. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. DIOON lanngindBom, Hort., is a very woolly kind. Gt. 48, pp. 15i> 155-—A variable species.' D. tomentbsum, once sold by Pitcher and Manda, was probably woollier than the type. D. spinulbsum, Dyer, differs mainly in having the segments margined with small sharp points. Mex. 7:461. TIT TLt W. M. DI0SC0B£A
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. DIOON lanngindBom, Hort., is a very woolly kind. Gt. 48, pp. 15i> 155-—A variable species.' D. tomentbsum, once sold by Pitcher and Manda, was probably woollier than the type. D. spinulbsum, Dyer, differs mainly in having the segments margined with small sharp points. Mex. 7:461. TIT TLt W. M. DI0SC0B£A (Didscorides, the Greek naturalist). BioscoreAcew. The type genus of a small family (of about 8 genera) allied to Liliaceae. It contains upwards of 150 widely dispersed and confused species, most of them native to tropical regions. Stems herbaceous and twining or long-procumbent, usually from a large tuber- ous root, and sometimes bearing tubers in the axils. Lvs. broad, ribbed and netted-veined, petiolate, alternate or opposite, sometimes compovmd. Dioecious. Fls. small; calyx6-parted, anthers 6; styles3, ovary 3-loculed and calyx adherent to it. Fr. a 3-winged capsule. Seeds winged. The great subterranean tubers of some species are eaten in the manner of potatoes. For an inquiry into the prehistoric cultivation of Dioscoreas in America, see Gray & Trumbull, Amer. Joum. Sci. 25:250. A, Stems strongly winged. alftta, Linn. Fig. 714. Stem 4-wtngedorangular: lvs. opposite, cordate-oblong or cordate-ovate, with a deep, basal sinus, glabrous, devoid of pellucid dots, 7- nerved (sometimes 9-nerved), with the outer pair united: stamiuate spikes compound, special ones whorled, short, flexuose : pistillate spikes simple : fls. distant, anthers subglobose, about as long as the filament: capsule leathery, elliptical. India and the S. Sea Islands. —Widely cult, in the tropics under many vernacular names. Tubers reach a length of 6-8 ft., and some- times weigh 100 lbs.; edible. T
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