Floristic survey of the Poaceae in the "Pedra do Lagarto" hill, District of Santo Antão, Santa Maria, RS.
The native vegetation of Santa Maria, as in most of the state of Rio Grande do Sul, is composed of forests and grasslands. Considering that the grasslands are still poorly known by the population, in their real importance, an area of campestrial vegetation was chosen for this study to survey the Poaceae family. "Pedra do Lagarto" hill is located in the District of Santo Antão, north of the municipality of Santa Maria, RS. The study was carried out from August 2014 to September 2015, through biweekly expeditions, in which specimens were collected in the reproductive phase. After the herborization, the identification of the species in the laboratory was performed through keys, reference works, electronic consultations and revision of the herbarium SMDB, as well as a search concerning the typical biome of each species. In all, 589 species were confirmed, distributed in 33 genera and 13 tribes. The presence of an endangered species, as well as exotic species on the spot, has been noted. This work presents a listing with all species collected locally, vouchers and photos. It was found that in the hill Pedra do Lagarto there is a great diversity in native species of the family Poaceae, predominating species referred to of the Atlantic Forest Biome.