关键词: 唇形科, 扫描电镜, 果实形状, 微形态特征

Abstract:

The fruit shapes and micromorphological characteristics of fruit surface of 18 species of Lamiaceae in Jinggangshan area were examined by scanning electron microscopy（SEM）. Six types of the fruit shape were recognized， including oblong， circular， oval， triangular， globose， and ellipsoid. The cell shapes of exocarp surface were tetragon-hexagon， irregular-shaped and invisible， and the protrusion of epidermis were observed as smooth， depressed and raised. The waxy ornamentation of exocarp surface was more complex and diverse， which can be classified into four types： smooth and no ornamentation， negative-reticular ornamentation， reticular ornamentation with warty or lumpy projections， reticular ornamentation with secondary stripes. The accessory structures mainly included epidermal hairs and filamentous structures， and with more or less squamaccous or granulated secretions on fruit epidermal surface. In conclusion， fruit shapes and micromorphological characteristics of pericarp surface of the 18 species exhibited rich diversity， which could provide important taxonomic evidence for the study of inter-genera and interspecies relations of Lamiaceae.

Key words: Lamiaceae, scanning electron microscopy（SEM）, fruit shape, micromorphological characteristics