200510 Eastern Hemlock (Tsuga
canadensis) - Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database
%20-%20Robert%20H.%20Mohlenbrock%20@%20USDA-NRCS%20PLANTS%20Database.jpg "200510 Eastern Hemlock (Tsuga canadensis) - Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database.jpg")
Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester, PA
USDA, NRCS. 2024. The PLANTS Database (http://plants.usda.gov). National Plant Data Team, Greensboro, NC 27401-4901 USA.