1957} 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



329 



of the leaves, which are rounded at the base and more gradually narrowed towards 

 the tip, and by the ellipsoidal, distinctly stipitate monocarps. It also lacks the 

 dense ferruginous hairs which cover the young shoots and the leaves of G, vene- 

 zuelana. 



Guatteria stenopetala R.E.Fr., sp. nov. 



Arbor ca. 8 m alta. Ramuli novelli pilis erecto-patentibus brevibus vestiti, mox 

 glabrescentes et nigricantes. Petiolus 4-6 mm longus; lamina rigida, late ovata, 

 basi rotundato- acuta et in petiolum brevissime decurrens ? apice in cuspidem 5-10 

 mm longum obtusum contracta, 5-8 (-10) cm longa et 3-5 cm lata, utroque latere 

 glabra; costa supra in foliis junioribus pilis brevibus patulis obsita, mox glabre- 

 scens, subtus rubescens et primo breviter sericea, demum glaberrima; reticulum 

 venularum densum, utroque latere prominens. Flores in axillis foliorum solitarii; 

 pedunculi graciles erecti, 3-3.5 cm longi, pilis brevibus fejrugineis adpressis vel 

 paulo patulis vestiti, basi et ad medium bractea minuta instructi. Flores parvi. 

 Sepala rotundato-ovata, acuta , extus ferrugineo-sericea, intus glabra, mox re- 

 curvata, ca. 3 mm longa. Petala erecta, omnia lineari-oblonga, obtusa, extus 

 basin versus ferrugineo-sericea, apicem versus cinereo-tomentella, 7-8 mm longa 

 et ca, 3 mm lata. Stamina 1 mm longa. disco connectivi piano breviter set con- 

 spicue setuloso. Pedunculus fructifer gracilis, rigidus, 3.5 cm longus. Monocarpia 

 ovoidea, glabra et nitida, basi breviter acutata, apice rotundata et brevissime 

 apiculata, ca. 10 mm longa et 5 mm diam., stipitibus 13-15 mm longis sustenta. 



TYPE: VENEZUELA: Territorio de Amazonas; Cerro de la Neblina, RloYatua, 

 in Clusia "moss-forest" elev. 650 m, Dec. 29, 1953, Bassett Maguire, John J. 

 Vturdack & George 5. Bunting 36970 (NY). 



This very characteristic species agrees most closely with Guatteria tricho- 

 stemon R.E.Fr. in having upright flowers with long peduncles and oblong petals. 

 This new species has markedly narrower petals of uniform width, tapering gradually 

 upwards. The hairiness of its leaves is also somewhat reminiscent of G. tricbo- 

 stemon in that the median nerves are at first hairy on the upper sides of the 

 leaves, but soon become glabrous. G. trie bos temon is the only so far known 

 species of the Trie hos temon section in which the median nerves are persistently 

 pilose on their upper sides. The difference between the two species compared 

 here is most marked in the shape of their leaves, which in G. stenopetala is 

 broadly oval, 4-5 cm broad, and in G. trichostemon oblong-lanceolate, 1.5-2 

 (-2.5) cm broad. 



Unonopsis rigida R.E.Fr., sp. nov. 



Frutex 5 m altus, Petiolus niger, crassus, glaber, supra planus, 2-3 mm 

 longus; lamina rigide chartacea, utrinque glaberrima, haud verrucosa, elliptica 

 vel elliptico-obovata, basin versus interdum paulo angustata, ima basi late rotun- 

 data non decurrens apice rotundata et abrupte cuspidata, (12-) 18-27 cm longa et 

 5-11 cm lata; costa utroque latere prominens, nervi laterales I. utrinque 14-15, 

 arcuato-adscendentes, 4-6 mm intra marginem conjuncti; reticulum venularum 

 supra planum et vix conspicuum, subtus paulo prominens. Inflorescentiae e ramulis 

 efoliosis exeuntes; pedicelli florum ca. 2.5 cm longi, tenues, brevissime et 

 laxiuscule rufo-sericei. Sepala semiorbicularia, ca. 1 mm longa. Petala 12-14 mm 

 longa et 9-10 mm lata, exteriora sericea, interiora praeter partem inter exteriora 

 expositam tomentellam glabra. Stamina 1.5 mm longa, connectivi appendice setu- 

 losa. Ovaria dense f errugineo-hirsuta. (Fructus ignotus.) 



TYPE: BRAZIL: Estado da Amazonas, Rio Negro, Porto Curucuhy, terreno 

 arenoso, with flowers, Oct. 6, 1945, Ricardo de Lemos Froes 21110. (NY). 



