California oak woodland - Photo credit: John Game

  January 1, 2021

This page is no longer updated. This is an archived version of the pre-2018 CCH website. For the new website, please use this link

About the Consortium

Locations of CCH California Participants
Georeferencing progress map (click for larger version)
Consortium georeferencing progress
The Consortium of California Herbaria serves as a gateway to information from California vascular plant specimens that are housed in participant herbaria. Records from the California Floristic Province portion of Baja California, Mexico are also included. The database includes over 2 million specimen records from 36 institutions, all searchable through a single interface. Originally developed in 2003 around botanical collections from University of California herbaria, the Consortium continues to grow as more collections are added.

The data included in this database represent an extract of the California vascular plant collections at participating institutions. These data are updated regularly. Some of the partner institutions also serve their specimen data through an independent portal. Links to participant webpages are available from the participant directory. Some participating herbaria have collections of fungi, lichens, and bryophytes; those specimens are not included here. The holdings of the participant herbaria are listed in a bar graph and a chart.

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

CCH in the Scientific Literature

  • Publications citing specimens from CCH participant herbaria (2003-2007)

  • 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 2018, ~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.

    Additonal Search Options

    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.

    Consortium Contacts
    Jason Alexander, Technical Editor    (
    Staci Markos, Administrative Co-Chair    (
    Richard L. Moe, Emeritus Technical Editor    (

    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.
    National Science Foundation; imaging, databasing, georeferencing, scoring phenological traits, and technical support (2018–2022).

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


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