|
''Ambrosia psilostachya'' is a species of ragweed known by the common names Cuman ragweed, perennial ragweed, and western ragweed. It is widespread across much of North America (United States, Canada, and northern Mexico).〔(Biota of North America Program 2104 county distribution map )〕 It is also naturalized in parts of Europe, Asia, Australia, and South America.〔(United States Department of Agriculture Plants Profile ) . accessed 2.14.2013〕 It is a common plant in many habitat types, including disturbed areas such as roadsides.〔(Flora of North America Vol. 21 Page 18 ''Ambrosia psilostachya'' de Candolle in A. P. de Candolle and A. L. P. P. de Candolle )〕〔(Flora of China Vol. 20-21 Page 877 裸穗豚草 luo sui tun cao ''Ambrosia psilostachya'' Candolle )〕〔(Tropicos, specimen listing for ''Ambrosia psilostachya'' DC )〕〔(Altervista Flora Italiana, Ambrosia con spighe rade, ''Ambrosia psilostachya'' DC. ) includes photos and European distribution map〕〔(Atlas of Living Australia, ''Ambrosia psilostachya'' DC. Perennial Ragweed )〕 ==Description== ''Ambrosia psilostachya'' is an erect perennial herb growing a slender, branching, straw-colored stem to a maximum height near two meters, but more often remaining under one meter tall. Leaves are up to 12 centimeters long and vary in shape from lance-shaped to nearly oval, and they are divided into many narrow, pointed lobes. The stem and leaves are hairy.〔 The top of the stem is occupied by an inflorescence which is usually a spike. The species is monoecious, and the inflorescence is composed of staminate (male) flower heads with the pistillate heads located below and in the axils of leaves.〔 The pistillate heads yield fruits which are achenes located within oval-shaped greenish-brown burs about half a centimeter long. The burs are hairy and sometimes spiny. The plant reproduces by seed and by sprouting up from a creeping rhizome-like root system. This plant blooms from midsummer to autumn. ;Medicinal uses This plant had a number of medicinal uses among several different Native American tribes, including the Cheyenne, Kumeyaay (Diegueno), and Kiowa people. 〔( University of Michigan - Dearborn; Native American Ethnobotany — ''Ambrosia psilostachya'' ) . accessed 2.14.2013〕 It contains a biologically active phytochemical called Psilostachyin. 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「Ambrosia psilostachya」の詳細全文を読む スポンサード リンク
|
