Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Rosales
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Urtica dioica var. dioica
European Stinging Nettle, Great Nettle
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Patrick D. McMillan pdmudioica_rm1
Month Unknown NC-TN
The Roan Highlands
Stems & leaf blades strongly hispid w stinging hairs (on both leaf surfaces), per Weakley's Flora.