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''Potamogeton richardsonii'' is a species of aquatic plant known by the common name Richardson's pondweed. It is native to much of northern North America, including all of Canada and the northern and western United States. It grows in water bodies such as ponds, lakes, ditches, and streams. This perennial herb grows a narrow, mostly unbranched stem from a mat of rhizomes in the substrate. It reaches about a meter in maximum length. The leaves are up to 13 centimeters long and about 3 wide with crinkly pointed or rounded tips. The inflorescence is a spike of flowers arising from the water surface on a peduncle. ==External links== *(Jepson Manual Treatment ) *(USDA Plants Profile ) *(Flora of North America ) *(Washington Burke Museum ) 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「Potamogeton richardsonii」の詳細全文を読む スポンサード リンク
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