Puerto Rico Purslane

Portulaca caulerpoides Britton & Wilson; Britton, Bull Torrey Club 42: 515. 1915.
A fleshy prostrate herb, forming tufts S-12 cm. in diameter, the stems slender, branched, hairy in the axils; leaves alternate, the blades obovoid or globose-obovoid, 2-5 mm. long, 1.2-3 mm. broad, rounded at the apex, narrowed at the base, subsessile, glabrous, shining, with labyrinthine or tortuous mottling; flowers terminal, solitary, surrounded with white hairs and an involucre of obovoid leaves; sepals suborbicular, about 2 mm. long, 2-2.2 mm. broad, rounded at the apex; corolla yellowishwhite; petals broadly obovate, 2.5-3 mm. long, 2-2.5 mm. broad, notched at the apex; capsule subglobose, 1.5 mm. high, 1-1.2 mm. in diameter, circumscissile near the base seeds black, 0.4 mm. wide, granulate.
Type locality: Limestone ro ks, Cayo Muertos, Porto Rico. Distribution: Type locality.