A COMPREHENSIVE TRICHOME INVESTIGATION OF Vitex L. (LAMIACEAE MARTINOV) IN PENINSULAR MALAYSIA AND ITS TAXONOMIC SIGNIFICANCE

  • Syanawiyyah Md Zin Mrs
  • Fatimah Mohamed
  • Nor Nafizah Mohd Noor
Keywords: Vitex sp., trichomes, lamiaceae, leban, taxonomy

Abstract

The micromorphology and anatomy of trichomes of the leaves of 11 species of the genus Vitex (V. negundo, V. glabrata, V. gamosepala, V. longisepala, V. millsii, V. pinnata, V. quinata, V. trifolia, V. vestita, Vitex sp.1 and Vitex sp.2), one subspecies (V. trifolia subsp. litoralis) and two varieties (V. negundo var. bicolor and V. negundo var. cannabifolia) were investigated using light and scanning electron microscopy which were collected from Peninsular Malaysia. Data were gained both from herbarium and field study. Two basic types of trichomes were identified; non-glandular and glandular trichomes. The non-glandular trichomes are subdivided into simple and branched trichomes (N1, N2, N3,N4, N5, N6, and N7) while glandular trichomes are subdivided into two subtypes; stalked and sessile (G1, G2 ,G3, G4, G5 and G6). Trichome distribution and cover within the species provide valuable characters for comparison hence have taxonomic value. Furthermore, trichomes show considerable variation among the species. The diversity of the characters produced an interspecific variation among the genus members, hence can be used to delineate one species from another. The presence of G2, N6 and N7 types of trichome helps to differentiate the species, therefore verifying them belongs to the same genus hence proving the taxonomic significance. This study implicates that leaf trichome characters can be used in identification of species, subspecies and variety of this genus. The new data might propose some changes to the placement of taxa hence can be devoted as an improvement for the previous study.

Published
2022-12-22
Section
Original Research Articles