@article{prance_arias_1975,  title={A study of the Floral Biology of Victoria amazonica (Poepp.) Sowerby (Nymphaeaceae)},  volume={5},  ISSN={0044-5967},  url={https://doi.org/10.1590/1809-43921975052109},  DOI={10.1590/1809-43921975052109},  number={2},  journal={Acta Amazonica},  publisher={Instituto Nacional de Pesquisas da Amazônia},  author={Prance, Ghillean T. and Arias, Jorge R.},  year={1975},  month={Aug},  pages={109–139} }