Flora of North America species comparison

erect and slender or short and branched, prominently striate-angled, glabrous, eglandular.

erect, fastigiate, striate-angular, green, glabrous, resinous.

(reduced) proximal often withered and absent at flowering;

sessile;

blades oblanceolate to narrowly oblong, 5–10(–25) × 1–3(–7) mm (thin), bases narrowed, margins entire or finely serrate (teeth aristate), faces eglandular, not resinous (distal reduced to linear or oblong scales).

cauline (proximal withering and sparse by flowering);

sessile;

blades (1-nerved) broadly oblanceolate to obovate or spatulate, 10–35 × 5–15 mm (thick, firm), bases attenuate, margins entire or irregularly serrate (teeth 1–4, distal leaves entire), apices obtuse to acute, faces glabrous, gland-dotted, resinous.

broadly campanulate to hemispheric; staminate 5–9 mm, pistillate 9–14 mm.

funnelform to campanulate; staminate 3–5 mm, pistillate 3–5 mm.

20–30;

corollas 3–5 mm.

15–30;

corollas 1.6–2.7 mm.

20–30;

corollas 4.5–6 mm.

24–33;

corollas 2–3.5 mm.

narrowly lanceolate, 2–6 mm (not keeled), medians green or brown, margins scarious, apices acute or acuminate (erose, abaxial faces glabrous, eglandular).

ovate to linear-lanceolate, 1–5 mm, margins scarious, erose, medians green, apices rounded to acute, glabrous, gland-dotted, resinous.

usually borne singly (terminal on slender branches).

(sessile or short-pedunculate on lateral branches) in crowded paniculiform arrays.

3–5 mm, strongly 5–10-nerved, papillose-roughened, glandular;

pappi 15–20 mm (often brownish).

1–2 mm, prominently 10-nerved, glabrous;

pappi 1.7–3.1 mm.

= 18.

= 18.