Order XLIII.—Chenopodiaceæ: Herb; eighty genera.
Beta (beet): Europe and western Asia. Cultivated in Europe, west Africa, temperate British India, North America.
Spinacia (spinach): Annual. Persia. Cultivated in middle of North Temperate Zone, from Hindustan to western shores and islands of Europe, eastern United States of North America, South Pacific Islands.
Order XLIV.—Polygonaceæ: Herb; thirty genera.
Fagopyrum (buckwheat): Central Asia and Tartary, Russia. Cultivated in Canada, northern United States, northern and central Europe.
Rheum (rhubarb): Perennial. Tartary. Cultivated as far north as fiftieth parallel, China, especially in provinces of Shensi, Kansu, and Szechuen.
Order XLV.—Piperaceæ: Shrub; eight genera.
Piper (pepper): Southern Asia. Cultivated in southern India, Java, Sumatra, and Malabar.
Order XLVI.—Myristicaceæ: Trees, shrubs; one genus.