Gilberto Ocampo

Advisor: Dr. J. Travis Columbus

My project involves systematics of Portulaca (Portulacaceae). The genus comprises 40 to 150 species distributed worldwide, mainly in tropics and temperate zones, with centers of diversity in South America and Africa. Although circumscription of Portulaca is well defined, the circumscriptions and number of species are less certain.

The goals of my research project are:

1.- Obtain estimates of the phylogeny of Portulaca. Using chloroplast and nuclear DNA markers, the monophyly of the genus will be tested, and its major lineages will be identified, comparing these results with Legrand’s (1958) infrageneric classification. The relationship between Portulaca and the other genera in the family will be investigated, as well as the relationship between Portulacaceae and Cactaceae. The results will be compared with existing classifications and, if warranted, a new classification will be proposed.

2.- Analyze character evolution (habit, hairs, capsule, seed coat micromorphology, among others), as well as biogeography of Portulaca, using the resulting phylogenies.

3.- Describe the leaf anatomy of Portulaca and representatives of other genera in the family. Results will be used to determine if a correlation exists between leaf anatomy and photosynthetic pathway. It will be established if these data will provide additional taxonomic and phylogenetic characters. In addition, the characters will be mapped onto the molecular phylogenies.

Curriculum vitae


Bachelor in Biology, Universidad Autónoma de Querétaro. Querétaro, Mexico. January, 1997.

Professional Experience

Instituto de Ecología, A.C. (México). Collaborator as author for the project of Flora del Bajío y de regiones adyacentes and curator of the IEB herbarium’s database. 1998-2004.

Universidad Autónoma de Querétaro (México). Flora database coordinator for the diagnostic study of the “Sierra Gorda” Biosphere Reserve. 1996.


Ocampo, G. 2004. Fascicle 39. Buddlejaceae. Flora del Valle de Tehuacán-Cuicatlán. Instituto de Biología, Universidad Nacional Autónoma de México.

Ocampo, G. & A. Medellín. 2004. Catálogo de ejemplares tipo del herbario IEB (México) (Type specimen catalog of the IEB herbarium (Mexico)). Acta Bot. Mex. 67: 1-41.

Ocampo, G. 2003. Portulaca matthewsii (Portulacaceae), a new species from the “Sierra Gorda” Biosphere Reserve, Querétaro, Mexico. Sida 20: 1357-1361.

Ocampo, G. 2003. Fascicle 120. Plantaginaceae. Flora del Bajío y de regiones adyacentes. Pp. 1-19.

Ocampo, G. 2003. Fascicle 115. Buddlejaceae. Flora del Bajío y de regiones adyacentes. Pp. 1-31.

Ocampo, G. 2003. Nota sobre la presencia de Portulaca rubricaulis H.B.K. (Portulacaceae) en la Península de Yucatán (Note on the presence of Portulaca rubricaulis H.B.K. (Portulacaceae) in the Peninsula of Yucatán). Acta Bot. Mex. 63: 59-66.

Ocampo, G. 2003. Una combinación nueva en Phemeranthus (Portulacaceae) (A new combination in Phemeranthus (Portulacaceae)). Acta Bot. Mex. 63: 55-57.

Ocampo, G. 2002. Una especie nueva de Portulaca (Portulacaceae) del norte de Michoacán (México) (A new species of Portulaca (Portulacaceae) from north Michoacán (Mexico)). Sida 20: 487-493.

Ocampo, G. 2002. Fascicle 102. Aizoaceae. Flora del Bajío y de regiones adyacentes. Pp. 1-11.

Ocampo, G. 2002. Una especie nueva de Portulaca (Portulacaceae) del estado de Guanajuato (México) (A new species of Portulaca (Portulacaceae) of the state of Guanajuato (Mexico)). Acta Bot. Mex. 58: 1-6.

Ocampo, G. 2002. Fascicle 101. Molluginaceae. Flora del Bajío y de regiones adyacentes. Pp. 1-7.

Ocampo, G. 2002. Transferencia de tres especies mexicanas de Talinum Adans. a Phemeranthus Raf. (Portulacaceae) (Transfer of three Mexican species of Talinum Adans. to Phemeranthus Raf. (Portulacaceae)). Acta Bot. Mex. 59: 75-80.

Ocampo, G., J. Quesada and R. Aguirre. 2002. Árboles y arbustos de la cuidad de Querétaro (Trees and bushes of the city of Querétaro, México). Rapid Color Guide #138, version 1.3. The Field Museum, Chicago. U.S.A.

Ocampo, G. 2000. Fascicle 89. Primulaceae. Flora del Bajío y de regiones adyacentes. Pp. 1-21.