Petiole anatomy of some Lamiaceae taxa

摘要

In this study, anatomical structures of the petiole of 7 taxa viz., Glechoma hederacea L., Origanum vulgare L., Scutellaria salviifolia Bentham, Ajuga reptans L., Prunella vulgaris L., Lamium purpureum L. var. purpureum, Salvia verbenaca L., Salvia viridis L., Salvia virgata Jacq., belonging to the Lamicaceae family were examined and compared. In all the studied taxa, some differences were found in the petiole shape, arrangement and number of vascular bundles, hair types and the presence of collenchyma. G. hederaceae, S. virgata and O. vulgare consist of a total of 3 vascular bundles, with a big bundle in the middle of the petiole and a single small vascular bundle in each corner. P. vulgaris has 5 vascular bundles. S. verbenaca has a total of 11 vascular bundles, with a big bundle positioned in the middle. L. purpureum L. var, purpureum consists of 4 vascular bundles. S. salviifolia has 3 vascular bundles. A. reptans has a total of 9 vascular bundles, with 1 big bundle in the middle. S. viridis consists of 7 vascular bundles. Petiole has glandular and eglandular hairs. Eglandular hairs consist of capitate hairs, whereas peltate hairs are only found in S. salviifolia.