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Arisaema dracontium
''Arisaema dracontium'' (Dragon-root, Green dragon) is a herbaceous perennial plant in the genus ''Arisaema'' and the family Araceae. It is native to North America from Quebec to Minnesota south to Florida and Texas, where it is found growing in damp woods. It has also been reported from northeastern Mexico (Nuevo León + Veracruz)〔(【引用サイトリンク】title=Arisaema dracontium (Linnaeus) Schott )〕 Plants grow tall when in bloom and after flowering reach , they grow from a corm.〔''New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada'', p. 367. 〕 Normally a single leaf is produced with long petioles, the leaf is composed of 7 to 13 leaflets with the center leaflet the largest and leaflets becoming smaller as they are produced on the outside surface, the leaflets are held out horizontally over the plant. During flowering in spring a single, slender, green spathe long is produced that covers a tapering, long thin spadix. The tall like spadix grows out around the top of the spathe. After flowering, up to 150 berries are produced in a club shaped column. In late summer the green berries turn orange-red, each berry produces 1 to 3 seeds. It is listed as a vulnerable species in Canada.
==Classification==
Within the genus ''Arisaema'', ''A. dracontium'' is classified in the section ''Tortuosa'' and is most closely related to the Mexican ''A. macrophyllum''. In fact, ''A. macrophyllum'' has sometimes been considered a subspecies of ''A. dracontium''. The rest of the section contains species from east Asia and India. ''A. dracontium'' is not a close relative to the other American ''Arisaema'' species, ''A. triphyllum'' (jack-in-the-pulpit), which is in a different section of ''Arisaema''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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