74 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



found to be less precise than was originally thought, but this does not invalidate 

 the subgeneric structure erected initially; the basic groups are, for the most 

 part, just as recognizable now as then. Certainly, I do not intend to make any 

 major modifications in my earlier treatment until the genus is much better 

 known ; new species are being added to it with every expedition to the Guayana 

 region and a re-evaluation is not justified at this time. The genus is not so 

 confused and complex as Fasbendcr states; rather it is a genus so poorly known 

 in its component parts that it may tend to confuse the non-taxonomist. 



Dicymbe neblinensis Cowan, sp. now Fig. 50. 



Arbor 12 m alta, 15 cm diametro [DBII], ramulis novellis pilosulis, glabratis, 

 stipulis caducis. Petiolus 17-20 mm longus, pilosulus, rhachi (2.5-) 6-8 cm 

 longa, pilosula, foliolis (2-)3-jugatis, petiolulis 5-6 mm longis, pilosulis, laminis 

 inaequilateralibus, falcato-ovatis, 7-10 (-13) cm longis, 3-6 cm lat is. ad basim 

 obtusis (vel uno latere acuto), ad apicem acuminatis, glabris supra, infra parce 

 pilosulis ad costam et ad venas primarias, costa et venis primariis planis supra, 

 infra plus minusve salientibus. Inflorescentiae paniculatae, terminales, 12-15 Cm 

 long-ae, sericeae, bracteis caducis, triangularibus, 1-1.5 nun longis, extus sericeis, 

 pedicello 9-12 mm longo, sericeo, bracteolis 11-15 mm longis. 3-3.5 nun lat is. 

 oblongo-lanceolatis, ad apicem stipitato-glandularibus, stipite ca. 1 mm longo, 

 sericeis faciebus ambobus. Hypanthium ca. 5 nun Longum, inaequilaterale, cy- 

 lindricum; sepala 5-5.5 mm longa, 0.7— ().*> nun Lata, duobus adaxialibus paene 

 omnino connatis; petalum adaxiale expletum, pallido-flavum, glabrum intus, 

 extus ad costam villoso-sericeum, unguiculo 5 mm longo, lamina oblata, 6 mm 

 longa, 8.5 mm lata, petalo abaxiali ca. 3 mm long-o, lineari, petalis ceteris 

 ligulato-oblanceolatis, 8 nun longis, 1 mm lat is. Filamenta 9-12 mm longa 

 pilosula parce ad basim, antheris 1.7 mm longis, 0.8 mm latis, ovalibus, glabris 

 Stylus glaber, ovario sericeo, ca. 5 mm longo, 2 mm lato, compfesso-ellipsoideo 

 gvnophoro (in parte libera) ca. 1.5 mm longo, sericeo, in parte basali ad 

 hypanthium adnato. Fructus ignotus. 



VENEZUELA: Amazonas: in slope forest just north of Camp 3, Cerro de la Neblina, 

 alt. 650-700 m; tree 12 m X 15 cm DBH; petal 1, pale yellow, turning bright yellow with 

 age; stamens cream; 1 Jan 1958, Bassett Maguire, John J. Wurclack 4' Celia K. Maguire 

 42568 (holotype, US No. 2267459). 



This new species shares a number of characteristics with T>. stipitata but is 

 clearly distinct on the basis of the differences presented in the following key 

 in which Unave included all the known species of this section. 



Key to the Species of Dicymbe sect. Eremopetala 



1. Leaflets 1-2-jugate, the apex rounded, obtuse, or emarginnte. 2. 



1. Leaflets 3-jugate, infrequently 2-jugate, the apex acute to acuminate. 3. 



2. Leaflets 2-jugate, 3-6.5 cm long, 2-3.5 cm wide, more or less emarginate. Petals and 

 filaments sparingly strigulose, the stipe of the one complete petal 4 mm long, attenu- 

 ate basally. * 7. D. yutajensis. 



2. Leaflets unijugate, 8-10 cm long, 5-5.5 cm wide, the apex rounded and entire. Petals 

 and filaments villose ; stipe of the one complete petal 2 mm long, cordate basally. 



8. D. froesii. 



3. Leaf axis and costa of the lower surface of the leaflets pubescent, the petiolules 5-6 

 mm long. Pedicels 9-12 mm long. Sepals 5-5.5 mm long; petals centrally pubescent, 

 the blade of the complete petal oblate on a claw 5 mm long. Ovary densely sericeous. 



8/ D. neblinensis. 



3. Leaves glabrous, the petiolules 7-8 mm long. Pedicels 6-7 mm long. Sepals 7.5 mm 

 long; petals glabrous, the blade of the complete petal cordiform on a claw 6-8 mm 

 long. Ovary glabrous except for the strigose abaxial suture. 8". D. stipitata. 



