Juglans is confined to temperate North America, the West Indies, South America from Venezuela to Peru, western and northern China, Korea, Manchuria, Japan, and Formosa. Eleven species are known. Of exotic species _Juglans regia_ L., an inhabitant probably originally of China, is cultivated in the middle Atlantic and southern states and largely in California for its edible nuts, which are an important article of commerce. The wood of several species is valued for the interior finish of houses and for furniture. _Juglans_, from Jupiter and glands, is the classical name of the Walnut-tree. CONSPECTUS OF THE NORTH AMERICAN SPECIES. Fruit racemose; nut 4-ribbed at the sutures with smaller intermediate ribs, 2-celled at the base; heartwood light brown; leaflets 11—17, oblong-lanceolate. 1. J. cinerea (A, C). Fruit usually solitary or in pairs; nut without sutural ribs, 4-celled at the base; heartwood dark brown. Nuts prominently and irregularly ridged with often interrupted ridges; leaflets 15—23, ovate-lanceolate. 2. J. nigra (A, C). Nuts more or less deeply longitudinally grooved. Nuts up to 1½′ in diameter; leaflets 9—13, rarely 19, oblong-lanceolate to ovate, acuminate, coarsely serrate. 3. J. major (F, H). Nuts not more than ¾′ in diameter. Leaflets 17—23, narrow-lanceolate, long-pointed. 4. J. rupestris (C). Leaflets 11—15 or rarely 19, oblong-lanceolate, acute or acuminate, the lower often rounded at the apex. 5. J. californica (G). Nuts obscurely or not at all grooved, up to 2′ in diameter; leaflets 15—19, ovate-lanceolate to lanceolate, long-pointed. 6. J. Hindsii (G). 1. Juglans cinerea L. Butternut. [Illustration: Fig. 163]