1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



73 



Campsiandra macrocarpa Cowan. 



VENEZUELA: Amazonas: infrequent along Rio Yatua for 30 km above Piedra 

 Arauieaua, alt. 100-140 m; tree 15 m; petals white; stamens red; 20 Oct 1957, Maguire, 

 Wurdack $ Maguire 41932. 



When I described this species {Mem. N. Y. Bot. Gard. 10:147. 1958) only 

 leaves and immature fruits were available for study, but it seemed so distinct 

 that this appeared to be a prudent course. The above-cited collection now fur- 

 nishes additional characteristics that strongly support that action. These dis- 

 tinguishing features are presented in the following supplementary description: 

 Inflorescence a terminal panicle of racemes 15 cm long, the axes densely puberul- 

 ous; bracts and bracteoles very minute, the pedicels ascending at anthesis but 

 soon recurved. 14-17 mm long, densely puberulous, the hypanthium obconic, 7 

 mm long, ca. 5 mm in diameter, strigulose. Sepals 3.5-4 mm long, 3.5-4.5 mm 

 wide, very broadly ovate, rounded-obtuse, strigulose externally, glabrous within; 

 petals 15.5 mm long, 8 mm wide, obovate, rounded-obtuse, glabrous except 

 densely ciliolate marginally. Filaments 50-65 mm long, glabrous, the anthers 

 oval, 2 mm long, 1 mm wide, villose. Gynoecium glabrous, the style ca. 35 mm 

 long, the ovary narrowly oblong, ca. 5 mm long. 



In my key (Mem. X. Y. Bot. Gard. 8:111. 1953) this species will key out near 

 C. comosa var. laurifolia, but it is distinct from all other taxa in the genus 

 by the size of the flower parts, in addition to the leaf and fruit characters; 

 most of these, especially the perianth, art 1 considerably larger than in any of 

 the other taxa. 



Elizabetha leiogyne Ducke. 



VENEZUELA: Amazonas: frequent along uppermost Kio Yatua, alt. 100-140 m; tree 

 15-30 m; calyx pale green, petals white; 25-26 Oct 1957, Maguire, Wurdack 4' Maguire 41952; 

 locally frequent along stream in slope forest just beyond Camp 2, Cerro de la Neblina, alt. 

 200 m; tree 25 m; bracts pinkish, petals white, apically pink-tinged; 2 Nov 1957, Maguire, 

 Wurdack # Maguire 41986. 



In his review of the genus Ducke (Trop. Woods 37:21. 1934) gives the 

 range of this species as upper Rio Negro region of Amazonas, Brazil, so its 

 presence is not unexpected in the forests of adjacent Venezuela. These are 

 the first collections reported from the latter country. 



Dicymbe Spruce ex Bentham. 



Since the preliminary review of this genus in 1957 (Mem. N. Y. Bot. Gard. 

 9:337-343. 1957), I have described two additional new species and now still 

 two more new ones require such treatment. Keys are presented below to associate 

 the new taxa with their nearest relatives and to distinguish from each other 

 the members of assemblages that include new species. 



In the paper referred to above, the genus was divided into several sections; 

 in a recent paper Fasbender (Lloydia 22:139. 1959) mentions these sections 

 as having been "invalidated by subsequent findings ( Cowan, 1953)." It is 

 necessary to correct the author's misinterpretation of the additional informa- 

 tion presented in the latter reference. In the first place, the original treatment 

 was specifically described as " preliminary ; " it wa ; a tentative arrangement of 

 subgeneric taxa and nothing more. It is therefore not at all surprising that 

 there is no support in the pollen morphology for my alignment. The fact is 

 that some of the characteristics used in the preliminary key have since been 



