Naturalisation in Extra- Tropical Countries. 393 



Psidlum polycarpon, Al. Anderson.* 



From Guiana to Brazil, also in Trinidad. A comparatively small 

 shrub, bearing prolifically and almost continuously its yellow berries, 

 which are of the size of a large cherry and of exquisite taste. 



Psidium rufuxn, Martius. 



Brazil, in the province of Minas Greraes, on sub-alpine heights. 

 This guava-bush gains finally a height of 10 feet, and is probably 

 the hardiest of all the species producing palatable fruit. 



Psophocarpus tetragronolobus, De Oandolle. 



Tropical Africa, perhaps to Madagascar. A climber with annual 

 stem ; pods to one foot long, used as peas. P. palustris (Desvaux) 

 is closely allied, and has shorter pods. Likely to ripen fruits also 

 outside the tropics. 



Psoralea esculenta, Pursh. 



North- America. This herb is mentioned here, as its tuberous 

 roots, known as the Prairie-Turnip, may be capable of great 

 improvement by cultivatian, and of thus becoming a valuable 

 esculent. 



Psychotria Eckloniana. F. v. Mueller. (Grumilia cymosa, E. Meyer.) 



South-Africa. Dr. Pappe describes the wood of this tree as of a 

 beautiful citron-yellow. 



Pterocarpus Indicus, Roxburgh. 



The Lingo of China and India. A tree of considerable dimensions, 

 famed for its flame-red wood. It furnishes also a kind of dragon- 

 blood-resin. 



Pterocarpns marsupiurru Roxburgh. 



India, ascending in Ceylon and the Circars to fully 3,000 feet 

 altitude ; hence this tree would doubtless grow without protection 

 in those tracts of the temperate zone, which are free from frost. 

 The tree is large when in its final development ; its foliage is 

 deciduous. It exudes the best medicinal kino, which contains 

 about 75 per cent, of tannic acid. P. santalinus (Linne fil.), which 

 provides the Saunders or Eed Sandal- Wood, is also indigenous to 

 the mountains of India and important for dye-purposes. 



Pterocarya fraxinifolia, Kunth. 



From Central Asiatic Russia to Persia. A kind of Walnut-tree, 

 which with P. stenoptera (Cas. de Candolle) on Dr. Hance's 

 recommendation should be adopted as trees for both ornament and 

 timber, and so perhaps also the Japanese species, P. rhoifolia 

 (Siebold and Zuccarini). 



