Syn. Pl. 2: 397. 1807.

Etymology: For J. H. Jaume St. Hilaire, 1772–1845, French botanist
Treatment appears in FNA Volume 21. Treatment on page 253.

Perennials, to 30+ cm (rhizomatous or stoloniferous). Stems sprawling, ascending, branched mostly from bases. Leaves opposite; sessile; blades spatulate to linear (succulent), margins entire, faces glabrous. Heads radiate [discoid], borne singly. Involucres cylindric to obconic, 4–8+ mm diam. Phyllaries 12–15 in 3+ series (ovate to lanceolate, unequal, succulent to membranous). Receptacles conic, epaleate. Ray florets [0] 3–10, pistillate, fertile; corollas yellow. Disc florets 20–50+, bisexual, fertile; corollas yellow, tubes about equaling narrow, cylindric throats, lobes 5, deltate. Cypselae obconic to clavate or columnar (10-ribbed, glabrous); pappi usually 0, rarely persistent, of 1–5 subulate scales. x = 19.


w North America, nw Mexico, South America.


Species 2 (1 in the flora).

Selected References


Lower Taxa