210 SELECT PLANTS FOR INDUSTRIAL CULTURE 



other implements, for mill-cogs, wheels, etc. Cattle browse 

 on the foliage. The growth of the tree is very slow. 



Oxalis crassicaulis, Zuccarini. 



Peru. This seems one of the best of those Wood Sorrels which 

 yield a tuberous edible root. Amongst others, O. tuberosa 

 (Mol.) and O. succulenta (Bam.) from Chili, as well as 0. 

 . earnosa (Mol.) and 0. conorrhiza (Jacq.) from Paraguay, 

 might be tried for their tubers. 



Oxalis esculenta, Otto and Dietrich. 



Spurious Aracacha. Mexico, there with 0. tetraphylla (Cava- 

 nilles), 0. Deppei (Loddiges), O. violacea (Linne), and several 

 others, producing tuberous, starchy, wholesome roots ; the first 

 mentioned gives the largest yield. Propagated by subdivision 

 of the root stock. It requires a deep, rich, moist soil. As 

 similarly useful may be mentioned among many others, 0. 

 crenata (Jacquin) from Chili and O. enneaphylla (Cavanilles) 

 from the Falkland Islands and Magelhaen's Straits. 



Oxytenanthera Thwaitesii, Munro. 



Ceylon, on mountains from 4,000 to 6,000 feet high. A 

 dwai-f but handsome Bamboo, reaching only a height of 12 

 feet. 



Oxytropis pilosa, CandoUe. {Astragalus pilosiia, Linn^.) 



Europe, West Asia. This perennial plant furnishes fair pas- 

 ture herbage ; it is deep-rooted, content with almost absolute 

 sand ; the numerous other species — twenty-four alone enumer- 

 ated as Oriental by Boissier — should be tested. All these plants 

 might be classed as Astragals. They are mostly content with 

 poor soil. 



Pachyma Cocos, Pries. 



North America and East Asia. The hard Tuekahoe TruflSe. 



Pachyma Hoelen, Fries. 



China. This large Truffle occurs particularly in the province 

 of Souchong. Flavour most agreeable. 



Pachyrrhizus angulatus, Richard. 



From Central America, rendered spontaneous in many tropical 

 countries. A climber, the horizontal starchy roots of which 

 attain a length of 8 feet and a thickness of many inches. It 



