Naturalisation in Extra-Tropical Countries. 345 



Oxalis crenata, Jacquin. 



Peru and Bolivia. There the tubers largely consumed ; they lose 

 their acidity by being exposed to the sun, becoming sweet, and con- 

 tain a good deal of starch [Vilmorin] . 



Oxalis Deppei, Loddiges. 



Mexico. The tubers of this Wood-Sorrel resemble small parsnips, 

 ;md are not at all acid. The plant undergoes regular cultivation in 

 some parts of its native country, and succeeds well in the south of 

 England [Chambers]. In Prof. Meehan's " Gardener's Monthly," 

 August, 1884, an Oxalis is mentioned as cultivated in California 

 which produced from one original root as much as 150 tubers in a 

 season, their form being pear-like. 



Oxalis esculenta, Otto and Dietrich. 



" Spurious Aracacha." Mexico, there, with the preceding species 

 and O. tetraphylla (Cavanilles), O. violacea (Linne) and several 

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

 tioned gives the largest yield. Propagated by subdivision of the 

 root-stock or bulbilles. It requires a deep, rich, moist soil. In 

 Norway it can be grown to lat. 70 [Schuebeler]. As similarly 

 useful may be noted, among many others, O. enneaphylla (Cavanilles) 

 from the Falkland-Islands and Magelhaen's Straits, 



Oxytropis pilosa, De Candolle. (Astragalus ptfosus, Linne.) 



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

 herbage ; it is deep-rooted and content with almost absolute sand ; 

 the numerous other species 24 alone enumerated as Oriental by 

 Boissier should be tested. All these plants might be classed as 

 Astragals. They as a rule are satisfied with poor soil. 



Pachyma Cocos, Fries. 



The Tuckahoe-Truffle or Indian Bread. North-America and 

 East-Asia. 



Pachyma Hcelen, Fries. 



China. This large truffle occurs particularly in the province of 

 Souchong. Flavor most agreeable. Naturalisation elsewhere to be 

 tried. 



\ 

 Pachyrrhizus angulatus, Richard.* (Dolichos bulbosus, Lamarck.) 



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. Dr. Peckolt records 

 tubers of 70 Ibs. weight. They keep in dry ground, growing for five 

 years, but such are then available only for starch, whereas annual 



