1958] 



THE BOTANY OF THE GUAYANA HIGHLAND PART III 



151 



ovatae usque ad lato-ovatae, rigido-coriaceae, valde Yenosae, 9-14 cm longae, 4-8 

 cm latae, basi Yalde cordatae, apice acutae, supra leviter pilosae sed glabreseentes, 

 infra Yenis leviter pilosis, costa venisque leviter salientibus supra, infra valde 

 salientibus, venulis leviter impressis supra, infra leviter salientibus; inflorescen- 

 tiae 32-55 cm longae, axe puberulo, pedunculo 12.5-25 cm longo, pedicellis ca. 

 5 mm longis, strigulosis ; bracteolae "persistentes, ovatae, ca. 2 mm longae, 1.5 

 mm latae ; calyx externe strigulosus, tubo ca. 4 mm longo, lobis usque ad 7 mm 

 longis, acutis; fructus immaturus elliptico-oblongus, rufo-tomentosus, 9.5 cm 

 longus, 2.5 cm latus, marginibus leviter dilatatus. 



Type Collection: R. 8. Cowan & J. J. Wurdack 31252 (holotype NY), 

 ''woody vine to 1 m high. Fruit green. Lf. veins & veinlets impressed above. 

 Lflts. subconcluplicate. Occasional along West Rim of cumbre, Cerro Paru, Terr. 

 Amazonas, Venezuela, Feb 4, 1951." 



This is an exceedingly distinct species with little relationship to any species 

 other than an undescribed Colombian one and even there the similarity is only 

 a superficial resemblance involving characteristics of the leaflets. The rigidly 

 coriaceous, venose, cordate leaflets are distinctive. 



Diplotropis strigulosa Cowan, sp. nov. 



Arbor 20 m alta, 30 em diametro, ramulis strigulosis; stipulae triangulares, 

 2.5 mm longae, 1 mm latae, externe dense strigulosae, intus glabrae; folia 8-11- 

 foliolata, petiolo 2-4 cm longo, strigoso, rachibus 9.5-18.5 cm longis, strigosis; 

 foliola alterna vel saepe opposita, petiolulo 4-6 mm longo, strigoso, laminis 

 coriaceis, ellipticis vel lanceolato-ellipticis, apice acutis, extremitate obtuso, base 

 inaequilateraliter acutis, 7-11.5 cm longis, 3-4 cm latis, supra glabris, infra 

 (costa strigosa excepta) strigulosis; venae primariae secundariaeque prominulae, 

 costa leviter impressa supra, infra salienti; inflorescentiae paniculatae, ca. 15- 

 25 cm longae, axe subappresso-tomentoso, bracteis bracteolisque parvae, tomen- 

 tosis, 1.5-2.5 mm longis, pedicello 4-5 mm longo, subappresso-tomentoso; calyx 

 incurvus, 10 mm longus, externe strigosus et strigulosus, intus puberulus, lobis 

 3-3.5 mm longis; vexillum glabrum. 11-12.5 mm longum (stipite 3-4.5 mm 

 longo), trilobatum, lobo supero oblongo, 5 mm longo, 4 mm lato, obtuso, lobis 

 lateralibus aurieulatis, 2-3.5 mm longis; alae laminae glabrae, oblongae, 8.5 mm 

 longae. 5 mm latae, stipite ca. 4.5 mm longo*; petalorum carinae laminae glabrae, 

 ca. 7 mm longae, 4 mm latae, oblongae, stipite 4.5 mm longo; stamina 10, libera, 

 filamentis 6-7 mm longis, inaequalibus, glabris; pistillum subsessile ; stylus 5 

 mm longus, glaber ; ovarium tomentosum ; fructus ignotus. 



Type Collection: B. S. Cowan cf- J. Wurdack 31362 (holotype NY), "tree 

 20 m X 30 cm diam. Lflts. dark green above, subcoriaceous ; calyx red-brown ; 

 petals rose, wrinkled. Occasional in valley head above camp, Cerro Paru, 2000 

 m elev.. Terr. Amazonas, Venezuela, Feb 10, 1951." Paratype : 31392, same data 

 and collectors. 



Diplotropis is represented in Venezuela by very few species, none of which 

 are very closely related to D. strigulosa. The latter is somewhat similar to the 

 southern Brazilian D. ferruginea Bcnth. which has the leaflets villose or tomen- 

 tose beneath, and much smaller flowers. 



Dipteryx. 



There are some annoying nomenclatural muddles and some very interesting 

 morphological features in this genus, which the writer proposes to study sub- 



