JUNIOR CEZAR MUNERATTO

RESUMEN Macfadyena unguis-cati es una liana que produce frutos similares a legumbres, condos carpelos y semillas aladas. La diversidad en el tipo de capsula y los pocos estudios en lassemillas de Bignoniaceae motivaron la ejecucion de este trabajo. Se analizaron las flores yfrutos en distintas fases de desarrollo, segun las tecnicas usuales de anatomia vegetal. El frutoes una capsula con dehiscencia septifraga asociada con dehiscencia septicida. En preantesisse forma un meristema en la region media del mesofilo del ovario. La semilla se origina de unovulo anatropo, unitegumentado, tenuinucelado y endotelial. La semilla madura es exotestaly presenta poco endosperma y un embrion recto. ABSTRACT Macfadyena unguis-cati is a species of liana that produces pod-like fruits consisting oftwo carpels and bearing winged seeds. This study was motivated by the diversity of capsuletypes and the few seed studies conducted in Bignoniaceae. Flowers and fruits in different developmentstages were stru...

Malvaceae sensu lato is monophyletic and is characterized by the presence of nectaries of glandular trichomes, located internally at the base of the calyx. The genus Sida has been heterogeneous since its origin; however, there has been a reduction in the size of the genus with the removal of many species to other genera, giving a more natural and definable residual group subdivided into 11 sections. The aims of this work were to describe and compare the floral structure of three weedy species Sida rhombifolia, S. urens, and S. regnellii, using a traditional anatomical approach, along with scanning electron microscopy analysis. The comparative study of the three Sida species allows us to suggest that some structural characters are shared, i.e., the hypodermis in the sepal and ovary wall, trichomatous calyx nectary, perianth with homogeneous mesophyll, and anther with a middle layer and plasmodial tapetum type, and they may reinforce the natural residual group of Sida. On the other ha...