1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



59 



APOCYNACEAE 5 



Ambelania oleaefolia var. riparia Monachino, var. nov. 



Haec varietas a var. oleaefolia statura altiore 3-6 m alta et foliis latioribus 



2- 4.5 cm latis reeedit. 



Differs from the savanna var. oleaefolia Monachino in its greater height, 



3- 6 m (instead of 0.2-0.8; "2 m" in Maguire et al. 30553), and broader leaves, 

 2-4.5 em wide (instead of 0.7-3 cm). The corollas in our specimens are larger, 

 the tube being 2.5-3 cm long, the lobes about 3 cm long, 8-12 mm wide. The 

 stamens are inserted about 7 mm from the base of the tube, the anthers are 

 5.8 mm long. The habitat is riparian. 



VENEZUELA: Amazonas: frequent along Cano Pimichm between Rio Guainia and Pimi- 

 chin, alt. 30-140 m; tree 3-6 m, flowers white; 2 Jul 1959, J. J. WurdacTc 4' L. S. Adderley 

 43179 (holotype, NY). Occasional along Carlo Yapacana, alt.-125 m ; shrub 3-5 m, flowers 

 white, fruit green; 17 Jun 1959, Wurdack 4 Adderley 43021 (paratype, NY). 



Aspidosperma exalatum Monachino, Mem. X. Y. Bot. Gard. 10:120. 1959. Fig. 

 43 A-D. 



VENEZUELA: Amazonas: frequent along Cano Temi just above Yavita, alt. 130 m; 

 shrubby tree 2-5 in, flowers white; 11 Jun 1959, J. J. Wurdack 4 L. S. Adderley 42935. 

 Locally frequent along Rio Guainia just below Banderita, alt. 110 m ; shrub 2-5 m, flowers 

 white; 26 Jun 1959, WurdacTc 4 Adderley 43195. 



This species was originally described from fruiting material. Flowering 

 specimens have now been collected. A. exalatum belongs in the series Xobiles in 

 Woodson's revision (1951). It has no very close relative, although its cymose 

 inflorescence suggests .4. album (Vahl) R. Ben. ex M. Pichon. Inflorescence 

 cymose, ample, the flowers crowded ; calyx closely sordid-ashy to brownish- 

 tomentellous without, the sepals ovate, unequal in size, obtusish. 1.8-2.2 mm 

 long; corolla carnose, completely glabrous outside, the tube cylindric, angulate, 

 5 mm long, papillate within, the lobes spiral-contorted to the right in aestivation, 

 dolabriform, 4.5 mm long, 1.5 mm wide, acutish at the apex; stamens inserted 

 near the middle of the corolla tube, the anthers about 1 mm long; ovary glabrous, 

 narrowed to the style at the apex. 



Aspidosperma verruculosum var. laeve Monachino, var. nov. 



Haec varietas a var. verruculoso foliis supra levibus, venis non prominulis, 

 et indumento inflorescentiae ferrugineo reeedit. 



Differs from var. verruculosum Muell.-Arg. in its leaves smooth above, the 

 veins not prominulous or verruculose-elevated. The leaves, rather, are like 

 those of .4. sprueeaaum Benth. ex Muell.-Arg. or forms of A. album (Vahl) R. 

 Ben. ex M. Pichon. The indumentum in the young inflorescence is ferruginous 

 instead of gray. The corolla-lobes are 1.5 mm long (flowers not fully expanded); 

 the anthers 0.7 mm long. 



YEXEZUELA: Amazonas: locally frequent along Cano Pimichm between Rio Guainia 

 and Pimichm, alt. 130-140 m; tree 5-8 m, buds cream; J. J. WurdacTc 4 L. S. Adderley 43280 

 (holotype, NY"); Rio Guainia, along Cano Pimichm, alt. 125-135 m; slender tree 10 m, 

 fruit brown; 14 Apr 1953, Maguire # WurdacTc 35663 (paratype, NY). 



The fruit (M. & W. 35663) was described under questionably determined 

 A. album in Mem. X. Y. Bot. Gard. 10: 119 (1958). The flowers now prove the 



5 By Joseph Monachino. 



