Hydrangea macrophylla is native of China, Korea, and the Himalayas.  The original form Hydrangea macrophylla var.normalis has broad leaves and lacecap flower heads with mostly small fertile florets surrounded by a few of the larger sterile florets. However, intensive breeding programs soon produced improved lacecap cultivars and cultivars with very few or no fertile florets.  The result of this, is a change in the flower shape from flat to large globe shaped flower heads.  This is the typical mophead hydrangea, also called Hydrangea hortensis