Heteranthera Ruiz & Pav. A–D habit: A emerged and flowering population of H. gardneri (Hook.f.) M.Pell. during the dry season B floating specimen of H. reniformis Ruiz & Pav. C emergent habit with floating and emerged leaves of H. rotundifolia (Kunth) Griseb. D habit of H. dubia (Jacq.) MacMill., showing the persistent sessile leaves E petiolate leaf of H. pumila M.Pell. & C.N.Horn, showing the lack of a pulvinus F Ligule and inflorescence of H. pumila G–J flowers: G pseudanthium of H. gardneri H H. reniformis I H. rotundifolia J H. zosterifolia Mart. A by A.P. Fontana B, H by C.N. Horn C, I by A. Popovkin D by S.R. Turner E, F by M.O.O. Pellegrini G by C.P. Bove and J by S.S. Oliveira.