This list is based primarily on collections by myself, students in California Flora (BOT 343), and students performing vegetation surveys associated with the research program “Responses of the biota of the Cal Poly campus to a sanitary landfill and other urban land uses.” It includes plants of the native coastal sage scrub and oak and walnut woodlands, as well as weeds of roadsides, fallow fields and orchards, and lawns and flowerbeds. Specifically excluded are plants that are intentionally planted (even if native) or not persisting outside cultivation. Two hundred eighteen species are represented, in 53 families.
Native and naturalized plants are indicated by different type styles. Only those plants that were likely to have occurred in the area prior to European settlement are listed as native. Thus, the naturalized species include some (such as the California fan palm, Washingtonia filifera) that are native only in other parts of California.
The list is alphabetic by family and alphabetic by genus and species within family. Major groups (e.g. monocots and dicots) are not separated. Nomenclature intentionally follows The Jepson Manual: Higher Plants of California, ed. James C. Hickman, Univ. California. Hyperlinks to individual species often provide photographs, habitat information, and links to other resources.
The list, like any biotic inventory, is a work in progress.
An earlier species list was published in Clark, Curtis. 1990. Vascular plants of the undeveloped areas of California State Polytechnic University, Pomona. Crossosoma 16(4):1-7. It is available on the Web.