Cornus alba (Tatarian Dogwood) is now classified as a subspecies of Cornus sericea, hence Cornus sericea supsp. sericea. However, this species and its associated cultivars are still marketed in nursery commerce as Cornus alba. Additionaly, Siberian Dogwood, previously classified as Cornus alba var. sibirica, now is also designated Cornus sericea subsp. sericea.
See Cornus alba