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Howellia
''Howellia aquatilis'' (water howellia) is a small plant in the family Campanulaceae and is considered to a threatened species since 1994. It is the only species in the monotypic genus ''Howellia''.〔(Center for Plant Conservation. )〕 Thomas Jefferson Howell and Joseph Howell discovered the species in 1878.
==Distribution==
The water howellia is found in large area of the Pacific Northwest region of the United States. It can be found in California, Idaho, Montana, and Washington, and it is known historically from Oregon.〔(USFWS Species Profile. )〕
The plant grows in wetland habitat surrounded by forests, which provide organic material.〔 Associated tree species include ''Populus trichocarpa'' (California poplar), ''P. tremuloides'' (quaking aspen), and ''Fraxinus latifolia'' (Oregon ash).〔 The water bodies are located in glacial potholes, river oxbows, ephemeral ponds, flood plains and other areas that fill with water periodically as snow melts and spring rain falls.〔
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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