Instituto Politcnico Nacional Apartado Postal 1756411410 Mxico DF Mexico

This institution has long been involved in important floristic and ecological studies of the Mexican flora. Collections of cacti include those of C. G. Pringle, J. Rzedowski, and I. L. Wiggins.

Herbario Nacional de México, Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México (MEXU) Apartado Postal 70-233,04510 México, D.F., Mexico This is the most important cactus herbarium in Mexico, including cactus specimens from collectors including S. Arias, H. Bravo H., D. Gold, H. Hernández, E. Matuda, E. Palmer, C. G. Pringle, H. Sánchez-Mejorada, and L. Scheinvar.

Lois Porter Earle Herbarium, Desert Botanical Garden (DES) 1201 North Galvin Parkway, Phoenix, Arizona 85008, U.S.A. For more than 50 years this herbarium has received cactus specimens of active researchers, especially those working in the southwestern United States. Some of the most important cactus collections include those of E. F. Anderson, M. Baker, B. Parfitt, D. Pinkava, W. Hodgson, and F. Kattermann.

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