California oak woodland - Photo credit: John Game
About the Consortium

Locations of CCH California Participants

The Consortium of California Herbaria is the organization that supports all herbaria in California. Membership is open to all California herbaria that agree to the terms of the MOU. Data providers need to meet this set of minimum requirements. Current members of CCH are listed at

The Consortium of California Herbaria 1 (CCH1) serves as a gateway to information for California vascular plant specimens housed in herbaria, worldwide. This database includes an extract of the CCH2 vascular plant collections from member herbaria (see below). Originally developed in 2003 around botanical collections from University of California herbaria, the Consortium continues to grow as more collections are added. The database includes over 2.2 million specimen records from 36 institutions, all searchable through a single interface. The California holdings of members are listed in a bar graph and a chart.

For more information about CCH1, see our article A Powerful Resource for Plant Conservation Efforts: The Consortium of California Herbaria Reaches Two Million Specimens, published in Fremontia (2016).

The Consortium of California Herbaria 2 (CCH2) serves as a gateway to information for herbarium specimens housed in California herbaria. These data are updated regularly. Some members have collections of fungi, lichens, and bryophytes; those specimens are included here.

Please send any feedback regarding the specimen data directly to the curator of each member herbarium.

CCH in the Scientific Literature
The CCH maintains a Google Scholar profile of publications since 2007 that have cited data from the CCH. This list is periodically updated and is not exhaustive, although we would like it to be! If you know of or have published an article citing data from the CCH that you would like to see on this list, please contact (Staci Markos).

Georeferencing progress map (click for larger version)
Consortium georeferencing progress

Geographic Data
The consortium also provides coordinate data (latitude/longitude) for as many California specimens as possible. Currently, specimens from all participating institutions are being georeferenced on a county-by-county basis. As of August 2017, ~1,700,000 records (over three quarters) include latitude and longitude. Georeferenced records returned from any Consortium search can be mapped directly from the Consortium accession results page.
See the CCH news page for detailed information about our most recent refresh.

RSABG Georeferencing: a repository of California-centric georeferencing resources maintained by Rancho Santa Ana Botanic Garden

The Yellow Flag Project: an effort to bring attention to incongruencies between georeferenced records and geographic ranges included in the Jepson eFlora.

Please cite data retrieved from the Consortium database: Data provided by the participants of the Consortium of California Herbaria (

Data Use Policy
Curatorial Tools
Technical Information
Minimum Requirements for Participation
Participant Memorandum of Understanding

Consortium Contacts
Jason Alexander, Technical Editor    (
Staci Markos, Administrative Co-Chair    (
Jenn Yost, Administrative Co-Chair    (
Richard L. Moe, Emeritus Technical Editor    (
Ellen Dean, CCH representative to US Virtual Herbarium    (
Mare Nazaire, CCH representative for Southern California    (

California Digital Library; initial funding (2003–2006)
National Science Foundation; planning meeting (2006)
USDA Forest Service; georeferencing (2006 & 2007:Tehama, Trinity, Shasta, and Siskiyou counties)
Andrew W. Mellon Foundation; digitization of type specimens (2008–2013)
Global Biodiversity Information Facility; georeferencing records of non-native specimens (2008–2009)
Institute of Museum and Library Services (Museums for America program); databasing and georeferencing historical specimens collected in San Diego County (2005–2009).
National Science Foundation; databasing, georeferencing, and technical support (2010-2014), with an additional supplement in 2012

Please send questions or comments regarding the development and use of these pages to Jason Alexander (


  Copyright © 2018 Regents of the University of California — Updated November 06, 2018