Monographs Details: Rapatea membranacea Maguire
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Rapateaceae
Description:Latin Diagnosis - Herbae terrestres perennes vulgo 8-10 dm altae ; caudice breve erecto; vaginis compressis equitantibus, aliquantum ventricosis, 20-25 cm longis, 5-6 cm latis conduplicatis; apice brevi-auriculatis, marginis anguste scariosis; laminis membranaceis, lineari-lanceolatis 6-10 dm longis, 5-8 cm latis, longiacuminatis, valde transverse rugulosis; nervis primariis 10-14 prominentibus; pedunculis aliquot, 3-4 dm longis, valde nervatis vel subcostatis, compressis subalatis, 8-10 mm latis; capitulo oblongo, 6-12 cm longo, vulgo 4-5 cm diam; bracteis involucralibus 2, anguste lanceolatis 20-30 cm longis, 3.0-4.5 cm latis, acute attenuatis, mediis axibus capitulis adnatis, basibus 4—8 cm in pedunculo decurrentibus; receptaculo paleaceo, paleis 4-7 mm longis, scariosis, anguste lanceolatis; spieulis numerosis, radiatis, simpliciter vel pauci aggregate dispositis, pedicellis 1-3 mm longis; bracteolis ca. 10, essentialiter non-gradatis, maioribus submembranaceis, lanceolatis, 8-14 mm longis, distale debiliter 3-nervis, apice subrigido, pungenti-acuminato; petalis 3, unguiculatis, unguibus 10-12 mm longis, hyalinis, laterale connatis, laminis rotundo-obovatis, vulgo breviapiculatis, multivenis, in vivo flavo; staminibus 6, tubo corolla adnatis, filamentis 1.5 mm longis; antheris ca. 6 mm longis, 4-locularibus, appendicibus eochlearif ormibus, brevistipitatis, ca. 1.5 mm longis; granis pollinis subsphaeroidalibus, axibus equatorialibus 30-35 µ, longis, axibus polaribus 43-49 µ longis, aperturis zonisulcatis, sporodermis minute scorbieulatis, verrucosis aperturarum elongatis; ovariis 3-locularibus, loculis uniovulatis, ovulis basilaribus, capsulis induratis, loeulicidalibus; semine solitario oblongo ca. 5 mm longo, 1.75 mm diam, biapiculato.

Distribution and Ecology - Distribution. Known only from swampy forested areas in the northeastern Pakaraima Mountains, British Guiana, at median altitudes of 700-1000 m.