20G 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



Maguire 29322 (NY) ; Rio Pacimoni 50 km aboye mouth; tree 40 m high, 50 cm 

 diam; leaves in 4's; corolla flushed pink, orange-spotted and striped within; alt. 

 100-140 m ; 27 Nov 1953, Maguire, Wurdack, & Bunting 36640 (NY) ; ad flumina 

 Casiquiari, Vasiva et Pacimoni, 1853-54, B. Spruce 3690 (isotype NY, Photo NY, 

 Photo of Berlin sheet F, NY, fragment of isotype F) ; "Plantae Yavitensis Nov 

 1845," ex herb. Vargasii (US). BRAZIL : Amazonas: basin of Rio Negro, Rio 

 Vaupes ; tree 20 ft high ; caatinga ; 11 May 1942, Krukoff 12573/ 297 (F) . 



3b. Henriquezia nitida var. macrophylla (Ducke) Steyermark, comb. nov. 



Henriquezia macrophylla Ducke, Notiz. Bot. Gart. Berl. 11: 475. 1932; Arch. Jard. Bot. 

 Rio de Janeiro 6: 92. 1933. 



Distribution. State of Amazonas. Brazil, along tributaries (Igana, Curicuriary, 

 and Vaupes) of the Rio Negro. 



BRAZIL. Amazonas: ad ripas fluminis Curicuriary affluentes Rio Negro 

 superioris; 28 Nov 1929, A. Ducke 22815 (holotype RIO, isotype US); Rio 

 Curicuriary acima das cachoerias, margem ; arvore pequeria ; flores roses ; 29 Nov 

 1936, Ducke 293 (NY); Rio Icana, Masarico ; arvore de 15-20 mts. ; madeira 

 dura ; flores roseo-avermelhadas ; 22 Oct 1947, J. Murca Pires 699 (2 sheets, NY) ; 

 Rio Issana, Tunui; common along rocky banks; Oct 1947, Schultes & Pires 8967 

 (2 sheets, F) ; Igarape Piaiauara, Rio Curicuriari ; tree about 40 ft high; bark 

 shaggy, grey ; wood relatively hard, white ; 26-27 Apr 1948, Schultes & Lopez 

 985? (F); Igarape da Chuva, Taracua, Rio Vaupes, between Ipanore and con- 

 fluence with Rio Negro, 12 Nov 1947, Schultes & Pires 9061 (US). 



The isotype of Henriquezia macrophylla Ducke (Ducke 22815) has the leaves 

 rounded and only slightly mucronate at the apex, and matches in size and shape 

 some of the larger ones encountered in H. nitida var. nitida, such as in the collec- 

 tion of Maguire, Wurdack, & Bunting 36640. However, the lateral nerves of the 

 leaf-blades of the isotype specimen are fewer and more widely separated. A 

 topotype of H. macrophylla (Ducke 293), identified by Ducke as H. macrophylla, 

 shows the leaf-blades more acutely obtuse or acutish, as do the other collections 

 (except Schultes & Pires 9061). The isotype material may be interpreted as 

 the less common variant of H. macrophylla having a more rounded apex of the 

 leaf-blade. 



When Ducke described H. macrophylla, its affinities were stated to be with 

 H. ohovata Spruce ex Benth. and H. verticillata Spruce ex Benth. Judging, how- 

 ever, by the persistent stipules, leaf shape, and nervation, as well as prominent, 

 imbricatp calyx-lobes divided all the way to their base, i.e., to the summit of the 

 ovary, it is apparent that the true affinities of this taxon lie with H. nitida Spruce 

 ex Benth. var. nitida. The main points of variance shown from H. nitida var. 

 nitida by H. macrophylla are the generally acutish or acutely pointed leaf -blades 

 (although rounded to broadly obtuse in the type collection of H. macrophylla) , 

 generally fewer pairs of lateral nerves more widely spaced, and generally a 

 solitary petiolar gland. 



The lateral nerves on the lower surface are of the slightly elevated type 

 encountered in H. nitida var. nitida rather than of the prominently elevated type 

 present in H. verticillata. Those on the upper surface of H. verticillata are 

 prominently sulcate, whereas in H. nitida var. nitida and H. macrophylla they 

 are merely impressed or even slightly elevated. Although the apex of the leaf- 

 blades in H. nitida var. nitida are chiefly rounded or subtruncate, some of them 

 occasionally are somewhat acutely obtuse, thereby exhibiting a transition to the 



