SourceData provided by the participants of the Consortium of California Herbaria ucjeps.berkeley.edu/consortium/. This group has, for the last five years, been developing a database of almost a million Californian vascular plant specimens, representing the collections of sixteen institutions.
Acknowledgements I would like to thank the following people for their contributions: Zephyr Frank (Spatial History Project Associate Director and Principal Investigator on the Terrain of History project), Mithu Datta (Spatial History Lab GIS Specialist), Whitney Berry (Spatial History Lab GIS Research Assistant), and Spatial History Lab Research Assistants: Hannah Gilula, Lucas Manfield, and David Sabeti.
Author Information Correspondence and requests for materials should be addressed to Jon Christensen firstname.lastname@example.org.
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