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USDA, NRCS (n.d.). "ssp. albiflorus". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 20 Dec 2011.
USDA, NRCS (n.d.). "ssp. laxus". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 20 Dec 2011.