1960] 



BOTANY OF THE GUAYANA HIGHLAND PART IV 



37 



VENEZUELA: Amazonas: occasional in high forest along trail to Guzman Blanco 1—5 

 km se of Maroa, Rio Guainia, alt. 120-140 m; tree 3-8 m; cauliflorous ; fls cream; 9 Oct 1957, 

 B. Maguire, John J. Wurdack $ W. M. Keith 41780 (holotype, US No. 2267414) ; Selva de 

 Maroa, Rio Guainia, alt. 127 m, 17 Feb 1942, L. Williams 14392 (paratype). 



This species differs from M. neblinensis, its nearer relative, in size and shape 

 of the leaflets, and in the length of inflorescence and the degree to which it coils ; 

 there are doubtless many good floral characteristics that separate the two species 

 but the lack of mature flowers in M. neblinensis makes critical comparison im- 

 possible. 



2. Myllanthus neblinensis Cowan, sp. nov. Fig. 22, e-f. 



Arbor 5 m alta, ramulis petiolis petiolulisque minutissime malpighiaceo- 

 strigulosis. Petioli 6.5-7.5 cm longi, petiolulis 1-2 cm longis, haud alatis ; laminae 

 chartaceo-coriaceae, plus minusve concoloratae, glabrae, 16-21 cm longae, 6-8 cm 

 latae, ellipticae, ad apicem acutae, ad basim attenuato-cuneatae, costa salienti, 

 venulis planis et inconspicuis supra, infra salientibus. Inflorescentiae scor- 

 pioideae, ca. 10 cm longae, axe et floribus minutissime malpighiaceo-strigulosis, 

 pedunculo 20-27 mm longo, pedicellis 3-4 mm longis. Calyx ad basim truncatus, 

 sepalis ciliolatis, rotundatis, 2.5 mm diametro, corolla androecium et gynoecium 

 valde immaturis. Fructorum cocci oblonga, 10 mm longa, 7 mm lata, valde trans- 

 verse costata, dense strigulosa. 



VENEZUELA: Amazonas: Cerro de la Neblina, Rio Yatua, in talus forest between 

 Camps "3 & 4, alt. 900-1000 m; tree 5 m; buds greenish; 8 Nov 1957, Bassett Maguire, John 

 J. Wurdack $ Celia K. Maguire 42001 (holotype, US No. 2267436). 



Ordinarily this material would await description for further collections to 

 be made but, since the slopes of Cerro de la Neblina are not likely to be visited 

 again for a very long time, I have given this a name. It differs from its nearer 

 relative, M. maroana, in leaf size and shape, and in characteristics of the in- 

 florescence. The flowers are very immature but sufficiently developed to determine 

 its affinity with this genus. 



3. Myllanthus ulei (Krause) Cowan, comb. nov. 



Cusparia ulei Krause, Repert. Sp. Nov. 2:26. Jan 1906. 

 BRAZIL: Amazonas: near Manaos, Ule 5382a (type). 



Lowlands near rivers in northwestern Brazil. 



Near Santa Izabel, Eio Negro, Ducke 339 (US) ; Manaos circa Cachoeira do 

 Hindu, Ducke 20478 (US). 



There are perhaps other species of Cusparia which should be removed to 

 other genera, but this one is certainly anomalous in the genus. The flowers 

 are less strongly arcuate than those of M. maroana, but in characteristics of the 

 calyx and inflorescence the relationship is quite clear. 



M. ulei is most nearly related to M. neblinensis and differs in having sessile 

 or nearly sessile flowers, and sessile leaflets on a relatively short petiole. 



Fig. 22. Myllanthus. a-d, M. maroana (Maguire, Wurdack <$• Keith 41780), a, one leaf. 

 X 0.25 ; b, portion of stem with ramiflorous inflorescences and inf rutescences, X 0.5 ; c, flower 

 at anthesis, X 2; d, one mature coccus of fruit, X 2; e-f, M. neblinensis (Maguire, Wurdack 

 4' Maguire 42001). e, leaflet, X 0.5; f, inflorescence with immature flowers, X 0-5. 



