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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



is a little over 1 cm long. The seeds are numerous, oblong to triangular, nar- 

 rowly papery-winged, 2-2.5 cm long, 1.3-1.7 cm wide; cotyledons orbicular, 

 about 1.3 cm wide, the sinus closed, the radicle 3 mm long, not surpassing the 

 lobes of the cotyledons. The plant is named A. album rather than A. spruceanum 

 because the petiole is longer than that of the latter, 1.5-2.5 cm long, and the 

 venation on the underside is slightly more expressed. Woodson (Ann. Missouri 

 Bot. Gard. 38: 196. 1951) hypothesizes possible hybridization to account for 

 variability in A. album. 



Aspidosperma decussatum Woods. 



The fruit is now known (T. Lasser 1805, Kavanayen, Bolivar, Mr 194(i). 

 Follicle stipitate, asymmetrically oval, narrowed at the base, about 7 cm long. 

 4.5 cm wide, velvety-pubescent, the ridge about 2 cm from the nearest margin, 

 the stipe 1.5 cm long; seeds many, orbicular, papery-winged, about 4 cm wide; 

 cotyledons orbicular, about 1.5 cm wide, the sinus closed; radicle 3 mm long, 

 not surpassing the lobes of the cotyledons. This opposite-leaved species has been 

 collected only in the area of the type locality, PtarL-tepui, Kavanayen, and 

 Chimanta. 



Aspidosperma exalatum Monachino, sp. now Figure 15. 



Arbor; ramulis primo puberulis, deniqne glabris; foliis alternis coriaceis 

 glabris; petiolis 1-1.5 cm longis; laminis oblongis, (6-) 10-13 cm longis, (3-) 

 4^6.5 cm latis, ad basin obtusis vel rotundatis, ad apicem rotunda! is emargi- 

 natisque, subtus pallidis ; nervis secnndariis ntrinque prominentibus, reticulo 

 venulorum prominulo ; fructibus sessilibns crasse lignosis inaequaliter ovatis, 

 5-10 cm longis, 3.5-4.5 cm lat is, tomentulosis minute rugulosis, ad apicem apicu- 

 latis; seminibus suboblongis vel ovatis, 4-5.5 cm longis, 2.5-3 cm latis, non 

 membranaceo-alatis, marginibus crassiuseulis angustisque; cotyledonis subob- 

 longis, ca. 4 cm longis, 2 cm latis ; radicula ca. 5 mm longa, lobos cotyledonorum 

 non excedenta. 



Tree 5-7 m tall, the branchlets moderately stout, puberulent when young, 

 becoming glabrous; leaves alternate or approximate, rigidly coriaceous, complete- 

 ly glabrous (old leaves) ; petiole dark, 1-1.5 cm long; blade oblong, obtuse or 

 rounded at the base, rounded and emarginate at the apex, thick-rimmed at the 

 margins, (6-) 10-13 cm long, (3-) 4—6.5 cm wide, paler beneath than above but 

 not markedly glaucous, the secondary nerves raised on both surfaces, the princi- 

 pal ones averaging 5-7 mm apart near the middle of the blade, the reticulation 

 of veinlets prominulous; flowers lacking; sepals (in fruit) ovate-lanceolate, 

 wliite-tomentulose outside, about 2 mm long; follicle thickly woody, asymmetri- 

 cally oval, sessile, apiculate at the apex, 5-10 cm long, 3.5-4.5 cm wide, closely 

 brownish or rusty-tomentulose, minutely roughened, the ridge about 2 cm from 

 the nearest margin ; seeds few in each follicle, smoke-colored, centrally tinted with 

 bluish-green, oblongish varying to ovate, not papery-winged, the margins rela- 

 tively thick and narrow, less than 1 cm beyond the embryo; cotyledons oblong- 

 ish, cordate or emarginate at the base with a close sinus, about 4 cm long, 2 cm 

 wide; radicle about 5 mm long, not surpassing the lobes of the cotyledons. 



Type: Basseft Maguire & John J. Wurdack 31611, Alto Rio Orinoco, Terri- 

 torio Amazonas, Venezuela, along Yapacana cano between laguna and Rio Ori- 

 noco, elev. 150 m ; March 20. 1953, tree (holotype NY). Paratype: VENEZUE- 



