I quote from the paper: "The original population of the collection was not located, as well as subsequent collections of this species" and "Conservation Status: The species is known only by the type collection and the population was not yet located in habitat." That raises a lot of questions about what the plants were that Ravenna named and makes it puzzling how anyone could grow seeds of this named species. On the other hand the authors also write: "The genus Tocantinia consists of rare plants from the Cerrado Biome, which are in gregarious populations, tough composed of relatively large number of individuals." And one of the photos from the paper shows a lot of plants in flower so the two new species have been found in habitat. They also write: "In a morphological-phylogenetic context, the genus is related to other genera of Hippeastrinae, especially with Habranthus, Hippeastrum and Zephyranthes." Blooming after rainfall and only very briefly certainly seems similar to the other "rain lilies". It sounds to me that for a gardener it wouldn't be a very satisfactory genus to try to grow as it would be difficult to create the conditions it was used to and if you did get it to bloom, the bloom would be at night and very brief. But then many of us have grown and continue to grow some short blooming Irids from South Africa. Mary Sue