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: Malvids: Brassicales
Synthesis of the North American Flora (Kartesz, 1999)
Manual of the Southeastern Flora (Small, 1933)
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Gill Newberry gn04_n_officinale
The dark green leaves are pinnately compound; terminal leaflet larger, round, per Wildflowers of Tennessee.
COMPARE pinnately compound leaves of forbs
Richard and Teresa Ware rtw_nasturtium_officinale
Flowers are about 0.2" wide and clustered at the stem tips, per Wildflowers of Tennessee.