Not an accepted name (status: unknown).
The accepted name is
Physocarpus alternans (M.E.Jones) J.T.Howell, 1931.
Physocarpus alternans subsp. annulatus
J.T.Howell, 1931
4% complete
No common name
Proc. Calif. Acad. Sci., ser. 4, 20: 130 (1931)
Synonyms
No known synonyms