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)

There is no corrections for Physocarpus alternans subsp. annulatus yet.