Between March 2006 and February 2015, the occurrence and habitats of the aroid genus Cryptocoryne were investigated in Chiang
Khan District, Loei Province, Thailand. In addition to the well-known Cryptocoryne crispatula Engl. var. crispatula and C. crispatula
var. yunnanensis (H.Li) H.Li & N.Jacobsen, a recently described species was found: C. loeiensis Bastmeijer et al., as well as a number
of plants considered to be hybrids. Although Cryptocoryne is presently abundant, decimation or extinction could occur in the future
because of the dam constructions in the Mekong River.