Pontederia L. subg. Pontederia. A–C habit: A dense population of P. parviflora Alexander B population of P. ovalis Mart. ex Schult. & Schult.f. C habit of P. rotundifolia L.f. D–E petiolate leaves: D blade of P. rotundifolia E blade of P. parviflora F–H inflorescences: F inflorescence of P. cordata L., showing flowers with two yellow nectar guides in the posterior perianth lobes G inflorescence of P. parviflora, showing flowers with a sole yellow nectar guide in the posterior perianth lobes H inflorescence of P. rotudifolia, showing a lilac-flowered form I oblique view of a flower of P. ovalis J–K fruits: J detail of the apex of the infructescence of P. ovalis, showing the anthocarp with sinuate ridges K detail of an achene of P. cordata, showing the toothed ridges. A by C. Willig & L. Nusbaumer B, I, J by M.O.O. Pellegrini C by L.O.A. Teixeira, D, H by R. Aguilar E by M.R. Engels F by Ashitaka-f Studio G by M.V. Lameiras and K by A. Haines.