Total holdings: Over 1,100,000 specimens.

Type specimens: 6,500 specimens

Specialties: California, southwestern U.S., Mexico - especially Baja California, Australia, and other arid regions.  Other specialties include: Russia and former U.S.S.R. republics; Australasia and other Pacific; Cactaceae; Crossosomataceae; Goodeniaceae; Midaceae; Poaceae; Polemoniaceae; Restionaceae; Stylidiaceae; Arctostaphylos; Astragalus; Camissonia; Ceanothus, Cupressus; Iris; Ranunculus; aquatic phanerogams

Desiderata for exchange: Worldwide, with particular emphasis on plants from California, Baja California, arid, semi-arid, and other Mediterranean regions; Worldwide collections of Acanthaceae, Burseraceae, Cactaceae, Iridaceae, Loranthaceae, Poaceae, Polemoniaceae, Viscaceae. Portulacaceae from South American and Africa.  For questions regarding exchange agreements please contact herbarium AT rsabg.org

Important collections include: C. F. Baker, R. C. Barneby, L. Benson, S. Boyd, A. Davidson, C. Davidson, P. H. Davis, M. DeDecker, M. B. Dunkle, F. R. Fosberg, H. S. Gentry, V. Grant, R. Gustafson, G. B. Hinton, E. C. Jaeger, M. E. Jones, C. L. Lundell, Y. E. J. Mexia, P. A. Munz, E. Palmer, F. W. Peirson, C. G. Pringle, P. H. Raven, J. C. Roos, T. S. Ross, A. C. Sanders, R. F. Thorne, L. C. Wheeler, and C. B. Wolf.

If you wish to arrange a loan please contact . Loans Policy