Jon Rebman | Cactus Evolution

Picture of Jon Rebman in the desert with cactus and succulents

Saturday, June 25th at 10 am PST

Jon Rebman
Cactus Evolution and Hybridization with an Emphasis on Baja California Cacti


In this presentation, Dr. Rebman will go over cactus diversity in the Baja California region and discuss the taxonomic challenges of studying opuntioids, especially chollas (Cylindropuntia) and prickly-pears (Opuntia). The talk will explain how hybridization and chromosome number play an important role in creating the cactus diversity found in the region.

Who is Jon Rebman?

Jon P. Rebman, Ph.D. has been the Mary and Dallas Clark Endowed Chair/Curator of Botany at the San Diego Natural History Museum (SDNHM) since 1996. Dr. Rebman is a plant taxonomist and conducts extensive floristic research on the Baja California peninsula and in San Diego and Imperial counties of California. He leads various field classes and botanical expeditions each year and is actively naming new plant species from the region. His primary research interests have centered on the systematics of the Cactus family in Baja California, especially the genera Cylindropuntia (chollas) and Opuntia (prickly-pears).

Dr. Rebman also does general floristic research and he has co-published the new Annotated Checklist of the Vascular Plants of Baja California, Mexico and the most recent edition of the Checklist of the Vascular Plants of San Diego County. He has over 25 years of field experience with surveying and documenting plants including rare and endangered species. As a field botanist, he is a very active collector of scientific specimens with his personal collections numbering over 37,000.

He is the director of the San Diego County Plant Atlas project ( and identifies/verifies all of the new specimens (currently over 71,000) coming into the herbarium through this scientific endeavor. As the curator of the SD Herbarium at the SDNHM, he is in charge of this dried plant specimen collection that contains over 275,000 specimens dating back to the 1870s. Rebman published the newest edition of the Baja California Plant Field Guide with co-author Norman Roberts in 2012, and is working on a new bilingual, plant field guide for the Cape region of Baja California Sur.

“The desert regions of Baja California and southern California satisfy my need for scientific adventure while providing a sense of excitement towards botany, reverence for nature and its unaltered beauty, appreciation for the complexity of natural history, and an overall feeling of peace and purpose.”

Important Details:

Cactus and Succulent Society of America
CSSA Webinar. Saturday, June 25th 10:00 am

Raw Registration Link:…/reg…/WN_uTVyFwmIRJiaOlIag1e7Cw

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