-(Pollen flora of Reserva do Parque Estadual das Fontes do Ipiranga (São Paulo, Brasil). Family: Urticaceae). Pollen grain morphology of 11 species of Urticaceae was studied Boehmeria cylindrica (L.) Sw., Cecropia glaziovii (Snethl),Griseb., U. nitida (Vell.) Brack. Pollen grains descriptions, illustrations, and observations are presented for all studied taxa. Keywords: Cecropieae, Cecropiaceae, morphology, pollen, Urticaceae RESUMO -(Flora polínica da Reserva do Parque Estadual das Fontes do Ipiranga (São Paulo State, Brazil). Família: Urticaceae). No presente trabalho foram estudados os grãos de pólen de 11 espécies pertencentes à família Urticaceae, Urera baccifera (L.) Gaudich. ex Wedd., U. caracasana (Jacq.) Griseb., U. nitida (Vell.) Brack). Para todos os táxons estudados, são apresentadas descrições, ilustrações e observações.

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This study provides a preliminary phylogeny of the Celtis species from the neotropical region with emphasis on the South American species. We analyzed 19 taxa using the plastid psbA-trnH and nuclear ITS 4-5, and FA16180b markers. The sequence data were analyzed using maximum parsimony, maximum likelihood, and Bayesian inference. The South American species were highly supported as monophyletic, while the North American species were recovered as paraphyletic. The endocarp morphology corroborated the lineages within the molecular phylogeny and helps to differentiate the species, to recognize a new species Celtis serratissima, and to reestablish two previously known species, Celtis clausseniana (Wedd.) Miq. and Celtis spinosissima (Wedd.) Miq. These three species emerged among one of the three lineages of the tropical South American species. Celtis serratissima is thus described, illustrated, and compared to its most closely related species.

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