313 



Each tuber weighs generally from 3 lbs, to 5 lbs., but may 

 occasionally attain to 56 lbs. The yield is from 200 to 300 

 bushels from an acre. 



Ipomcea paniculata, R. Brown. 



Almost a cosmopolitan plant on tropical coasts ; thus indi- 

 genous to North Australia and the warmer parts of East 

 Australia. The tubers also of this species are edible. If 

 hardy, the plant would deserve cultivation. 



Ipomcea purga, Wenderoth. 



Mountains of Mexico. The true Jalap. This species 

 yields the medicinal Jalap root. It has recently been cul- 

 tivated with apparent success even at New York. Thus it 

 is entitled to a trial in our warm woodlands. Active prin- 

 ciple : the resinous Convolvulin. 



Ipomcea simnlans, Hanbury. 



Mexico. From this species the Tampico Jalap, or rather 

 the Sierra G-orda Jalap, is derived. I. operculata, Mart., 

 yields the Brazilian Jalap. 



Isatis indigotica, Fortune. 



North China. Perennial, almost shrubby. The use is 

 similar to that of the following plant. 



Isatis tinctoria, B. 



Dyer's Woad. From the Mediterranean regions through 

 part of the Orient, apparently extending as far as Japan. 

 A tall herb of two years' duration. The blue dye is obtained 

 from the fermented leaves. Many other species of Isatis, 

 mostly Asiatic, may produce perhaps dye with equal advan- 

 tage. Boissier enumerates merely as Oriental 28 kinds. 



Jasminum grandifiorum, B. 



From India to Japan. Flowers white. Extensively 

 cultivated in South Europe. The delicate scent is with- 

 drawn either by fixed oils or alcoholic distillation. The 

 pecuniary yield obtainable from Jasmin cultivation seems 

 vastly over-rated, even if inexpensive labour should be 

 obtai liable. 



