Resources and References:

1.  Lady Bird Johnson Wildlife Center, Joe Marcus, e-mail correspondence

2.  California Master Gardeners, UC Davis, Pam Geisel, e-mail corresondence

A Flora of the Santa Rosa Plateau, Southern California

Earl W. Lathrop & Robert F. Thorne
Southern California Botanists, Special Publication No. 1

The Jepson Manual  Higher Plants of California

Edited by James C. Hickman
University of California Press Berkeley, Los Angeles, London

The Vascular Plants of Western Riverside County, California
An Annotated Checklist

Fred M. Roberts, Jr., Scott D. White, Andrew C. Sanders, David E. Bramlet, & Steve Boyd
F.M. Roberts Publications, San Luis Rey, California

Flora of Southern California

Philip A. Munz
University of California Press, Berkeley, Los Angeles, London

Landscape Plants for Western Regions

Robert C. Perry
Land Design Publishing, Claremount, CA 91711

Tom Chester- Excellent Field Guide site of The Santa Rosa Plateau, San Bernardino and San Jacinto Mountains, San Diego County, and the San Gabriel Mountains.
www.tchester.org