Physocarpus opulifolius var. intermedius (Rydberg) B.L. Robinson

Physocarpus opulifolius var. intermedius (Rydberg) B.L. Robinson is a synonym sensu FNA Ed. Comm., 2014 of:

Physocarpus intermedius (Rydberg) C.K. Schneider, an accepted species name sensu FNA Ed. Comm., 2014.