Jeffrey Chemnick

Dioon sonorense is a species of cycad native to northern Mexico.

Dioon argenteum is a species of cycad native to northern Oaxaca, Mexico. It is one of a number of Mexican cycads described by Tim Gregory, S. Salas-Morales, and Jeff Chemnick, including Dioon planifolium.

Ceratozamia whitelockiana is a species of plant in the family Zamiaceae. It is endemic to Mexico, where it is known only from Metates and Chiapan in Oaxaca state. Only two subpopulations have been found, with a total population of about 2200 individuals. The habitat is threatened by conversion to plantations using slash-and-burn techniques. This cycad has a cylindrical trunk about 20 to 30 centimeters long. The leaves are up to 2.5 meters in length and have 30 to 40 pairs of leaflets. The plant was named for cycad expert Loran Whitelock.

Ceratozamia mixeorum is a species of plant in the family Zamiaceae. It is endemic to the Sierra Mixe of Oaxaca state in southern Mexico. Its natural habitat is subtropical or tropical moist montane forests.

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