280 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
trees which make up the forest are Bombax, Clusia rosea, Cecropia, 
Inga, Gilibertia, Linociera, and the palms Aerocomia, 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. 
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 Ileliconia 
Bihai and at one side is Acalypha. At an altitude of 500 m. in the 
Asuncion valley, that is, the northeast side of the island, there is con- 
siderable undergrowth. In the woods, Dioscorea, Smilax, Piper; 
by the "rios," Athyrocarpus, Costus, Calathea, Renealmia; and on 
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 hractcata; by 
rivulets are Cyperus, Scirpus, Eleocharis, and a few other Cyperaceae. 
Drymonia serrulata is one of the vines among the trees by the ''rio." 
Gonzalugania and Chiococca viicrantha 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 tree- 
fern, Cyathea. 
The wooded mountain top between 600 and 700 m. has practically 
no undergrowth. The low trees already mentioned are crooked and 
crowded together. They are covered with moss which is saturated 
with moisture. On the trunks may be found Polypodium jubaeforme 
and Xiphopteris serrulata, but practically nothing else, unless it is Lyco- 
podium and mosses. Above 700 m. or on the exposed part of the 
mountain top is a great variety of plants. The bromeliaceous genus 
Glomeropitcairnia is found growing thickly over parts of the top. 
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 beautiful 
Centropogon, several passion-flowers, the gentian Coutoubea, the 
silver fern and several sedges cover the top of the mountain. Such 
in general is the distribution of the plants according to regions. 
