Directory       News       Site Map       Home
Flowering plant - Madia elegans "densifolia" - Photo credit: Bruce G. Baldwin (click for Baldwin Lab) Calochortus pulchellus
Welcome to the Jepson Flora Project
The Jepson Flora Project brings together all of the floristic references and data of the Jepson Herbarium. Resources of the Flora Project are directly linked to the Consortium of California Herbaria, CalPhotos, the California Native Plant Society, California Exotic Pest Plant Council, USDA-Plants database, and many other external sites. The Friends of the Jepson Herbarium help the Jepson Flora project carry out its work.

The online component of the Jepson Flora Project, provides users with a single interface from which they can find the most comprehensive, scientifically accurate sources of information on the California flora. Click on the "Read more" links below to learn more about each resource.

Jepson Online Interchange

The Jepson Online Interchange provides the latest information on identification, taxonomy, distribution, ecology, relationships, and diversity of California vascular plants. The professional resources of the Jepson Herbarium assure high quality, with editorial review of all scientific content. Read more...
Manual image

The second edition of The Jepson Manual: Vascular Plants of California (TJM2) was published in 2012 and treats the nearly 8,000 vascular plant taxa native or naturalized in California. Since its publication, some treatments have been revised. Updates are available via the Jepson eFlora.
Find links to additional publications of the Jepson Herbarium at
Errata and other small changes for TJM2 are at

clade image

The Jepson eFlora contains taxonomic treatments for native and naturalized plants occurring in wildlands or otherwise outside of cultivation in California. Documented waifs and some agricultural weeds are also included. Treatments were initially derived from the second edition of The Jepson Manual: Vascular Plants of California (2012).

The eFlora has diverged from the print book in that it: (1) contains descriptions not in the print book (e.g., waifs, agricultural weeds); (2) contains errata and other changes made relative to the print book; (3) contains direct links to the Consortium of California Herbaria; (4) contains direct links to the Online Interchange for California Floristics; and (5) contains substantive revisions of scientific content for some taxa; see Supplement 1, July 2013.

Index to California Plant Names (ICPN) The Index to California Plant Names (ICPN) is intended to account for names people are likely to encounter, from whatever source, and to summarize the status of such names with respect to the flora of California as it is understood presently by authors contributing to the Jepson eFlora.
Jepson Fieldbooks Willis Linn Jepson's Field Books from 1883 to 1945 are available online. In these 71 field books Jepson recorded botanical, biographic, geographic, and historical observations in great detail. The references to specimens (by collection number) are linked to the display of specimen label information (including post-Jepson annotations) in the Consortium of California Herbaria pages. Read more...
See also: Resources based on the 1993 Jepson Manual

  Roadside Flowers - Bear Valley, Colusa County, California - Photo credit: John Game