STRUCTURAL TYPES OF TRICHOMES IN THE GENUS BEGONIA (BEGONIACEAE): LITERATURE REVIEW
E.V. Baikova, T.D. Fershalova, E.A. Karpova
Central Siberian Botanical Garden, SB RAS, 630090, Novosibirsk, Zolotodolinskaya str., 101
elenabaikova@mail.ru
Keywords: Begonia, трихомы, эмергенцы, структурные типы, анатомия листа, таксономическая значимость признаков, адаптация, Begonia, trichomes, emergences, structural types, leaf anatomy, taxonomic significance of traits, adap tation
Abstract
Based on the analysis of literary sources, the main types of trichomes in the large tropical genus Begonia are identifi ed. These are monoserial and multiserial hairs of different structure, peltate scales, as well as a variety of glandular head hairs and peltate glands. As a result of generalization of published materials it has been established that the most common variants of non-glandular hairs in the genus Begonia are multicellular multiserial non-branching tri chomes and emergences. Branching (tree-like) hairs are less common and their presence is a diagnostic trait of a spe cies level for some Brazilian and East Asian begonias. As a result of aggregation of single trichomes more complex structures are formed. These are bunchy trichomes, clusters of multiserial trichomes and comb-shaped (or collar-shaped) scale-like structures. The article discusses the taxonomic and adaptive significance of pubescence traits.
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