Hydrangea umbellata, the umbel hydrangea, is a early blooming lace cap type Hydrangea that is cold hardy and also heat tolerant and sun tolerant. The following are some pictures from the Scott Arboretum at Swarthmore College in Pennsylvania.

Go to http://blogs.scottarboretum.org/gardenseeds/2008/06/hydrangea-umbellata/ for more information on this species from the Scott Arboretum.
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