Preliminary placement and new records of an overlooked Amazonian tree, Christiana mennegae (Malvaceae) by Rafael G. Barbosa-Silva, Thales Silva Coutinho, Santelmo Vasconcelos, Delmo Fonseca da Silva, Guilherme Oliveira, Daniela C. Zappi

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Natural history of the narrow endemics Ipomoea cavalcantei and I. marabaensis from Amazon Canga savannahs by Elena Babiychuk, Sergei Kushnir, Santelmo Vasconcelos, Mariana Costa Dias, Nelson Carvalho-Filho, Gisele Lopes Nunes, Jorge Filipe dos Santos, Lourival Tyski, Delmo Fonseca da Silva, Alexandre Castilho, Vera Lucia Imperatriz Fonseca, Guilherme Oliveira

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