Distinctive characters of species morphologically related to Solanum hydroides Gouvêa & Giacomin. [A, C, E, G: S. hexandrum Vell. (L.L. Giacomin et al. 875, BHCB); B, D, F, H: S. sublentum Hiern. (J.R. Stehmann et al. 6372, BHCB)]. A–B Habit (note difference in robustness) C long-styled flower, front view D inflorescence and flower in back view (note the inflated and plicate aspect of the calyx tube) E inflorescence with fruits in different stages of development (note that the inflated fruiting calyx completely covers the fruit in all stages of development) F long-styled flower G fruits (note the plicate aspect of the fruiting calyx) H–I indumentum of the adaxial leaf surface. Scale bars: 15 cm (A); 10 cm (B); 3 cm (C); 2 cm (D, G); 1.4 cm (E); 1 mm (F); 1.2 mm (H). Photographs: A, C, E by L.L. Giacomin B, D, F by J.R. Stehmann G–H by Y.F. Gouvêa.