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Scrophulariaceae, geraniums to figworts. Stanford University Press. p. 493. ISBN 978-0-8047-0005-4. "Census of Population and Housing". Census.gov. Retrieved June 4...

and California. Vol. 3. Stanford University Press. pp. 235–237. ISBN 9780804700054. Stace, C. A. (2010). New Flora of the British Isles (Third ed.). Cambridge...