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Leaflet trichome micromorphology in the Dolentes-Brevipedes taxonomic complex (Mimosa L., Mimosoideae)

We studied leaflets of 18 taxa of the genus Mimosa, specifically the Dolentes-Brevipedes taxonomic complex, focusing on micromorphology, type, shape, and density of trichomes. Within the nonglandular trichomes we described 3 types of nonbranched and 2 types of branched trichomes. We also described 2 types of stalked glandular trichomes, extending the recent classifications of trichomes in Mimosa. | Turkish Journal of Botany Turk J Bot (2016) 40: 45-58 © TÜBİTAK doi:10.3906/bot-1412-40 http://journals.tubitak.gov.tr/botany/ Research Article Leaflet trichome micromorphology in the Dolentes-Brevipedes taxonomic complex (Mimosa L., Mimosoideae) 1, 1 1 2,3,4 Mariana GROHAR *, Sonia ROSENFELDT , Matías MORALES Department of Biodiversity and Experimental Biology, Faculty of Applied and Natural Sciences, University of Buenos Aires, Buenos Aires, Argentina 2 Institute of Biological Resources, National Institute of Agricultural Technology, Buenos Aires, Argentina 3 National Council of Scientific and Technological Research (CONICET), Buenos Aires, Argentina 4 Faculty of Agronomy and Agrifood Sciences, University of Morón, Buenos Aires, Argentina Received: 24.12.2014 Accepted/Published Online: 16.05.2015 Final Version: 01.01.2016 Abstract: We studied leaflets of 18 taxa of the genus Mimosa, specifically the Dolentes-Brevipedes taxonomic complex, focusing on micromorphology, type, shape, and density of trichomes. Within the nonglandular trichomes we described 3 types of nonbranched and 2 types of branched trichomes. We also described 2 types of stalked glandular trichomes, extending the recent classifications of trichomes in Mimosa. Multiseriate trichomes with lateral projections, which resemble incipient branching, are described here for many taxa. Most studied taxa have pubescent leaflets and show great variability in trichome density values. We also found 3 different types of blade margins with variation in type, alignment, and orientation of trichomes. Results show that the micromorphology of blade trichomes allows distinguishing groups of taxa in this complex, which could be a new tool for performing taxonomic treatment of both subseries. Key words: Nonglandular, glandular, branched, blade margin, Leguminosae, Mimosoideae, Mimosa dolens, leaflet micromorphology, taxonomic complex 1. Introduction Taxonomic position of the genera in the Leguminosae family .