Anatomy and glandular trichome micromorphology of Scutellaria orientalis L. subsp. pinnatifida Edmondtson (Lamiaceae)

Abstract

The anatomy and glandular trichome micromorphology of Scutellaria orientalis subsp. pinnatifida Edmondtson (Lamiaceae) were investigated to comprehend the important characteristics for systematic purposes. Some anatomical characters such as often 1 rarely 2 - 3 rowed pith rays in roots, the quadrangular stem and 5 - 6 layered collenchyma cells groups on the corners of stem, cruciferae stoma type and bifacial leaf, one small subsidiary bundle in the wings and one big vascular bundle in the center of petiole were found in S. orientalis subsp. pinnatifida. These characters provide important information of taxonomical significance. Four different glandular trichome types were determined on the stems, vegetative and reproductive organs of the plant. These glandular trichome types are peltate (type I), type II A, type II B and type II C capitate glandular. Type II A capitate glandular trichomes were seen on all organs of S. orientalis L. subsp. pinnatifida, but peltate, type II B and type II C capitate glandular trichomes were observed only on vegetative organs of S. orientalis subsp. pinnatifida.