31. Sedum mexicanum Britton, Bull. New York Bot. Gard. 1: 257. 1899.
Herbs, perennial, tufted, glabrous. Stems decumbent, branched, not bearing rosettes. Leaves in whorls of 4(-5), spreading, sessile; blade bright green, not glaucous, linear-elliptic or linear-lanceolate, subterete, 8-20 × 1.9-3 mm, base spurred, not scarious, apex blunt. Flowering shoots erect, branched, 8.5-20 cm; leaf blades linear-elliptic or linear-lanceolate, base spurred; offsets not formed. Inflorescences cymes, 20-50+-flowered, 3-branched; branches scorpioid, 2-forked; bracts similar to leaves, smaller. Pedicels absent. Flowers 5-merous; sepals spreading, distinct basally, green, lanceolate, unequal, 3.3-4.7 × 0.9-1.6 mm, apex acute; petals widely spreading, distinct, golden yellow, elliptic, not carinate, 3.3-4.8 mm, apex acute; filaments yellowish; anthers yellow; nectar scales pale yellow, obovate- to spatulate-subquadrate. Carpels erect, distinct, yellowish green. 2n = 36.
Flowering summer. Disturbed areas; 0-100 m; introduced; Fla.; Mexico; Central America; South America (Colombia); Europe (France, Spain); Asia (Japan, Taiwan).
Sedum mexicanum was described from a specimen collected in Mexico; its closest relatives are in eastern Asia and it may have originated there.