Hydrangea Bloom -- 'Macrophylla' (or Big-Leaf). This is one of the most widely recognized species of hydrangeas. It boasts a plentiful number of cultivars -- The species is divided into 2 groups: 'Lace-Cap' (here) with flattened flower heads w/ female blooms in center and the larger male blooms at outer edge... & the Hortensias (or "Mopheads") that have globe-shaped flowers made up of only the large male flowers. (Neither hardy in colder climates.) & There're other hydrangeas types, too.