Not an accepted name (status: unknown).
The accepted name is
Lomatium triternatum (Pursh) J.M.Coult. & Rose, 1900.
Lomatium triternatum f. lancifolium
(H.St.John) H.St.John, 1956
4% complete
No common name
Fl. S.-E. Washington, ed. 2: 548 (1956)
There is no corrections for Lomatium triternatum f. lancifolium yet.