280 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. on 
trees which make up the forest are Bombax, Clusia rosea, Cecropia, 
Inga, Gilibertia, Linociera, and the palms Acrocomia, Oredoxa, and : 
Bactris, all these being trees of a more or less straight trunk. The . 
crooked trees of 500 m. altitude or more are Guettarda, Hellia, Pisonia, — 
Nectandra, Phoebe, Psychotria, and Clusia lutea. At the summit — 
of the mountain are the dwarfed Clusia lutea, the wide-spreading — 
Blakea, Vaccinium, and Myrcia. He 
Among the trees of the lower altitudes there is little undergrowth, : 
consisting of the ferns or orchids. At an altitude of 400 m. on the : 
San Juan trail there is a small marshy area covered with Heheoma 
Bihai and at one side is Acalypha. At an altitude of 500 m.m the 
Asuncion valley, that is, the northeast side of the island, there 1s Coe 
siderable undergrowth. In the woods, Dioscorea, Smilax, Piper; 
by the “ios,” Athyrocarpus, Costus, Calathea, Renealmia; and bi : 
the rocks and trees, Philodendron, Anthurium, and Dieffenbachia, : 
together with many terrestrial and epiphytic ferns and orchids, may be 
found. Various members of the Gramineae are scattered throughout 
the woods. In open thickly grown places is Scleria bracteata; by 
rivulets are Cyperus, Scirpus, Eleocharis, and a few other Cyperacea®: — 
Drymonia serrulata is one of the vines among the trees by the “TO 
Gonzalugania and Chiococca micrantha at lower altitudes have slender 
ascending or climbing habits. Above 500 m. the melastomaceous — 
Clidemia and Miconia are to be found. The deep ravines are char- : 
acterized by the abundance of ferns, especially one ravine by the Or" 
fern, Cyathea. peg 
The wooded mountain top between 600 and 700 m. has practically | 
no undergrowth. The low trees already mentioned are crooked am : 
crowded together. They are covered with moss which is saturated 
with moisture. On the trunks may be found Polypodiwm jubaeforme 
and Xiphopteris serrulata, but practically nothing else, unless it 1s Lyco 
podium and mosses. Above 700 m. or on the exposed part of as 
mountain top is a great variety of plants. The bromeliaceous genus - 
Glomeropitcairnia is found growing thickly over parts of the Me 
The delicate Utricularia is abundant in the rich and moist humus 
The tiny shrub Sauvagesia, the vine Echites, and the sprawling : 
Epidendrum secundum, the erect Epidendrum nocturnum, the beaut 
Centropogon, several passion-flowers, the gentian Coutoubem, J 
silver fern and several sedges cover the top of the mountain. 
in general is the distribution of the plants according to regions. 
