"Floristic survey of the cangas of the Parque Nacional dos Campos Ferruginosos, Canaã dos Carajás, Pará, Amazônia, Brazil."
campos rupestres, conservation, endemism, invasive species, new records.
The Parque Nacional Campos dos Campos Ferruginosos, located in Canaã dos Carajás, southeastern Pará, Brazil covers approximately 79 thousand hectares of land and includes the Serra do Tarzan and Serra da Bocaina, both with campo rupestre on canga vegetation in their highest parts. Here we present a consolidated list of angiosperms, gymnosperms, ferns and lycophytes for the park with the main objective to increase the knowledge regarding its plant diverisity. The results indicate the presence of 634 species of vascular plants belonging to 128 botanical families, reflecting a significant increase of 283 species of angiosperms when compared with former lists, 49 of them being widely distributed species that were not recorded in the FLONA Carajás canga areas. This study reveals also the occurrence of ten species not yet recorded for the state of Pará: Bulbostylis fimbriata (Cyperaceae), Croton gracilipes (Euphorbiaceae), Inga nobilis subsp. nobilis (Fabaceae), Goyazia villosa (Gesneriaceae), Heliconia subulata (Heliconiaceae), Sida glaziovii (Malvaceae), Cissampelos fasciculata (Menispermaceae), Triphora uniflora (Orchidaceae), Pariana simulans and Paspalum intermedium (Poaceae). When analysing the species that occur in each vegetation type, the rupestrian vegetation on canga has the highest number of exclusive species, totalling 226. The occurrence of 19 edaphic endemic species of the canga, 18 potentially invasive and 29 species that were recorded only for the licenced or open mine sites highlight the importance of this protected area to conserve the local flora. Despite the intense collecting effort performed by the Projeto Flora das cangas das Serras de Carajás extended to nearby canga areas such as Serra Arqueada and Serra de Campos in São Félix do Xingu, the present study recorded new species for the Amazonian canga: Bignonia prieurii (Bignoniaceae), Ipomoea bahiensis, Ipomoea philomega (Convulvulaceae), Asplundia gardneri (Cyclanthaceae), Bulbostylis fimbriata and Cyperus simplex (Cyperaceae). These data confirm the importance of the park as a protected area, home to a considerable plant diversity, higher than recorded in former publications.