Flora of North America species comparison

1, erect [sprawling], branched throughout.

cauline; opposite; obscurely petiolate;

blades 1–2-pinnately or -pedately lobed (ultimate lobes narrowly lanceolate to filiform [lanceolate to ovate]), ultimate margins entire, faces usually glabrous, rarely hairy [pilose].

± campanulate to turbinate, 3–5+ mm diam.

flat to convex, paleate;

paleae falling, (stramineous with red-brown striae) lance-linear to lanceolate, membranous to scarious [adnate to cypselae].

0, or [1–]5–8, pistillate, fertile [styliferous and sterile or neuter];

corollas [orange] yellow to pale yellow or white [purplish].

[5–]12–25[–30+], bisexual, fertile;

corollas yellow with red-brown nerves, tubes shorter than narrowly funnelform throats, lobes 5, ± deltate.

persistent, 5–8[–13+] in ± 2 series, distinct, (green to stramineous with red-brown to purplish nerves) ovate to oblong, ± equal, membranous, margins scarious.

of (0–)1–3+ linear to subulate, herbaceous bractlets.

usually radiate, sometimes discoid, in open, corymbiform to paniculiform arrays [borne singly].

(blackish or red-brown to stramineous) obcompressed, ± oblanceolate, faces smooth or ± granular-papillate, margins ± winged, wings ± corky, ± pectinate [entire];

pappi 0, or persistent, of 1–2 retrorsely [antrorsely] barbellate awns.

= 12.