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The tulip is a Eurasian and North African genus of perennial, bulbous plants in the lily family.〔 It is an herbaceous herb with showy flowers, of which around 75 wild species are currently accepted. The genus's native range extends west to the Iberian Peninsula, through North Africa to Greece, the Balkans, Turkey, throughout the Levant (Syria, Israel, Palestinian Territories, Lebanon, Jordan) and Iran, north to Ukraine, southern Siberia and Mongolia, and east to the Northwest of China.〔(Kew World Checklist of Selected Plant Families )〕〔 The tulip's centre of diversity is in the Pamir, Hindu Kush, and Tien Shan mountains. It is a common element of steppe and winter-rain Mediterranean vegetation. A number of species and many hybrid cultivars are grown in gardens or as potted plants. ==Description== Tulips are spring-blooming perennials that grow from bulbs. Depending on the species, tulip plants can be between and high. The tulip's large flowers usually bloom on scapes with leaves in a rosette at ground level and a single flowering stalk arising from amongst the leaves.Tulip stems have few leaves. Larger species tend to have multiple leaves. Plants typically have two to six leaves, some species up to 12. The tulip's leaf is strap-shaped, with a waxy coating, and the leaves are alternately arranged on the stem; these fleshy blades are often bluish green in color. Most tulips produce only one flower per stem, but a few species bear multiple flowers on their scapes (e.g. ''Tulipa turkestanica''). The generally cup or star-shaped tulip flower has three petals and three sepals, which are often termed tepals because they are nearly identical. These six tepals are often marked on the interior surface near the bases with darker colorings. Tulip flowers come in a wide variety of colors, except pure blue (several tulips with "blue" in the name have a faint violet hue).〔King, p.164〕 The flowers have six distinct, basifixed stamens with filaments shorter than the tepals. Each stigma has three distinct lobes, and the ovaries are superior, with three chambers. The tulip's seed is a capsule with a leathery covering and an ellipsoid to globe shape. Each capsule contains numerous flat, disc-shaped seeds in two rows per chamber.〔Flora of North America Editorial Committee. 2002. ''Flora of North America''. North of Mexico Vol. 26, orchidales.'' New York: Oxford University Press. Page 199〕 These light to dark brown seeds have very thin seed coats and endosperm that does not normally fill the entire seed. 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「tulip」の詳細全文を読む スポンサード リンク
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