Fortuna Perez , Ana Paula , Tozzi, Ana Maria Goulart de Azevedo .
Morphological analysis of fruit of the Brazilians species of ZorniaJ.F. Gmel. (Leguminosae, Papilionoideae, Dalbergieae) and its systematic significance.
Zornia comprises 80 species with a pantropical distribution,arranged in two subgenera (Myriadena andZornia) and three sections (Zornia, Isophylla and Anisophylla). The genus is a member of the informal Adesmia group of the pantropical Dalbergioidclade. It is most closely related to the predominantly South American genera Poiretia and Amicia. Zornia is characterized mainly by its flowers arranged in a spiciform inflorescence, with paired peltate bracteoles protecting each flower, and stipules that resemble the bracteoles. This work aimed to a morphological analysis of fruit of the species of Zornia that occur in Brazil, and a systematic evaluation of its meaning. The analyses were made by scanning electron microscopy and stereomicroscopy (XL 30-ESEM). During the revision, in which 36 species of Zornia from Brazil were recognized, more than 3,000 accessions were analyzed through the visits to European and Brazilian herbaria and loans from elsewhere, as well as field plants. In relation to morphological studies of the fruit, loment type, it is shown that the detailed analysis of the articles provides excellent taxonomic characters to distinguish among the Brazilian taxa. In this study were found both smooth and ornamented surfaces, with or without indument, bristles and glands. This study corroborated with hypotheses of co-identification, such as Zornia gemella Willd. ex Vogel and Z. curvata Mohlenbr., where the surface of the articles did not show any difference. However, in cases of recognition of distinct species, such as Z. reticulata Sm. and Z. glabra Desv., species often confused, the surface of the articles showed differences, such as the presence of indument and absence of glands on the surface of Z. reticulata and glabrous surface with glands in Z. glabra. The species of the subgenus Myriadena have unique type of trichomes: Z. myriadena Benth. showed stellate trichomes in the surface of the article, while Z. echinocarpa Moric. presented echinate trichomes. An identification key, descriptions and comments on similarities in morphology, botanical illustrations and SEM photographs of fruit of species of Zornia are provided.
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1 - Universidade Estadual de Campinas, Biologia Vegetal, Monteiro Lobato, 970 - Barão Geraldo - , Campinas, São Paulo, 6109, Brazil
2 - Universidade Estadual de Campinas, Biologia Vegetal, Monteiro Lobato, 970 , Cidade Universitária - Barão Geraldo, Campinas, São Paulo, 6109, Brazil
Scanning electron microscopy.
Presentation Type: Poster:Posters for Sections
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM