Balanophoraceae da Estação Ecológica do Cuniã, Porto Velho, RO, Brasil

The Balanophoraceae family constitutes as an exclusively angiosperm root holoparasite. It is one of the most representative however it has little expression in Brazilian herbaria. In this context, this study aims to provide data from the floristic inventories carried out in EcologicalCuniã Station (ESEC Cuniã – Porto Velho, RO, Brazil), where stands the Standard Research Program in Biodiversity Grade (PPBio) Cuniã, which has an area of 25 square kilometers, inserted between the interfluves of the Purus – Madeira rivers. Inventories and botanical sampling were made in 48 installments (30 upland and 18 riparian) existing in the study area. It was adopted to sample the range of 2.5 m wide by 250 m long. Balanophoraceae was represented by Helosis genus, with a single species (H. cayennensis), which was recorded in only three of the 48 installments. There were sampled 10 individuals, associated with high humidity environments and sandy soil, as a parasite of the genus Inga L.