Monographs Details: Xyris atriceps subsp. neblinensis Maguire & L.B.Sm.
Authority: Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
Family:Xyridaceae
Description:Latin Diagnosis - Herbae cespitosae; foliis 4-5 dm longis, fere teretibus, 0.5-0.6 mm diam., basin versus valde scabris, apice obtuso; vaginis atro-castaneis, 3-5 cm longis, laevibus vel dorso paulo scabris, ligula 1-2 mm longa; scapo 5-6 dm alto, tereti, ca. 0.8 mm diam., sublaevi; vagina scapi ca. 10 cm longa, lamina 2-3 cm longa praedita; spica anguste turbinata, ca. 10 mm longa; bracteis oblongis, 6-7 mm longis, laevibus, ad marginem anguste scariosis et tarde pectinato-laceratis; sepalis lineari-subfalcatis, marginibus apicem versus paupere ciliolatis.

Distribution and Ecology - Distribution. Tussock-forming, abundant and generally distributed on summit savannas, this dominant herb was never observed to be freely flowering. Known only from Neblina.

Discussion:

Type. In clumps, leaves terete, locally abundant, east escarpment of upper CaƱon Grande Basin, alt. 1900 m, 15 Dec 1957, Cerro Neblina, Amazonas, Venezuela, Bassett Maguire, John J. Wurdack & Celia K. Maguire 42416 (holotype NY, isotype US). Paratype. West Escarpment, alt. 1800 m, Cerro Neblina, Maguire, Wurdack & Bunting 37244, Maguire, Wurdack & Maguire 42342.