm.

10–18;

corollas (white) 5.5–7 mm.

16–20 in 3–5 series (in vertical ranks), tan, lanceolate to oblong, 1–7 × 0.5–1.5 mm, strongly unequal, mostly chartaceous, midnerves mostly obscure, apices acute to rounded (outer each tipped with subspheric resin-gland), abaxial faces resinous.

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

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

tan to brown, narrowly ellipsoid, 3–4 mm, sericeous;

pappi off-white to brown, 6–7.5 mm.

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

pappi whitish, 5–6.5 mm.

= 18.

= 18.