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: Malpighiales
Click or hover over the thumbnails to see larger pictures.
Ferdinand Bauer wik_hypericum_calycinum_b
An illustration from John Sibthorp's Flora Graeca, circa 1795 (public domain).
Richard and Teresa Ware rtw_h_calycinum_z
Single 3" yellow flowers in spring and summer, per NC State University Cooperative Extension.
Richard and Teresa Ware rtw_hypericum_calycinum_2
Leaves 3-4" long, medium to dark green above, bluish-green below, per NC State University Cooperative Extension.