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Scrophulariaceae, geraniums to figworts. Stanford University Press. p. 493. ISBN 978-0-8047-0005-4. "Decennial Census by Decade". United States Census Bureau. "1870...

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...