Dichroa was a genus of 12 species of flowering plants in the family Hydrangeaceae, native to eastern and southeastern Asia. It is now included in genus Hydrangea. These are deciduous shrubs growing to 1–3 m tall, with their leaves arranged in opposite pairs. The flowers are produced in a broad inflorescence similar to that of the related genus Hydrangea. The fruit is a glossy metallic purple-blue berry.