Dioscorea batatas.
Chinese Potato,
or
Japanese Yam.
Stem twelve feet or more in length, of a creeping or climbing habit; leaves heart-shaped, though sometimes halberd-formed; flowers small, in clusters, white. "The root is of a pale russet color, oblong, regularly rounded, club-shaped, exceedingly tender, easily broken, and differs from nearly all vertical roots in being largest at the lower end."
Propagation and Cultivation.—The Chinese Potato requires a very deep, light, rather sandy, and tolerably rich soil; and this should be thoroughly stirred to the depth of at least two feet. No fresh manure should be used, but fine, well-decomposed compost applied, and deeply as well as very thoroughly incorporated with the soil; avoiding however, if possible, its direct contact with the growing roots. It is propagated either by small roots; by the top or neck of the large roots, cut off to the length of five or six inches; or by the small bulbs, or tubers, which the plants produce in considerable numbers on the stem, in the axils of the leaves. These should be planted the last of April, or as soon as the ground is in good working condition. Lay out the land in raised ridges two feet and a half or three feet asunder; and on the summit set the bulbs, or tubers, with the point or shoot upwards, eight or ten inches apart; and cover about an inch deep. Cultivate in the usual manner during the summer; and late in autumn, after the tops are dead, and just before the closing-up of the ground, take up the roots, dry them a short time in the sun, and store them in the cellar for use. The roots are perfectly hardy, and will sustain no injury from the coldest winter, if left unprotected in the open ground. During the second season, the growth of the old root is not continued, but gradually decays as the new roots are formed. A well-grown root will measure about two feet in length, and two inches and a half at its broadest diameter.
Use.—The flesh is remarkably white, and very mucilaginous in its crude state. The roots are eaten either boiled or roasted, and require rather more than half the time for cooking that is usually given to the boiling or roasting of the common potato. When cooked, they possess a rice-like taste and consistency, are quite farinaceous, and unquestionably nutritive and valuable for food.