304 Select Plants for Industrial Culture 



Primus tomentosa, Thunberg. 



Northern China. A very hardy species with cherry -like edible- 

 fruits. 



Prunus Virginiana, Lhm. 



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

 clime and fertile soil this tree attains a height of about 100 feet and 

 a stem-circumference of 16 feet. Endures the winters of Norway to 

 lat. 67 56' (Schuebeler). 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 acerbity. The bark 

 used in medicine. 



Psamma arenaria, Roemer and Schultes.* (P. littwalis, Beauvois; Cala- 

 magrostis arenaria, Roth.) 



The Morram, Marrem or British Bent-grass. Sand- coasts of 

 Europe, North-Africa and North-America. One of the most impor- 

 tant of reedy grasses with long descending roots, to bind moving 

 drift-sands on the sea-shore, for the consolidation of which this tall 

 grass and Elymus arenarius are chiefly employed in Europe. It de- 

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

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

 hence it never gets suffocated. The plant will by gradual upgrowth 

 finally form stems and roots, sanded in to a depth of fully 100 feet. 

 Psamma Baltica (R. & S.) from the Baltic- and North-Sea, serves 

 the same purpose. Both can also be used in the manner of Sparta 

 for paper-material, for tying and for mats. Like Elymus arenarius, they 

 are not touched by grazing animals. P. arenaria 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, at length 30 feet 

 high; its guava-fruit pale yellow and of apple-size. 



Psidium Araca, Raddi. 



From the West-Indies and Guiana to Peru and Southern Brazil, 

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

 guavas, already recorded by Piso and Marcgrav. The greenish-yellow 

 berry is of exquisite taste. 



Psidium arboreum, Vellozo. 



Brazil, province of Rio de Janeiro. The guava-fruit of this plant 

 measures about one inch, and is of excellent flavor. 



Psidium Cattleyanum, Sabine.* 



The Purple Gruava. 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, as well known, of delicious 

 flavor and taste, resembling thus far strawberries. P. buxifolium 

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



