| The San José State University Botany Garden |
Arno, S.F. and Hammerly, R.P. 1977. Northwest Trees. Washington: The Mountaineers.
E-Floras
Lady Bird Johnson Wildflower Center — The University of Texas at Austin
Las Pilitas Nursery
Stuart, J.D. and Sawyer, J.O. 2001. Trees and Shrubs of California. Berkeley: University of California Press.
Theadore Payne Foundation for Wildflowers and Native Plants, Inc.
USDA Plants Database
US Forest Service
University of Michigan-Dearborn "Native American Ethnobotany"