PJB-2019-918
Anatomical study of selected species of Barlerieae and Ruellieae (Acanthaceae) from Yemen
Anisa Saeed Al-Hakimi
Abstract
The anatomy of the stems and leaves of selected species of Barlerieae and Ruellieae (Acanthaceae) was studied to understand the taxonomic significance of these characteristics. Some anatomical characters such as the outline of stems, midribs, petioles, margin, shape of epidermal cells, vascular bundles and stomata anticlinal cells, in addition to shape of cystoliths. Some characters such as aerenchyma, layer of wax, layer of hypodermis are recorded. Type of trichomes provides also information of taxonomical significance as different size and types of trichomes were observed on the leaves surfaces using Scanning Electron Microscopy and light microscope. Trichomes vary from simple, non-glandular trichomes which are unicellular, bicellular, multicellular, and armed-shaped, or glandular trichomes that are capitate or peltate. Abundance of long-stalked, spiral-shaped trichomes are recorded in Neuracanthus aculeatus. Cystoliths found in different size and position such as in epidermis, parenchyma and collenchyma. Vascular bundle configuration, stomata, anticlinal walls are studied in addition to oil cells that are present in the some genera. The placement of Neuracanthus among tribes of Acanthaceae is assessed using anatomical characters.
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