Flora of North America species comparison

prostrate, branched ± throughout (rooting at nodes, usually ± succulent).

cauline; opposite;

sessile or petiolate;

blades (usually 3-nerved) mostly trullate to lanceolate, often obscurely 3-lobed, bases ± cuneate, margins entire or toothed, faces usually scabrous.

obconic, 6–12 mm diam.

convex to conic, paleate (paleae conduplicate, scarious, acute).

4–10+, pistillate, fertile;

corollas yellow to orange.

30–60+, bisexual, fertile;

corollas yellow to orange, tubes shorter than campanulate throats, lobes 5, lance-triangular.

persistent, 12–15 in 2–3 series (outer larger, more foliaceous than inner).

radiate, borne singly.

strongly biconvex to plumply 3–4-angled (epidermes usually thick, corky, smooth or tuberculate, apices rostrate, each bearing central neck or boss, rostra obscure in mature fruits);

pappi 0, or persistent, coroniform (erose or fimbrillate to lacerate, 0.1–0.6 mm).

= 15.