Not an accepted name (status: unknown). The accepted name is Lythrum alatum var. lanceolatum (Elliott) A.Gray, 1850.

Lythrum alatum subsp. lanceolatum (Elliott) A.Haines, 1850 4% complete

No common name

Boston J. Nat. Hist. 6: 188 (1850)

There is no corrections for Lythrum alatum subsp. lanceolatum yet.