270 SELECT PLANTS FOR INDUSTRIAL CULTURE 



Prunus Virginiana, Linne. 



The Choke Cherry-tree of the United States. In a mild clime and 

 fertile soil this tree attains a height of 100 feet and a stem of 16 

 feet in circumference. The wood is compact, fine-grained, and not 

 liable to warp when perfectly seasoned, of a dull light-red tint, 

 deepening with age. The fruit finally loses its austerity. 



Psamma arenaria, Roemer and Schultes.* (P. littoralis, Beauvois ; 

 Calamagrostis arenaria, Roth.) 



The Morram, or Marrem, or Bent Grass. Sand-coasts of Europe, 

 North Africa, and Middle North America. One of the most important 

 of reedy grasses, with long descending roots, for binding moving drift- 

 sands on the sea-shore, for the consolidation of which in Europe chiefly 

 this tall grass and Elymus arenarius are employed. It delights in 

 the worst of drift-sands, and for its full development gradual accu- 

 mulation of fresh sands around it becomes necessary (Wessely) : 

 hence it never gets suffocated. The plant will by gradual up- 

 growth finally form stems and roots sanded into a depth of fully 

 100 feet. Psanima Baltica (R. and S.), from the Baltic and North 

 Seas, serves the same purpose. Both can also be used in the 

 manner of Sparta for paper material, for tyeing and for mats. 

 Like Elymus arenarius, it is not touched by grazing-aiiimals. It 

 collects the sand-heaps at the tops of ridges, while the Elymus 

 fastens their sides. 



Psidium acidum, Martius. 



Higher regions on the Amazon River. A tree 30 feet high ; its 

 Guava-fruit pale yellow and of apple size. 



Psidium Araca, Raddi. 



From West India and Guiana to Peru and Southern Brazil, where 

 it is found in dry high-lying places. This is one of the edible 

 Guavas, recorded already by Piso and Marcgrav. The greenish 

 yellow berry is of exquisite taste. 



Psidium arbor eum, Yellozo. 



Brazil ; province Rio de Janeiro. This Guava-fruit measures about 

 one inch, and is of excellent flavour. 



Psidium Cattleyanum, Sabine.* 



The Purple Guava, Brazil and Uruguay. One of the hardiest of 

 the Guava-bushes, attaining finally a height of 20 feet. The 

 purple berries are seldom above an inch long, but of delicious 

 flavour and taste, resembling thus far strawberries. P. buxifoliuin 

 (Nutt.), of Florida, seems nearly related to this species. 



