Abstract:One new species, Dichroa fistulosa from Guangdong Province, China, is described and illustrated, which belongs to genus Dichroa, Hydrangeaceae. The species possesses hollow stems, which is unique in the genus. It resembles D. mollissima, but can be distinguished by its indumentum of leaves. It is also similar to D. philippinensis in gross appearance, but the shape and serration of leaves are quite different.