1963] 



BOTANY OF THE GUAYAXA HIGHLANDS PART V 



199 



petiolatis, petiolis 5-10 mm long-is supra glabris vel subglabris subtus strigillosis, 

 laminis subcoriaceis subtus pallidioribus anguste elliptico-lanceolatis basi 

 cuneatim angustatis acutisque vel supremis subobtusis apice acutis vel subacutis 

 4.5-11 cm longis 1.5-3 cm latis supra glabris subtus costa media nervis lateralibus 

 venulisque parce strigillosis aliter glabris, nervis lateralibus utroque latere 9-11 

 arcuato-adscendentibus ante marginem anastomosantibus venulis supra nullis 

 subtus tenuissime prominulis ; inflorescentia terminali 4.5-5.5 cm longa basi 

 trichotoma, bracteis lanceolatis acutis vel acuminatis 1.5-2 mm longis extus 

 strigillosis pedicellatis ; pedieellis 3—4 mm longis hispidulo-strigillosis ; calycis 

 lobis 5 subaequalibus lanceolatis vel elliptico-lanceolatis acuminatis vel acutis 

 3-3.5 mm longis 0.8-1 mm latis extus strigillosis hispidulo-ciliolatis intus glabris ; 

 calycis tubo (hypanthio) subcampanulato 1.5 mm longo apice 3 mm lato extus 

 strigilloso ; corolla alba hypocrateriformi, tubo 16-20 mm longo basi 2.3-2.5 mm 

 lato supra 3.5 mm lato extus parce strigilloso intus in parte basilari 8 mm longa 

 glabra excepta aliter villosulo, fauce dense et sat longe sulphureo-villosula, lobis 

 lanceolato-oblongis apice subfalcato-acutis 15-16 mm longis 5-5.5 mm latis 

 glabris ; antheris lineari-oblongis apiculatis basi breviter subsagittatis 2.8 mm 

 longis 0.3 mm latis ; stylo 3-3.5 mm longo glabro ; stigmatibus elliptico-lanceolatis 

 2-2.5 mm longis ; capsula non visa. 



VENEZUELA. Amazonas: Sabana El Venado on left bank of Cano Pimichm 

 above Pimichm, Rio Guainia ; occasional; alt. 140 m ; shrub 2-A m; flowers white, 

 fragrant ; 14 Apr 1953, Maguire & Witrdack 35558 (holotype NY). 



This species differs from D. spigelioides Ducke of the Curicuriary branch of 

 the upper Rio Negro in the strigillose pubescence which covers the outer surface 

 of the corolla-tube, calyx-lobes, hypanthium, lower portion of leaf -blades, and 

 branches, in the much shorter styles not reaching the height of the anthers, and 

 in the much longer calyx-lobes. From the material available for examination it 

 would appear that the inflorescence of this species, like that of D. revoluta, is more 

 contracted and shorter, as well as narrower, than that of D. spigelioides, and has 

 a more crowded denser aspect. 



3. Dendrosipanea spigelioides Ducke, Arch. Inst. Biol. Veg. Rio de Janeiro 2 : 

 70. 1935. 



Distribution. State of Amazonas, Brazil. Known only from the region of the 

 Rio Curicuriary. 



BRAZIL. Amazonas : Rio Curicuriary affluentis Rio Negro superioris ; ad 

 ripas inundatas; 19 Oct 1932, A. Ducke 24426 (isotype NY). 



The isotype specimen at NY shows minor variations from the description of 

 the species. According to the material examined, this species has a larger, more 

 laxly branched inflorescence than either of the other two species of the genus. 



Henriquezia Spruce, ex Benth. in Hook. Kew Jour. 6 : 338. 1854. 



This genus has an interesting disrupted distribution, one species, H. jenmani 

 K. Schum. known from the Mazaruni River of British Guiana, all the remaining 

 species being known from the Rio Negro, Rio Guainia, and portions of the Upper 

 Rio Orinoco, and various tributaries of these rivers (Rio Curicuriary and Rio 

 Icana in Brazil, Rio Vaupes in Colombia, and Rio Atabapo, Rio Tenri, and 

 Rio Pacimoni in Venezuela). In the intervening large region no collections of 

 the genus are known. 



