1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



basim versus, 6 mm longa, 1.5 mm lata, glabra. Staminorum filamenta 21 mm 

 longa, ad basim puberula. Stigma minute capitellatum, stylo 16 mm longo. 

 glabro ; ovarium oblongum. 4 mm longum. 1.5 mm latum, marginaliter sparse 

 puberulum, gynophoro 2.5 mm longo, puberulo. Fruetus ignotus. 



VENEZUELA: Amazonas: frequent along Elo Atabapo between mouth of Cafio Temi 

 and Manacal, alt. 125 m; shrub 2-4 m ; bracts and filaments red, petal white; 11 Jun 1959, 

 J. J. Wurdack 4- L. S. Adderley 42941 (holotype, US No. 2281708). 



M. evenulosum differs from both its near relatives. M. venvlosum and M. 

 flexuosum, in several respects: (1) Its leaflets are differently shaped and lack 

 any obvious venation (hence the specific epithet), although the position of the 

 costa is apparent by a slight depression on the upper surface of the leaflets; (2) 

 the bracts and bracteoles are several times longer; and (3) the petal differs in 

 the size and shape of its parts. In sepal number the new species approaches more 

 nearly M. flexuosum, in which species the adaxial pair are free from each other 

 or only slightly united basally. 



24. Macrolobium punctatum Spruce ex Benth. 



VENEZUELA: Amazonas: Sabana Jivoa, right bank of Rio Orinoco about 30 km above 

 mouth of Rio Atabapo (opposite Minieio), alt. 125 m, 1 Aug 1959, Wurdacl: 4' Adderley 43721. 



This is the first record of this species in Venezuela, although it is known by 

 collections from northwestern Brazil and in Colombia on the Rio Guainia. 



33a. Macrolobium suaveolens Spruce ex Benth. var. pakarimense Cowan. 



VENEZUELA: Amazonas: Clusia-scruh forest on lower slopes of Cerro de la Neblina, 

 alt. 700 m; 14-16 Nov 1957 and 31 Dec 1957, Maguire, TTurdacJ: # Maguire 42074, 42.56". 



These collections represent the first report of this species in Venezuela and a 

 considerable extension of range for this British Guiana variety. The new mate- 

 rial differs in having nearly glabrous bracteoles, whereas those of the original 

 collections were definitely puberulous. 



38. Macrolobium stenopetalum Amshoff. 



Wurdack & Adderley 42849 (unicate), from near San Fernando de Atabapo. 

 is fruiting but it matches very well the material of this species, except that the 

 fruit is shorter than in the original description. Since it has been known pre- 

 viously only from Tafelberg in Suriname, this Venezuelan collection represents 

 a considerable extension of range and a new record for Venezuela. 



Sclerolobium dwyeri Cowan, sp. nov. Fig. 58. 



Arbor 10-20 m alta, ramulis minute puberulis vel strigulosis, stipulis 12 mm 

 longis, pinnatis, segmentis lineari-subulatis. Petiolus 3.5-5 cm longus, apicem 

 versus valde 7-9 mm diametro inflatus, minute strigulosus, rhachi 8.5-12 cm 

 longa, minute strigulosa, foliolis 5-jugatis, petiolulis 4.5-5.5 mm longis. teretibus. 

 minuto-strigulosis. Laminae inaequilaterales, (paribus inferioribus mingribus, 

 o vat is, 6.5-7.5 cm longis, 3-4 cm latis). aliis 8.5-13 cm longis. 4-5.5 em latis. 

 ovato-ellipticis ad ellipticas, ad basim rotundatis ad leviter cordatas. ad apicem 

 acuminatis vel breviter acuminatis, parce strigulosis et glabrescentibus in faciebus 

 ambobus (costa strigulosa excepta), costa et venis primariis venulisque conspicue 



