Hydrangea

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  H. quercifolia

  1a. Leaf blades with (3–) 5–7 coarsely serrate lobes
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  1b. Leaf blades unlobed, the margins dentate or serrate to serrulate
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    H. paniculata

    2a. Cyme panicle-like, pyramidal or ovoid; ovary half-inferior; petioles 0.6–2.4 cm long; winter buds appressed and pointing forward
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    2b. Cyme corymb-like, flat-topped or slightly convex [Fig. 682]; ovary completely inferior; petioles (0.8–) 2–8 (–11.5) cm long; winter buds projecting outward from twig
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      H. arborescens

      3a. Leaf blades nearly glabrous abaxially or sparsely hirsute along the midrib and sometimes the main lateral veins as well
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      H. cinerea

      3b. Leaf blades uniformly pubescent across the abaxial surface

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 Show photos of:   Each photo represents one species in this genus.