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.

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

± 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).

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.

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).

= 9.