Plants semiaquatic annuals. Stems 30-90 cm tall. hollow, gray-green. Leaves ovate-lanceolate, lower surfaces initially white pubescent, becoming glabrous., margins undulate, lobed to few toothed. Flowers pedicellate; calyces 5-lobed, usually split along one side; corollas funnelform, white with a blue cast on the outside, white to pink on the inside, both acuminal and interacuminal lobes present. Capsules on reflexed pedicels, 4-5 cm long 3-4 vm in diameter, smooth, ovoid, dehiscing irregularly. with (100-)150-250(-300) seeds per capsule; seeds glossy gray-back.
Datura ceratocaula is native to the highlands of central Mexico but appears to be moving northward, in disturbed areas. It is also known from Cuba. It grows on the edges of and in shallow water, including temporary ponds along roadsides and ephemeral waterholes where cattle gather.
References
Bye, R. 2001. Solanaceae, Potato family. Part 1. Datura L. Journal of the Arizona-Nevada Academy of Sciences 33: Vascular Plants of Arizona 6: 58-64. https://www.jstor.org/stable/40022255.
Hammer K, A. Romeike & C. Tittel. 1983. Vorarbeiten zur monographischen Darstellung von Wildpflanzensortimenten: Datura L., sectiones Vorarbeiten zur onographischen Darstellung von Wildpflanzensortimenten: Datura L., sectiones Dutra Bernh., Ceratocaulis Bernh. et Datura. Kulturpflanze 31: 13–75. https://link.springer.com/article/10.1007/BF02000698.