Perennials, mostly 30–200 cm. Stems prostrate, branched ± throughout (rooting at nodes, usually ± succulent). Leaves 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. Heads radiate, borne singly. Involucres obconic, 6–12 mm diam. Phyllaries persistent, 12–15 in 2–3 series (outer larger, more foliaceous than inner). Receptacles convex to conic, paleate (paleae conduplicate, scarious, acute). Ray florets 4–10+, pistillate, fertile; corollas yellow to orange. Disc florets 30–60+, bisexual, fertile; corollas yellow to orange, tubes shorter than campanulate throats, lobes 5, lance-triangular. Cypselae 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). x = 15.

Distribution

Introduced; Mexico, West Indies, Bermuda, Central America, South America, Asia, Indian Ocean Islands, Pacific Islands, Australia.

Discussion

Species 4 (1 in the flora).

Selected References

None.

Lower Taxa

Sphagneticola trilobata