New Euphorbiaceae from Mexico

This article conta ined descriptions of five new taxa of Mexican Euphorbiaceae. Euphorbia (sub g. Agaloma) na yarensis is endemic to pine-oak woodland in the mount ains of central Nayarit. It appears related to E. so ob yi but differs by possessing linear to linear-ovate leaves. Croton varelae is also endemic to central Nayarit. A key was provided to distinguish this spec ies. a member of sect. Geiseleria, from the seven other Mex ican species of this section. Croton ram illatus var. magniglandulifer occurs in the states of Guerre ro and Morelos. This new varie ty differs from var. ramillatus by the possession of larger petiolar glands . Croton michaelii occurs in Agu ascaliente s and Durango. It is uncertain to which section of Croton this species belongs. It resembl es Croton yecorensis but is distinguished by possessing a lepid ote indumentum and by lacking con spicuous s tipitate glands. Crot on disjun ctus has been coll ected in Chihuahua and Agua scalientes, at localiti es se parated by more than 600 km. Thi s species appears to be most closely akin to Croton fru tic ulosus Torr., from which it is separated by glabrous, ev ident (vs. pube scent, nearl y obso lete) stipules and multifid (vs. bifid) sty les.