202 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



some tree appears only to have been collected in this single locality"). Plate 33 

 shows the five corolla-lobes pubescent within. On a single large detached leaf- 

 blade, the apex is drawn as broadly rounded and mucronulate, while the whorls 

 of leaf -blades at and just below the inflorescence are shown as definitely acute 

 or acuminate. 



Henriquezia jenmani is known thus far only from British Guiana and repre- 

 sents an isolated eastern outlier of a genus whose distribution otherwise is con- 

 fined to the drainage of the Upper Rio Negro, Guainia, and Upper Orinoco of 

 southwestern Venezuela, adjacent Colombia, and state of Amazonas in north- 

 western Brazil. This species is unique in the genus in having 1) all the corolla 

 lobes, instead of one of them only, with pubescence on the inner surface, 2) 

 glaucous lower surface of the leaf-blade with a minute dense papillate surface, 

 and 3) a loose, ascending hirtellous pubescence on the inner surface of the stipules 

 as contrasted with the minutely tomentose or sericeous- velutinous short tomentum 

 of the other species. 



In the original description the leaves are stated to be ternate. The herbarium 

 specimens of Forest Dept. F 847 show leaves varying from ternate to quaternate. 

 Although the length of the stipules is given as 1.7-2 cm long in the original de- 

 scription, the specimens of Forest Dept. F 847 have stipules only 0.9-1 cm long. 

 The petioles in the original description are stated to be 2-2.5 cm long, whereas 

 measurements of Forest Dept. F 847 specimens show petioles varying from 1-1.7 

 cm long ; moreover, the photograph of the holotype shows petioles not exceeding 

 1.7 cm in length. Probably the most serious divergence is in Schumann's descrip- 

 tion of the lower surface of the leaf -blades as ' ' subtus opacis tomento minutissimo 

 canescentibus reticulatis" (loc. cit. p. 135). Actually, the specimens examined of 

 Forest Dept. F 847 have the lower surface of the leaf -blades gray-white or * ' glau- 

 cous," but they are glabrous and without any tomentum; instead, their surface 

 has a dense white papillate covering over a reticulate venation. It is not glaucous, 

 since it has no ' ' bloom ' ' which can be rubbed off. It is believed that Schumann 's 

 description must be re-interpreted to mean a densely gray-white papillate surface 

 produced over a reticulate venation. 



Furthermore, in the original description the corolla is stated to be 50 mm long, 

 w r hereas present measurements of the Forest Dept. F 847 specimens show the 

 corolla length as 35-41 mm. However, it has been found that corolla measurements 

 in the other species of Henriquezia are subject to considerable variation, depend- 

 ing on conditions of pressure and shrinkage after drjdng. 



The lateral branches of the inflorescence shown in the photograph of the 

 holotype specimen at NY attain 5 cm in length, whereas on the Forest Dept. F 847 

 specimens they are only 1.5-2.5 cm long. Despite the above discrepancies, how- 

 ever, there appears to be no doubt of the conspecific identity of the Forest Dept. 

 F 847 specimens with the holotype of Jenman 629. 



2. Henriquezia verticillata Spruce ex Benth. in Hook. Kew Jour. Bot. 6: 338. 

 1854. 



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



Henriquezia obovata Spruce, described from a single fruiting specimen by 

 Spruce along Upper Rio Negro (Guainia) above confluence of Casiquiare, appears 

 to be identical with H. verticillata collected by Spruce in flower from Brazil 

 along Rio Negro above Barraroa to San Gabriel do Cachoeiras. The base of the 

 leaf-blade is rounded in H. obovata, cuneately narrowed in H. verticillata, 4- 



