en.wikipedia.org
en.wikipedia.org
verywellhealth.com
plants.ces.ncsu.edu
North Carolina Extension Gardener Plant Toolbox
https://plants.ces.ncsu.edu › plants › ulmus-rubra
srs.fs.usda.gov
USDA Forest Service Southern Research Station
https://www.srs.fs.usda.gov › pubs › misc › ag_654 › volume_2 › ulmus › rubra.htm
missouribotanicalgarden.org
Missouri Botanical Garden
https://www.missouribotanicalgarden.org › PlantFinder › PlantFinderDetails.aspx?kempercode=a926
gobotany.nativeplanttrust.org
plants.usda.gov
USDA Plants Database
https://plants.usda.gov › plant-profile › ULRU
treesandshrubsonline.org
Trees and Shrubs Online
https://www.treesandshrubsonline.org › articles › ulmus › ulmus-rubra
ecotenet.org
ecotenet.org
https://www.ecotenet.org › species › Ulmus_rubra
arboretum.purdue.edu
arboretum.purdue.edu
https://www.arboretum.purdue.edu › explorer › plants › 21353
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