82 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[vol. 10 



VENEZUELA: Bolivar: eumbre del Cerro Arepuchi, 600 m, Caroni, Guayana; Sep 

 1947, F. Cardona 2176 (holotype, US No. 1932164); same locality and collector, Mai 1945, 



1136. 



M. dcrothamnos, the epithet chosen to emphasize the unusual habitat of the 

 species atop one of the sandstone, tabletop mountains in Guayana (axpov: ''sum- 

 mit," Oajjivos: "shrub"), is most nearly related to M. canaliculatum but differs 

 in a rather large number of details. The present collections of the new species are 

 almost glabrous in both vegetative and fertile parts, the leaflets are relatively 

 wider, and the flowers are smaller. 



2'. Macrolobium cataractarum Cowan, sp. nov. Pig. 54. 



Arbor fruticosa 3-10 m alta, ramulis pilosulis sed mox glabrescentibus, 

 stipulis linearibus, 6 mm longis, caducis. Petiolum 2-5 mm longum, glabrum, 

 rhachibus 30-37 mm longis, angnste rigido-alatis. glabris, foliolis 8-10-jugatis. 

 glabris, (17-) 25-30 mm longis, 2.5-3.5 mm latis, linearibus, ad apicem obtusis 

 et mucronatis, leviter venulosis. Inflorescentiae terminales, 4-4.5 cm longae, axe 

 leviter minuto-puberulo, bracteis caducis, pedicello ca: 0.5-1 mm longo, micro- 

 puberulo, bracteolis 5.5 mm longis, 2.5 mm latis, ellipticis, acuminatis, minute 

 pilosulosis intus, extus micropuberulis. Hypanthium cupulare, 1.5 mm longum, 

 glabrum; sepala 5, lanceolata, acuminata, 2-3 mm longa, 0.7-1.5 mm lata, glabra; 

 petali stipes 4 mm longus, ad basim ciliolatus et sparse pilosulus, lamina sub- 

 orbiculari, ca. 5 mm diametro, glabra. Staminum filamenta glabra, 14 mm longa. 

 Stigma capitellatum, stylo ca. 12 mm longo; ovarium 1.5 mm longum, 0.7 mm 

 latum, ellipticum, marginaliter pilosulum, lateraliter glabrum, gynophoro ca. 

 0.5 mm longo, pilosulo. Fructus obovatus, compressus, glaber, 37 mm longus, 

 23 mm latus, stipite 5 mm longo, minute et sparse pilosulo. 



VENEZUELA: Ainazonas: frequent among rocks and boulders near "Salto Coro-Coro, Rio 

 Manapiare, alt. 150 m; shrubby tree 3-10 m high; fls pink; 28 Jan 1953, Bassett Maguire Sr 

 Celia K. Maguire 35025 (holotype, US No. 2281670). 



M. cataractarum (the epithet alludes to the habitat of the plant) is certainly 

 a. near relative of M. gracile, especially to var. confertum of that species. The 

 two taxa differ in shape and number of pairs of leaflets, pedicel length, pubes- 

 cence type on the gynoecium, and size of the fruit. 



10'. Macrolobium evenulosum Cowan, sp. nov. Fig. 53. 







Arbuscula 2-4 m alta, ramulis puberulis, stipulis caducis, triangularibus, 

 2 mm longis, 1 mm latis, acutis, eiliolatis, puberulis extus, intus glabris. Petioli 

 9-10 mm longi, puberuli, raehibus 9-10.5 cm longis, angnste rigido-alatis, leviter 

 puberulis; laminae angnste oblongae, foliolis 14-19-jugatis, sessilibus, rigidis, 

 18-22 mm longis, 4—5.5 mm latis, angnste oblongis, ad basim inaequilateraliter 

 obtusis, ad apicem rotundis, glabris supra, infra minute cano-strigulosis, costa 

 venulisque obscuris. Inflorescentiae 4.5-5.5 cm longae, sessiles, axe puberulo, 

 bracteis persistentibns, 5.5-7 mm longis, ca. 3.5 mm latis, elliptico-lanceolatis, 

 Mentis ad acuminatas, pilosulis extus, intus glabris, pedicello 2 mm longo, 

 puberulo, bracteolis persistentibns. 12-13 mm longis, ea. 5 mm latis, laneeoiatis. 

 acuminatis. pilosis intus, extus pilosulis. Hypanthium 2.5 mm longum, glabrum; 

 sepala 5 (duobus adaxilibus prope omnino connatis), 6-7 mm longa, 2.5-3 mm 

 lata, oblonga, acuta, glabra extus. intus sparse pilosa, ad apicem ciliata ; petali 

 stipes 8-9 mm longus, extus glaber, intus villosus, lamina obovata, attenuata 



