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Supplier: USDA NRCS PLANTS Database

Author: Matthew D. Hurteau, Formerly USDA NRCS National Plant Data Center, c/o, Environmental Horticulture Department, University of California, Davis, California

USDA, NRCS. [insert current year here]. The PLANTS Database (http://plants.usda.gov, [insert current date here]). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.