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. 
Ipomoea 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. 
Ipomoea simulaus, Hanbury. 
Mexico. Erom this species the Tampico Jalap), or rather 
the Sierra Gorda Jalap, is derived. I. operciilata, 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. Erom the Mediterranean regions througli 
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 grandiflomm, B- 
From India to Japian. 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 
obtainable. 
