Sergio Sabato

Dioon merolae is a species of cycad that is native to Chiapas and Oaxaca, Mexico. It is known from the municipalities of Cintalapa and Villaflores in Chiapas, and from the Sierra Juárez, Oaxaca.

Dioon califanoi is a species of cycad that is native to Oaxaca and Puebla states, Mexico. It is found near Teotitlán del Camino and Huautla de Jiménez.

Dioon tomasellii is a species of cycad in the family Zamiaceae. It is endemic to Mexico, where it occurs in the states of Durango, Guerrero, Jalisco, Michoacán, and Nayarit. This plant grows in oak and pine-oak forest and woodland habitat. Threats to the species include destruction of the habitat for agriculture and overcollection for horticultural purposes. This species was first described in 1984. It was revised in 1997, with one variety being elevated to species status as Dioon sonorense.

Dioon rzedowskii is a species of cycad that is endemic to Oaxaca, Mexico. It occurs in the Rio Santo Domingo valley, near the villages of San Bartolomé Ayautla and San Pedro Teutila.

Dioon holmgrenii is a species of cycad in the family Zamiaceae. It is endemic to Mexico, where it occurs only in an area just to the southwest of San Gabriel Mixtepec, Oaxaca. It is known by the common name palma del sol (sun palm). This plant grows in humid pine-oak forest habitats. There are only two known subpopulations.

Dioon caputoi is a species of cycad that is native to the state of Puebla, Mexico. It is found near Loma de la Grana, located 6 km southwest of San Luis Atolotitlán (formerly San Luis Tultitlanapa), Caltepec. It is protected by the Tehuacán-Cuicatlán Biosphere Reserve. As of 2018, there are only five or six known populations of Dioon caputoi remaining in the wild. Within each population are between 50 and 120, primarily adult, specimens that are distributed randomly throughout the dry scrubland. The total mature population now stands at an estimated 2,000 to 2,500 individuals.

Ceratozamia euryphyllidia is a species of plant in the family Zamiaceae. It is found in Guatemala and in the Mexican state of Oaxaca and Veracruz (in the isthmus of Tehuantepec region). It is threatened by habitat loss.

Zamia vazquezii is a species of plant in the family Zamiaceae. It is endemic to northern Veracruz state, in eastern Mexico. It is a Critically endangered species, threatened by habitat loss. There are only two wild populations with no more than a combined total of 50 individuals. The specific name vazquezii refers to Mario Vázques Torres, first collector of the plant.

Zamia disodon is a species of plant in the family Zamiaceae. It is a subshrub endemic to Colombia.

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