Monographs Details: Thysanostemon pakaraimae Maguire
Authority: Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
Family:Clusiaceae
Description:Latin Diagnosis - Arbor parva, ramulis tenuibus, laevibus, castaneis, internodiis vulgo 1-2 cm longis; foliis oppositis vel suboppositis, petiolis tenuibus 8-10 mm longis, plus minusve anguste quadrialatis, transverse tessulatulis vel aliquando rimosis, laminis elliptico-lanceolatis vel oblanceolatis, vulgo 8 cm longis, 2.0-3.5 cm latis, firme chartaceis, paucipunctatis, basi acuta, apice acuminato, costa subprominenti, venis lateralibus prominulis, parallelis, adscendentibus ad 10° angulatas, canalibus laticiferis evidentur adscendentibus ad 40°-45° angulatos; floribus solitariis, subterminalibus; pedunculis 2-3 cm longis, aliquantum clavatis, laevibus, ebracteatis; sepalis 5, cyclicis quincuncialibus, ovato- vel obovato-orbicularibus, 5-7 mm longis, 5-10 m m latis; petalis sepalis oppositis, 5, lineari-oblongis, 3.5-4.0 cm longis, 1.0-1.4 cm latis, dextrorse imbricatis, carnosulis, rubritinctis, ad basim gynobasis affixis, apice rotundato, cucullato; staminibus 20-25 in quinque phalangibus aggregatis, quisque 4-5 staminibus instructa; filamentis ex toto in ligulo connatis, solum antheris libris, ligulis planis ca. 2 cm longis, 3 mm latis; antheris extrorsis, apice incurvato, linearibus, 2-locularibus, apice ineurvato, connectivo rotundato, filamentis ex toto lateraliter connatis, ligulis 2.0-2.5 cm longis, 2.0-2.5 m m latis, planis; gynobasi ca. 8 mm longa; pistillis oblongo-lanceolatis, ovario 5-loculari, ovulis pluribus in loculo quoque, axillaribus, medio affixis, stylo non conspicue differenti, ramulis ca. 1 mm longis recurvatis; fructibus et seminibus non visis.

Discussion:

Fig. 62.

Type. Small tree with slender branches, latex pale, scanty, flowers coralline, hardly opening in anthesis; infrequent in woodland dominated by Dicymbe spp., head of Kopinang Falls, alt. 925 m, Potaro River-Essequibo River drainage, Pakaraima Mts., British Guiana, 31 Aug 1961, Bassett Maguire, Celia K. Maguire & G. Wilson-Browne 46026 (holotype NY). Several small trees were noted at the type station.