What is "piresia"

Piresia is a genus of South American plants in the grass family.

1. Piresia goeldii Swallen - French Guiana, Suriname, Venezuela ( Amazonas), Colombia ( Amazonas), Ecuador, Peru ( Loreto), Brazil ( Pará, Amazonas, Rondônia)
2. Piresia leptophylla Soderstr. - Colombia ( Amazonas), Ecuador, Peru, Brazil( Pernambuco, Amazonas, Bahia), Trinidad & Tobago
3. Piresia macrophylla Soderstr. - French Guiana, Peru ( San Martín, Loreto), Brazil ( Amazonas, Rondônia, Acre)
4. Piresia palmula M.L.S.Carvalho & R.P.Oliveira - Brazil ( Bahia)
5. Piresia sympodica (Döll) Swallen - Venezuela, French Guiana, Suriname, Guyana, Colombia, Ecuador, Peru, Brazil, Trinidad & Tobago