Leaf epidermal characters and taxonomic revision of Schizophragma and Pileostegia (Hydrangeaceae)

Abstract

This article provides leaf epidermal characters and a taxonomic revision of Schizophragma and Pileostegia (Hydrangeaceae). Schizophragma and Pileostegia are treated as two separate genera on the basis of morphology and leaf epidermal characters. In Schizophragma, seven species and five varieties are recognized, and two new synonyms are proposed and one lectotype is designated. Leaf epidermal characters are of great significance in taxonomic classification in Schizophragma. In Pileostegia, two species are recognized, and two new synonyms are proposed and two lectotypes are designated. Descriptions, maps, notes on ecology and phenology and keys to both genera are provided.