Flora of North America species comparison

erect to spreading, green when young, fastigiately branched, glabrous or sparsely hairy, gland-dotted, resinous.

erect, much branched, twigs crowded, green when young, becoming reddish brown to gray, glabrous or sparsely hairy, usually covered with resin-filled pits.

mostly ascending to spreading, older deflexed;

blades filiform (sulcate to concave), 25–90 × 0.5–3 mm, midnerves obscure to evident, apices acuminate to attenuate, often mucronate, faces glabrous or sparsely hairy, gland-dotted (in deep, circular pits), resinous;

axillary leaf fascicles sometimes present.

(moderately crowded) ascending to spreading;

blades linear to narrowly oblanceolate (terete, sulcate, or flattened), 5–50 × 0.5–2 mm, midnerves obscure or evident abaxially, apices acute, faces glabrous or moderately hairy, gland-dotted (in circular, deep pits), resinous;

axillary fascicles with 1–10 leaves, shorter than subtending leaves.

1–15 mm (bracts 0–7, scalelike, resembling phyllaries).

2–15 mm (bracts 5–10+, leaflike).

turbinate to subcampanulate, 4–6 × 3.5–4.5 mm.

turbinate to subcampanulate, 4–7 × 2.5–4 mm.

0.

2–8;

laminae 4–5 × 1–1.8 mm.

10–25;

corollas 4–5 mm.

6–20;

corollas 5–7 mm.

20–25 in 3–4 series, tan, narrowly triangular to lanceolate, 1.5–5 × 0.5–1 mm, unequal, mostly chartaceous, midnerves evident, raised, mostly uniform in width to slightly dilated apically, (margins membranous, fimbriate) apices erect, acute, abaxial faces resinous.

16–24 in 3–5 series, mostly tan, narrowly oblong to elliptic, 1.5–6 × 0.4–0.8 mm, unequal, mostly chartaceous, midnerves evident on at least distal 1/2, slightly to strongly thickened, expanded distally, (margins narrowly membranous, sometimes ciliate distally) apices acute to rounded, abaxial faces glabrous, outer sometimes gland-dotted (sessile), frequently resinous.

in rounded, cymiform arrays (to 10 cm wide).

in racemiform to thyrsiform arrays (to 50 × 2–15 cm).

tan to brown, narrowly turbinate, 2–3 mm (5-ribbed), hairy;

pappi tan, 3.5–4.5 mm.

tan to brown, subcylindric, 3.5–4 mm, moderately to densely hairy;

pappi off-white to brown, 5–8 mm.

= 18.

= 18.