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''Diospyros virginiana'' is a persimmon species commonly called the American persimmon,〔 common persimmon,〔(USDA PLANTS database )〕 eastern persimmon, "'simmon", "possumwood", or "sugar-plum". It ranges from southern Connecticut/Long Island to Florida, and west to Texas, Louisiana, Oklahoma, Kansas, and Iowa. The tree grows wild but has been cultivated for its fruit and wood since prehistoric times by Native Americans. ''Diospyros virginiana'' grows through , in well-drained soil. In summer, this species produces fragrant flowers which are dioecious, so one must have both male and female plants to obtain fruit. Most cultivars are parthenocarpic (setting seedless fruit without pollination). The flowers are pollinated by insects and wind. Fruiting typically begins when the tree is about 6 years old. The fruit is round or oval and usually orange-yellow and sometimes bluish and from 2 through 6 cm (0.79 through 2.4 in) in diameter. In the U.S. South and Midwest, the fruits are referred to as simply persimmons or "'simmons", and are popular in desserts and cuisine. Commercial varieties include the very productive Early Golden, the productive John Rick, Miller, Woolbright and the Ennis, a seedless variety. Another nickname of the American persimmon, 'date-plum' also refers to a persimmon species found in South Asia, ''Diospyros lotus''. ==Description== It is a small tree usually 30 through 80 feet (10 through 24 meters) in height, with a short, slender trunk and spreading, often pendulous branches, which form a broad or narrow, round-topped canopy. The roots are thick, fleshy and stoloniferous. This species as has a shrubby growth form. This plant has oval entire leaves, and unisexual flowers on short stalks. In the male flowers, which are numerous, the stamens are sixteen in number and arranged in pairs; the female flowers are solitary, with traces of stamens, and a smooth ovary with one ovule in each of the eight cells—the ovary is surmounted by four styles, which are hairy at the base. The fruit-stalk is very short, bearing a subglobose fruit an inch in diameter or a bit larger, of an orange-yellow color, ranging to bluish, and with a sweetish astringent pulp. It is surrounded at the base by the persistent calyx-lobes, which increase in size as the fruit ripens. The astringency renders the fruit somewhat unpalatable, but after it has been subjected to the action of frost, or has become partially rotted or "bletted" like a medlar, its flavor is improved. * Bark: Dark brown or dark gray, deeply divided into plates whose surface is scaly. Branchlets slender, zigzag, with thick pith or large pith cavity; at first light reddish brown and pubescent. They vary in color from light brown to ashy gray and finally become reddish brown, the bark somewhat broken by longitudinal fissures. Astringent and bitter. * Wood: Very dark; sapwood yellowish white; heavy, hard, strong and very close grained. Specific gravity, 0.7908; weight of cubic foot, . The heartwood is a true ebony. Forestry texts indicate that about a century of growth is required before a tree will produce a commercially viable yield of ebony wood. * Winter buds: Ovate, acute, one-eighth of an inch long, covered with thick reddish or purple scales. These scales are sometimes persistent at the base of the branchlets. * Leaves: Alternate, simple, four to six inches (152 mm) long, oval, narrowed or rounded or cordate at base, entire, acute or acuminate. They come out of the bud revolute, thin, pale, reddish green, downy with ciliate margins, when full grown are thick, dark green, shining above, pale and often pubescent beneath. In autumn they sometimes turn orange or scarlet, sometimes fall without change of color. Midrib broad and flat, primary veins opposite and conspicuous. Petioles stout, pubescent, one-half to an inch in length. * Flowers: May, June, when leaves are half-grown; diœcious or rarely polygamous. Staminate flowers borne in two to three-flowered cymes; the pedicels downy and bearing two minute bracts. Pistillate flowers solitary, usually on separate trees, their pedicels short, recurved, and bearing two bractlets. * Calyx: Usually four-lobed, accrescent under the fruit. * Corolla: Greenish yellow or creamy white, tubular, four-lobed; lobes imbricate in bud. * Stamens: Sixteen, inserted on the corolla, in staminate flowers in two rows. Filaments short, slender, slightly hairy; anthers oblong, introrse, two-celled, cells opening longitudinally. In pistillate flowers the stamens are eight with aborted anthers, rarely these stamens are perfect. * Pistil: Ovary superior, conical, ultimately eight-celled; styles four, slender, spreading; stigma two-lobed. * Fruit: A juicy berry containing one to eight seeds, crowned with the remnants of the style and seated in the enlarged calyx; depressed-globular, pale orange color, often red-cheeked; with slight bloom, turning yellowish brown after freezing. Flesh astringent while green, sweet and luscious when ripe.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diospyros virginiana」の詳細全文を読む スポンサード リンク
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