1963] 



BOTANY OF THE GUAYAXA HIGHLANDS PART V 



203 



verticillate in H. obovafa and mainly 5-verticillate in H. verticillata, but there 

 is variability in leaf -base in H. verticillata, and the base of the leaf -blade cannot 

 be used to separate the two, nor can 4- or 5-verticillate arrangement. Also, leaf- 

 shape and length and width are quite variable. The photo of the type of H. obovata 

 shows the prominently elevated lateral nerves of the lower side of the leaf -blade, 

 which likewise are characteristic of the leaves of H. verticillata. 

 Two variations may be recognized : 



Main leaf -blades rounded, truncate, or retuse at apex. 2a. H. verticillata var. verticillata. 



Main leaf-blades abruptly acute to subacuminate, or rarely obtusely acute at apex. 



2b. H. verticillata var. apiculata. 



2a. Henriquezia verticillata Spruce ex Benth. var. verticillata Fig. 72, K-M. 



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

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



Distribution. Rio Negro, state of Amazonas, Brazil, and Rio Guainia and 

 Territorio Federal Amazonas, Venezuela. 



VENEZUELA. Amazonas: along the Guainia, above the confluence of the 

 Casiquiare; tree 40-60 ft. high; leaves constantly 4 together; June, 1854, Spruce 

 s. n. (photo NY) ; along Rio Guainia near Maroa ; occasional ; large riverine tree ; 

 leaves (4-)5-whorled ; corolla white, each lobe with central pink line, the throat 

 and tube within orange-speckled, one lobe with yellow markings ; alt. 120-140 m, 

 27 Nov 1953, B. Maguire, J. Wurdaek, & G. Bunting 36132 (NY). BRAZIL. Edo. 

 Amazonas: secus Rio Negro, inter Barcellos et San Isabel (Rio Negro, gapo, 

 frequent from above Barraroa to Sao Gabriel) ; tree 80-100 ft by 4 ft; flowers 

 odoriferous, pink without, white within with a streak of yellow pubescence in 

 front ; Dec 1851, Spruce 1957 (photo NY, isotype NY) ; Cucui, Rio Negro ; arvore, 

 25 metros, 50 cm ; belo ornamento, flores em profusao ; 14 Dec 1945, Froes 21518 

 (NY, US) ; Rio Negro, Preto, Maboaby ; border of river near to caatinga ; tree 

 40 ft ; high land, high forest ; flowers rosy, white red strip ; 17 Nov 1947, Froes 

 22872 (NY, US) ; same locality, 8 Nov *1947, Froes 22784 (NY); Manaos, ad 

 ripas paludosas rivuli. Mindn superioris ; arbor magna; flores albi, tubo intus 

 striis purpureis et linea lutea pilosa ornato ; 22 Oct 1929, Ducke 22813 (NY, US) ; 

 Manaos, igapo do Igarape Mindu no curso superior ; arvore grande ; corola branca 

 comdesenhos roseos e. do lado interior con sinal amarelo; 12 Nov 1942, Ducke 

 81 (US). 



The leaves in the type description are stated to be 1 'obtusiuscula v. breviter 

 et acuta acuminata" at the apex, and "cuneato-acuta" at the base; they vary 

 on the same specimen from broadly rounded at the apex with a minute mucro 

 to, especially the uppermost ones subtending the lowest inflorescence branches, 

 cuspidate or abruptly acute to acuminate, and at the base from cuneately 

 narrowed to subcordate. This is shown by specimens of Froes 21518 and Froes 

 22784 (NY), in which some leaves are cuneate, others rounded at base. Duplicate 

 specimens of these same numbers seen by Bremekamp apparently had all the 

 leaves rounded at base, causing him to err in believing that these numbers differed 

 from typical H. verticillata in cuneate versus rounded leaf -bases. He also mis- 

 judged in believing that these numbers, together with Ducke 81 and 22813, had 

 the leaves with a smaller number of pairs of nerves ( 7-9 instead of 11). Although 

 Bentham does not account for the number of lateral pairs of nerves in his original 

 description of H. verticillata, actually an examination of the isotype specimen of 

 H. verticillata (Spruce 1957) at NY shows 9-10 pairs of nerves, while a photo 



