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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 9, No. 3 



I 



diversity in the group. There is, however, very little such variation, at least in 

 the few collections known. The glabrous and strongly punctulate leaflets, in only 

 two pairs, serve to separate D. corymbosa from its relatives. 



4. Dicymbe jenmani Sandwith, Kew Bull. 1928:373. 1928. 



This is a small tree 2.5-8 m tall which is quite closely related to D. jraterna. 

 It is apparently restricted to the sandstone mountains; it is now known from the 

 Kaieteur Plateau and Mt. Ayanganna. (See the discussion following the descrip- 

 tion of D. jraterna.) 



The following collections represent this species: BRITISH GUIANA: Kaieteur Pla- 

 teau, Maguire & Fanshawe 23157, 32224, Maguire & Maguire 40683, 40687. 



5. Dicymbe fraterna Cowan, sp. nov. 



Arbor 3-20 m alta, ramulis novellis fusco-tomentulosis, stipulis non visis. 

 Folia (2-) 3 (-4)-jugata, petiolis 4.5-5 cm longis, teretibus, fusco-tomentulosis, 

 rachibus 4.5-11 cm longis, fusco-tomentulosis; petiolulis 4-5 mm longis, fusco- 

 tomentulosis; foliolorum laminae ovatae, elliptico-ovatae, ellipticae, 8-17.5 cm 

 longae, 4.5-7 cm latae, ad basim rotundatae, ad apicem acuminatae vel longo- 

 acuminatae, glabrae nitidaeque supra, infra tomentulosae ceriferaeque, granulis 

 cereis annulariformibus, minutissimis ornatae, costa impressa supra, infra 

 salienti, venis salientibus infra, supra plana vel cum venulisque minute reticu- 

 lars. Inflorescentiae terminales et axillares, coraposito-corymbosae, tomentu- 

 losae tomentosaeque, 9-5-10 cm longae, sessiles, bracteis caducis, induratis, 

 subsemicircularibus, obtusis, glabris intra, extus tomentosis; pedicellis 2-3 cm 

 longis, tomentulosis et tomentosis, sulcatis, bracteolis liberis, crasso-coriaceis, 

 late ovalibus, 26-28 mm longis, 14-20 mm latis, obtusis, tomentulosis et tomen- 

 tosis extus, intus glabris vel sparse strigosis margine excepto, hoc 1-2 mm lato 

 et dense tomentuloso, costa ad dorsum nonnihil salienti. Hypanthium cupulare 

 5.5-7 mm longum, 8.5-10 mm diametro, tomentulosum et tomentosum extus, intus 

 glabrum; sepala 4, uno dorsuali triangulari, 22 mm longo, 12 mm lato, acuto, 

 dense strigoso extus, intus glabro, cetera anguste-triangulari-lanceolata, acuta, 

 20-22 mm longa, 5-6 mm lata, dense strigosa extus s intus glabra; petala 5<; 

 angusto-elliptica vel oblanceolata, acuta, dense strigosa extus, intus glabra, 

 25-27 mm longa, 7-12 mm lata. Stamina 10, 45 mm longa, basaliter villosa, 

 antheris oblongis, glabris, 9 mm longis, 2 mm latis. Stigma peltatum, 1.5 mm 

 diametro; stylus 40 mm longus, glaber; ovarium ca. 5 mm longus, 4 mm latum, 

 densissime villosum, 9-ovulatum, gynophoro ca. 5 mm longo, dense villoso ad 

 apicem. Fructus immaturus oblongus, dorsualiter sulcatus, ad 18 cm longus, 3-4 

 cm latus, lateraliter compressus, tomentosus villosusque. 



rtPE: 3-4 m tree, lvs. glaucescent below; flowers creamy-white in rufous- 

 tomentose inflorescences, young fruit rufous-velvety. Frequent on Samwarakna- 

 tipu (Holi-tipu), Pakaraima Mts., Kamarang R. , British Guiana, Nov. 10, 1951, 

 Bassett Maguire & D. B. Fanshawe 32535 (NY). Paratypes: tree 23 ft high, in 

 sandy soil; calyx light brown; petals yellow. Membaru Creek, upper Mazaruni R., 

 British Guiana, Sept. 23, 1939, Pinkus 31\> tree 70 ft high; trunk 14 in diam. 

 Pod brown without, lemon-yellow within, often 3-seeded; seeds white. Membaru 

 Creek, upper Mazaruni R., British Guiana, Feb. 16, 1939, Pinkus 237; tree with 

 brown fruit, Ayanganna to- Chinowieng, Pakaraima Mts., 1000-1200 m alt., Feb. 

 7-8, 1955, B. Maguire, W. M. C Bagshaw, & C. K. Maguire 40632. 



The similarity in aspect between the new species and D. jenmani is so 

 marked that the materials cited above were originally considered to represent the 

 latter species. However, there are some very fundamental differences. D. jenmani 



