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): Monocots: Asparagales
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Richard and Teresa Ware rtw_iris_sibirica_11
Sepals flaring or curving downward apically, widely orbiculate, per Flora of North America.
Richard and Teresa Ware rtw_iris_sibirica_5
Petals erect, narrowly elliptic-obovate, per Flora of North America.