1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



85 



plus minusve salientibus. Inflorescentiae 15-25 em longae, axillares et ter- 

 minates, panieulatae. ramulis racemiformibus, axe minute striguloso. pedunculo 

 0-10.5 em longo. braeteis et braeteolis eadueis. bracteolis angnste lanceolatis, 

 aeutis, 1.5-2 mm longis, externe minuto-strigulosis. pedieello 2-3 mm longo, 

 serieeo. Hypanthium ea. 1 mm profundo, eampanulatum. externe serieeum. 

 Sepala cucullata. 2 mm longa. ovalia, eiliata. serieea. Petala lutea. elliptiea, 

 cuneata. 2.5-3 mm longa. obtusa. ad basim serieea. Filamenta 3.5-4.5 mm longa. 

 aureo-pilosa. Ovarium hispido-pilosum. pubibus suberectis. aureis. stylo glabro, 

 ea. 1.2 mm longo. Fruetus glaber, oblongo-elliptieus. 35-45 mm longus. 12 mm 

 latus. 



VENEZUELA: Amazonas: occasional along Cafio Pimichin below Pimichin, alt. 120-140 

 m; tree 12-15 m; fls bright yellow; "canache''; 10 Oct 1957, Baxsett Maguire. John J. Wur- 

 dack $ William M. Keith 41831 (holotype, US No. 2267418); locally frequent at edges of 

 sabanita on right bank of Rio Pacimoni 12 kin below mouth of Rio Yatua, alt. 100-140 m; 

 tree 10-20 m; fls bright yellow; 2 Oct 1957, Maguire, Wurdack 4' Maguire 41652; en la selva 

 alta, f rondosa de tierra firme, Solano, Bajo Casiquiare, alt. 100 m ; arbol de taniano mediano 

 (18 m), con eopa abierta de forma irregular; tronco 25 cm de diam, algo redondo, no derecho, 

 libre de ramas por las % partes de la altura ; corteza morenisca, algo fissurada y el liber 

 Colorado obscuro ; la albura es de color claro, y el duramen mas obscuro ; 1 ' N.V. : Canasti 

 (Bare)"; 11 Mar 1942. L. Williams 14734. 



The pectinate stipules are similar to those of N. guiancnsis but N. dwycri has 

 much shorter braeteoles and pedicels, obovate rather than linear petals, and 

 leaflets with prominent secondary-tertiary vein-reticulum. The new species is 

 named for John D. Dwyer. the most recent student of this group, in recognition 

 of his contributions to the knowledge of tropical American Leguminosae. 



Sclerolobium pimichinensis Cowan, sp. now Fin. 57. 



Arbor 15-30 m alta, ramulis dense minuto-strigulosis, stipulis eadueis. 

 Petiolus 4.5-5 cm longus. dense minuto-strigulosus, teres, rhachi 12-13 cm longa, 

 minuto-strigulosa, tereti. foliolis 4-jugatis, petiolulis 6-9 mm longis. dense 

 minuto-strigulosis. laminis 10.5-17 cm longis, 5.5-8.5 cm latis. ovalibus ad ellip- 

 ticas, ad basim aeutis ad subobtusas, ad apicem rotundis, puberulis ad costam 

 supra, infra aureo-serieeis, eosta salienti. 5-7 venis primariis planis supra, infra 

 salientibus. Inflorese-entiae paniculato-raeemosae, ad 20 cm longae. axe dense 

 minuto-striguloso, pedunculo 38-60 mm longo. braeteis eadueis, subulato- 

 linearibus. 4.5 mm longis, dense minuto-strigulosis, pedieello 1.3-1.5 mm longo, 

 minuto-striguloso. Hypanthium eampanulatum. ea. 1.5 mm profundo. dense 

 minuto-strigulosum. calycis segmentis 2 mm longis. 1.5-1.8 mm latis. rotundis. 

 dense strigulosis extus, intus parce villoso-sericeis, petalis 2 mm longis, 0.2 mm 

 latis, linearibus. villosis. Filamenta 2.5-3.5 mm longa. dense aureo-villosa. 

 Ovarium 1.5 mm longum. anguste ellipticum, rufo-strigosum. stylo glabro. 0.8 

 mm longo. Fruetus ignotus. 



VENEZUELA: Amazonas: occasional along Caiio Pimichin, below Pimiclnn, Rio Guainia, 

 alt. 120-140 m; tree 15-30 m; fls pale yellow; 10 Oct 1957, Bassett Maguire, John J. WurdacTc 

 4- William If. Keith 41830 (holotype, US No. 2267417). 



In Dwyer 's treatment of this genus (Lloydia 20:67. 1957.") this collection 

 should key-out near 8. eriopetalum, to which it bears considerable resemblance. 

 The latter has the leaflets acuminate and the base obtusely inequilateral ; its 

 petals are larger, and its bracts are often persistent. 



