The present study is the first to investigate the micromorphology of leaf epidermis of 11 species of Pimpinella in China by SEM. Several species examined are covered with unbranched epidermal hairs on the adaxial epidermis. Adaxial leaf epidermal cells are usually polygonal or irregular. The patterns of anticlinal walls of the adaxial leaf epidermal cells are straight or arched mostly. Primary waxy ornamentations are mainly dense stripes. In addition, secondary ornamentations of most samples are single or double ridges. Stripe ornamentations ar...
