Flora of North America species comparison

usually erect, simple or branched (laterals often overtopping main stems), pilosulous to hirtellous, glabrate.

mostly cauline (at flowering); alternate; ± sessile;

blades (1- or 3-nerved) narrowly oblanceolate to lance-linear or linear, margins entire, faces glabrous or sparsely hirsutulous.

blades mostly 9–30+ × 1–2(–5+) mm.

often wiry, ± hirsutulous to pilosulous near heads.

± cylindric to turbinate, 1–3(–5+) mm diam.

4–7+ mm.

± flat, obscurely pitted, sparsely paleate (between ray and disc florets, paleae resembling inner phyllaries).

3–13+ (usually 3, 5, or 8), pistillate, fertile;

corollas yellowish, often tinged with red or purple (laminae inconspicuous).

tubes 1.5–2+ mm, laminae narrowly elliptic, 0.3–1 mm.

5–70+, bisexual, fertile;

corollas pale yellow, sometimes tipped with purple, tubes shorter than narrowly funnelform throats, lobes 2–4, erect, ± deltate;

style-branch appendages subulate to filiform.

tubes 0.2–0.4 mm, throats 1–1.5 mm, lobes 0.1–0.3 mm.

11–20+ in 2+ series, 1-nerved (flat) linear to lanceolate or subulate, subequal (distinct), herbaceous, margins scarious, faces hirsutulous (± navicular, each of the inner usually ± enfolding a floret).

radiate, borne singly.

± cylindric to fusiform, little, if at all, compressed, transversely rugulose, all minutely hirsutulous or ray cypselae glabrous or nearly so;

pappi persistent, usually of 3–5 subulate scales (sometimes much reduced or 0 on ray cypselae).

4–5 mm;

pappi 1–4+ mm or much reduced (rays).

= 9.

= 18.