Naturalisation in Extra- Tropical Countries. 391 



seeds are sown and covered with brushwood, to prevent the seed 

 thus sown from moving. (Indian Forester xin., 450.) The plant 

 will by gradual up-growth 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. 



Psammogreton setifolium, Boissier. 



Persia and Afghanistan. An annual herb, the fruit of which is 

 locally used as an aromatic condiment and as a medicine [Brigade 

 Surgeon J. Aitchison]. 



Pseudophoenix Sargrenti, H. Wendland. 



Islets of Florida. A palm seldom above 25 feet high, therefore 

 easily placed. Comparatively hardy. 



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, Eaddi.* 



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. 



Psidium chry sophyllum, F. v. Mueller. (Abbevillea chrysophylla, Berg*.) 



The Guabiroba do Mato of South-Brazil. This tree attains a 



height of about 30 feet. The fruit is generally not larger than a 



cherry. Perhaps other species of the section Abbevillea would be 



hardy and worthy of cultivation. 



