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This article contained descriptions of five new taxa of Mexican Euphorbiaceae. Euphorbia (subg. Agaloma) nayarensis is endemic to pine-oak woodland in the mountains of central Nayarit. It appears related to E. soobyi but differs by possessing linear to linear-ovate leaves. Croton varelae is also endemic to central Nayarit. A key was provided to distinguish this species, a member of sect. Geiseleria, from the seven other Mexican species of this section. Croton ramillatus var. magniglandulifer occurs in the states of Guerrero and Morelos. This new variety differs from var. ramillatus by the possession of larger petiolar glands. Croton michaelii occurs in Aguascalientes and Durango. It is uncertain to which section of Croton this species belongs. It resembles Croton yecorensis but is distinguished by possessing a lepidote indumentum and by lacking conspicuous stipitate glands. Croton disjunctus has been collected in Chihuahua and Aguascalientes, at localities separated by more than 600 km. This species appears to be most closely akin to Croton fruticulosus Torr., from which it is separated by glabrous, evident (vs. pubescent, nearly obsolete) stipules and multifid (vs. bifid) styles.

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© 2000 Victor W. Steinmann

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