1963] 



BOTAXY OF THE GUAYANA HIGHLANDS PART V 



207 



generally acutish or acutely obtuse type characteristic of H. macrophylla. In most 

 of the collections examined of H. nitida var. nitida, generally two petiolar glands 

 are present, whereas only one is usually present in H. macrophylla. However, 

 only one may be found in some specimens of H. nitida var. nitida, as in Maguire, 

 Wurdack, & Bunting 36640, again indicating some variability in this character 

 between the two taxa. In Pires 699 the calyx-lobes are more conspicuously caudate 

 or long-acuminate with tips 3-4 mm long instead of 1-2.5 mm long and less 

 slender as in Ducke 293. 



In view of the variations indicated above and intergradation of the various 

 characters used for separation of the taxa, H. macrophylla is here considered as 

 a variety within the H. nitida complex rather than as a distinct species. 



3c. Henriquezia nitida var. subcuneata Steyermark, var. now 



Arbor 6.5-12-metralis ; stipulis lanceolatis vel lineari-lanceolatis acuminatis 

 20-35 mm longis 3-4 mm latis cano-f ulvo-tomentellis ; f oliis 4-verticillatis, 

 petiolatis ; petiolis 15-22 mm longis glabris ; petioli glandula basilari una sub- 

 orbiculari vel horizontaliter oblonga ca. 2 mm alta 3-4 mm lata ventraliter inserta; 

 laminis coriaceis subtus pallidioribus late obovatis apice late obtusis vel acute 

 obtusis basin versus manifeste angustatis subcuneatisque 27-36 cm longis 10-14 

 cm latis glabris ; nervis lateralibus utroque latere 12-15 arcuato-adscendentibus 

 ante marginem laxe tenuiterque anastomosin facientibus utrinque prominentibus 

 20-25 mm disjunctis, subtus venulis saepius magis bene reticulatis ; inflorescentia 

 dichqtome eymosa 13 cm alta 15 cm lata, ramis lateralibus primariis quaternatim 

 verticillatis 2.5-3.5 cm longis, in omnes partes fulvo-tomentellis, rhachibus inter- 

 nodiis 2.5-3 cm longis disjunctis, omnibus cum ramis secundariis duobus 1.5-2 

 cm longis, omnibus cum ramis tertiariis duobus ca. 1 cm longis ; pedicellis 5-15 mm 

 longis ; bracteis in anthesi caducis ; calycis lobis 4 usque ad basin partitis ovato- 

 lanceolatis acutis vel acuminatis 10-11 mm longis 3.5-4 mm latis cano-fulvo- 

 tomentosis ; corollis maturis non visis ; capsula non visa. 



Distribution. Upper Rio Xegro, state of Amazonas, Brazil. 



BRAZIL. Rio Negro, Preto, Campina ; open country ; tree 20 ft ; flowers rose 

 with red strip ; 18 Nov 1947, R. L. Froes 22885 (holotype NY, isotype US). 



This variety may be distinguished by the large obovate leaf-blades which are 

 long-tapering to the base, by the somewhat prominent, subreticulate venation, 

 and by tne prominent lateral nerves on both lower and upper surfaces. 



3d. Henriquezia nitida var. oblonga (Spruce ex Benth.) Steyermark, comb. nov. 



Henriquezia oblonga Spruce ex Benth. Trans. Linn. Soc. 22: 297. 1859. 



Arbor 4-5 m alta ; foliis 3-4-natim verticillatis anguste oblongis vel apiculatis, 

 laminis 9-17.5 cm longis 2.5-5.5 cm latis subtus pallidioribus, supra nervis 

 lateralibus impressis subtus vix prominulis vel subobsoletis utroque latere 12—15 ; 

 petiolis 9-30 mm longis glabris vel minute parce puberulentibus ; petioli duobus 

 glandulis orbicularibus vel ovalibus 0.7-1 mm altis 0.7 mm latis ventraliter in- 

 sertis ; stipulis lanceolatis vel lanceolato-linearibus acuminatis 12-17 mm longis 

 1.2-2.5 mm latis dense tomentellis; inflorescentiis 9-15-floris 4.5-9 cm longis 

 (altis) 6.5-15 cm latis, ramis lateralibus 1.5-2.2 cm longis, pedicellis 4-12 mm 

 longis velutino-tomentosis pilis fulvis dense vestitis ; calyce 15-22 mm longo, lobis 

 4 inaequalibus ovatis vel elliptico-ovatis acutis vel acuminatis duobus majoribus 

 latioribus magis acuminatis 12-17 mm longis 4.5-8 mm latis usque ad ovarium 



