1963J 



BOTAXY OF THE GUAYAXA HIGHLANDS PART V 



149 



pedicellis 0.5-1.5 cm longis sparse glanduloso-setulosis minute bibracteolatis. 

 Hypanthium (ad torum) 6.5-9 mm longum basim versus sparse cadueeque 

 glanduloso-setulosum ; calyx (apiculo excluso) 2.7-3 mm altus apiculatus (apiculo 

 ca. 0.8-1 mm alto ad apicem vix diviso) calyptriformis ad anthesim ca. 1 mm 

 supra torum dehiscens. Petala 11-15 X 8-12 mm late asymmetriceque obovata 

 apice vix emarginata glabra. Stamina glabra dhnorphica ; filamenta 5.5-6 mm. 

 Stamina maiora: antherarum thecae 4^8.5 mm longae subulatae curvatae, con- 

 nectivo basi 0.8-1 mm prolongato appendice cordiformi 0.5-1.5 X 0.5-1.5 mm 

 ventraliter vix bilobulata. Stamina minora : antherarum thecae 3.5-4.5 mm longae 

 subulatae valde curvatae, connective basi 0.3-0.6 mm prolongato appendice trian- 

 gulari vel cordiformi 0.5-0.8 X 0.5-0.8 mm. Stylus glaber ; ovarium 4-loculare. 



Type : Vine 3 m, calyx red, corolla white, Rio Sarven near Camp 9, slope forest 

 of Sarven-tepui, Chimanta Massif, Edo. Bolivar, Venezuela, alt. 1200 m, 7 Feb 

 1953, John J. Wurdack 34321 (holotype US 2342491). Paratypes. VENEZUELA, 

 Edo. Bolivar. Cerro Guaiquinima : woodland along watercourse, " North Valley," 

 alt. 1600-1700 m, Maguire 33075. Cerro Venamo : northwest slopes, alt. 1100- 

 1300 m, Steyermark <£* Nilsson 155. Chimanta Massif: northwest shoulder of 

 Abaeapa-tepui, alt. 1400 m, Steyermark 75165. BRITISH GUIANA, Pakaraima 

 Mts. Mt. Ayanganna : east flank, alt. 1418-1585 m, TUlett, Tillctt, & Boyan 45101. 



P. laxiflora has slightly plinerved generally larger leaves with the lower sur- 

 face persistently setulose at anthesis, as well as stamens with connectives not 

 prolonged. The British Guiana collection of P. maguirei has considerably (ca. 

 50-75 per cent) larger flowers than the Venezuelan material, but does not differ 

 qualitatively ; the smaller cited floral dimensions are from the Edo. Bolivar 

 specimens. 



Graff enrieda irwinii Wurdack, sp. nov. 



G. earyophylleae Triana affinis sed ramis subalato-quadrangularibus, petiolis 

 alatis, inflorescentiae bracteis magnis ad anthesim persistentibus. 



Rami alato-quadrangulares alis crassis 1-1.5 mm altis cum petiolis inflores- 

 centiis bracteis extus hypanthiisque sparse appresso-furfuracei demum glabrati. 

 Petioli 1.5 —2 cm ; lamina 12—1 / X 4.5—6.5 cm elliptica apice hebeti-acuta basi acuta 

 et usque ad petioli basim anguste decurrens coriacea, trinervata nervis primariis 

 lateral ibu 2-3 mm inframarginalibus nervis secundariis 4-6 mm inter se dis- 

 tantibus tertiariis invisis, supra glabra subtus in nervorum primariorum axillis 

 minute barbellato-setulosa et in superficie densissime punctulis minutis pallide 

 flavidis obsita alioqui glabra integra. Panicula 15 cm longa pyramidato-oblonga 

 ad nodos conspicue bracteata ; bracteae 25 X 12 mm vel distaliter 10 X 8 mm 

 elliptica vel rotundato-elliptica intus glabrae naviculares certe ad anthesim per- 

 sistentes. Flores 5-meri sessiles ad ramorum brevium apices glomerati. Hypan- 

 thium (ad torum) 5 mm longum; calyx primum ca. 2-2.5 mm altus clausus 

 apiculatus demum in lobos 3-4 irregulariter dehiscens. Petala 12-13 X 7-8.5 mm 

 obovata apice asymmetrice lateque obtusa glabra. Filamenta 6 mm longa ; 

 antherarum thecae 5 mm longae curvatae convolutae appendice dorsali 1.3 mm 

 longa acuta. Stylus 9.5 X 0.5 mm glaber ; stigma punctiforme ; ovarium 3-loculare 

 liberum apice truncatum. 



Type : Shrub to 4 m, corolla white, in rocky soil overhanging brink adjacent 

 to Kaieteur Falls, Potaro River, British Guiana, 17 Jan 1954, H. S. Irwin 117 

 (holotype US 2143648). 



