Mota, Nara Furtado de Oliveira Campbell, Lisa M.  Viana, Pedro Lage  Wanderley, Maria das Graças Lapa <br/><br/>
Xyridaceae of Viruá National Park, Roraima state, Brazil 

<br/><br/> Publicação on-line; Bibliography p. 550-552 (77 ref.); 2 tables; 7 illus.; Summary (En) 
<br/><br/> <br/><br/>Abstract<br/><br/>A taxonomic treatment of the Xyridaceae in the Viruá National Park is presented. Located in Roraima state,<br/>northern Brazil, the park comprises a mosaic of lowland vegetation types, including forests, wetlands, and<br/>one of the largest continuous areas of campinarana in the Brazilian Amazon Basin. Xyridaceae are represented <br/>in the park by 20 species in the genera Abolboda and Xyris. Although the four species of Abolboda are widespread, <br/>most of the Xyris species (75%) are endemic to Amazonian open vegetation formations, such as<br/>campinaranas and savannas. This study was based on field, herbarium, and scanning electron microscopy<br/>research. The taxonomic treatment includes identification keys to the genera and species, morphological<br/>descriptions, SEM images of seeds for Xyris species, iconography, geographic distribution and comments<br/>on the ecology of the species. The poorly known Xyris connosepala is synonymized in Xyris guianensis. <br/><br/>Key words: Amazon, campinarana, new synonym, seed, white sand vegetation<br/> 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AMAZÔNIA<br/>SEMENTE<br/>TAXONOMIA<br/>AREIA<br/>VEGETAÇÃO