52 



The list is necessarily incomplete, but it will serve to show the 

 preponderance of tree species. The greatest number of indi- 

 viduals is found in Calyptranthes and Oxandra, with certainly 

 other arboreal species coming very close to them. The lack of 

 undergrowth is very marked, and throughout the forest one finds 

 an unbroken succession of ridges and slopes carpeted with little 

 but a covering of dried leaves. The grasses ArtJirostylidiutn 

 capillifoliuni, Oplisinenus Idrtclliis and PJinriis latifoluis are the 

 most common herbaceous species, and these with Rcnealviia 

 occidentalis are about the only ones that are frequent enough to 

 be noticed. 



The lack of undergrowth is due almost solely to the want of 

 available surface- or drainage-water. There is practically no 

 humus, for the reason that the conditions that will produce it 

 are wanting. We have therefore a dry, almost arid, but well- 

 wooded formation that is devoid of under-vegetation. 



Canons 



The gorges are as profusely covered as the adjoining forest- 

 floor is bare and naked. A list prepared from the collections in 

 a typical caiion will give some idea of the species likely to occur 

 in such places : 



Helicopliylliu)i sp. Oncidiiim sp. 



Campyloneuruiii aiigiistifolinin Pepcrouiia rohDidifolia 

 " PJiy nitidis " aciiniinota 



" latum " scandens 



Ceropteris calomelaena Pcpfromia obtiisifolia 



Aspleniuvi pmnihiin Boehjiieria littoralis 



Doryoptci'is pcdata Pilea niidicaulis 



Dryopteris sp. " inicropJiylla 



Polypodiuni Phivnda " sp. 



" polypodioidcs Rajania Jiastata 



Ant/iui'ium sp. Drymaria sp. 



Philodendron laceriim Picramnia pentaiidra 



Rencaliina occidenialis Pavonia Typlialaca 



Epidendruni cocldcatinn Marcgravia sp. 



PlairotJiallis Wilsoni Gilibertia arborea 



