Manihot (tapioca): Tropical and sub-tropical South America. Cultivated in southern Asia and western Africa.
Ricinus (castor-oil plant): Annual. Southern Asia, eastern Africa. Cultivated in Japan, Bengal, eastern and northern Africa, southern Europe and United States, especially Kansas.
Order L.—Urticaceæ: Trees, shrubs, herbs; one hundred and eight genera.
Cannabis (hemp): Annual. Chinese Tartary, northern India, southwestern Siberia. Cultivated in China, Japan, Persia, Hindustan, Egypt, southern Africa, Russia, European states, Canada, United States.
Ficus (fig): Tree. Subtropical. Western Asia. Cultivated through Mediterranean countries west to Canary Isles.
Humulus (hop): Perennial herb. Middle Europe, Siberia, Levant, Asia Minor, Japan, North America, foot-hills of Rocky Mountains, and along upper Arkansas River, Missouri and Mississippi Rivers, Lake Winnipeg, North Atlantic States. Cultivated in Egypt.
Morus (mulberry): Tree. Cultivated in western New England, southern upper Canada, Dakotas, Kansas and the South. White mulberry is a native of China and Japan. Cultivated in Italy, Greece, Asia Minor, Armenia.
Ulmus (elm): Tree. From Mediterranean countries to the middle of European Russia, from southern banks of St. Lawrence River to Gulf of Mexico, and westerly to foot-hills of Rocky Mountains.
Order LI.—Juglandaceæ: Trees; five genera.
Juglans (butternut): Northeastern North Africa. Cultivated in middle Europe and England.