Flora of North America species comparison

simple, erect or procumbent, rigid (woody proximally), herbaceous and leafy distally (dying back annually), striate-angled, glabrous, non-resinous.

erect to ascending, slender, striate-angled, glabrous, scarcely resinous.

present at flowering;

sessile;

blades (1-nerved) linear to narrowly lanceolate, 10–40 × 1–4 mm, bases narrowed, margins minutely undulate, apices acute, faces glabrous, gland-dotted (distal leaves reduced, scalelike).

usually present at flowering;

sessile;

blades (1-nerved) linear-oblanceolate to narrowly oblong, 20–40(–80) × 4–8 mm, bases cuneate, margins evenly serrate (teeth spinulose, apices acute, faces finely gland-dotted, not resinous).

campanulate;

staminate 4–7 mm, pistillate 7–9 mm.

campanulate;

staminate 3–6 mm, pistillate 3–6 mm.

20–30;

corollas 3.5–4 mm.

30;

corollas 2.2–3 mm.

15–20;

corollas 4–5 mm.

20–30;

corollas 3 mm.

lanceolate, 1–7 mm, margins scarious, erose-ciliate, medians green (midribs dark, keeled, dilated), apices acute to acuminate (erose-ciliate, abaxial faces glabrous, minutely papillose-gland-dotted).

lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).

(on short peduncles) in loose corymbiform arrays.

(10–50+) in terminal, compact, rounded paniculiform arrays.

3–5 mm, prominently 6–8-nerved, glabrous;

pappi 11–14 mm.

1.5–2.2 mm, 5-nerved, glabrous;

pappi 4–6 mm.