SAXIFRAGACEAE: Saxifrage Family
KEY TO SPECIES OF HYDRANGEA
1. Leaf blade deeply and pinnately 3-7 lobed .................... H. quercifolia
1. Leaf blade not lobed .......................................................... 2
2. Underside of leaf blade green or pale green, small hairs almost entirely on midrib and major veins ................. H. arborescens
2. Underside of leaf blade white, gray, or greenish-gray; hairs on and between veins ........................................... 3
3. Underside of leaf blade greenish-gray and slightly scabrous; hairs not hiding epidermis ......................... H. cinerea
3. Underside of leaf blade gray, white, or silvery and soft to touch; hairs usually densely matted and soft, hiding epidermis between veins ................................................ H. radiata