Current I investigations 
Cultivated for more than 2000 years. 
Starch Plants. 
Potato. 
Sweet Potato ( Ipomcea 
Batatas) 
Yams (Dioscorca spp.J. 
Cassava (Mauihot utilissima). 
Colocasia antiquorum. 
Bread Fruit (Artocarpus (incis 
Legumes. 
Garden Pea (Pisum sativum). 
Bean. Lentil. 
Ground Nut (AracJiis hypogea) 
Fruits. 
Banana. 
Date. 
Fig. 
Vine. 
Apple. 
Plum. 
Sugar Plants. 
Sugar cane. 
Dye Plants. 
Indigo. 
Madder. 
Henna (Lawsonia alba) 
Saffron. 
Medicinal Plants, 
, ETC. 
Hemp. 
Tobacco. 
Coca. 
Tea. 
in Economic Botany. 77 
Cultivated for less than 2000 years. 
)• 
Field Pea (Pisum arvense). 
Pigeon Pea (Cajanus indicus). 
Orange. Raspberry. 
Strawberry. Melon. 
Gooseberry. Currants. 
Sugar-beet. 
Coffee. 
Cinchona. 
Rubber Plants, etc. 
Fodder Plants. 
Fibre Plants. 
Flax (Linum usitatissimum). 
Hemp (Cannabis sativa). 
Cotton (Gossypium spp.). 
Ceara Rubber (Manihot 
Glaziovii). 
Para Rubber (Hevea 
brazil iensis). 
Central American Rubber 
(Castilloa elastica). 
Lagos Silk Rubber (Funtumia 
elastica). 
Asam Rubber (Ficus elastica ), 
Gutta Percha Tree (Dichopsis 
Gutta.) 
The Hay Grasses of temper¬ 
ate climates and species of 
Trifolium and Medicago 
Guinea Grass (Panicnm 
maximum). 
Sour Grass, West Indies, 
(Andropogon pertusus), etc. 
Sisal Hemp (Agave rigida var. 
sisalana.) 
New Zealand Hemp 
(Phormium Tenax). 
This table might be considerably extended, but as it stands it 
suffices to demonstrate that all the principal cultivated food plants 
