Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Lots of good information can be found on the Minnesota Wildflowers website -
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Apiales
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
No pictures are available at this time.