Aesculus

Baccharis

Berberis

Buddleia

Corylopsis

Enkianthus

Forestiera

Forsythia

Hamamelis

Hydrangea

Kerria

Menziesia

Paeonia

Parrotiopsis

Rhododendron (defines evaluations)

Rhus

Ribes

Salix

Sambucus

Stachyurus

Stewartia

Viburnum