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Rayjacksonia aurea
''Rayjacksonia aurea'' is a species of flowering plant in the aster family known by the common names Houston tansyaster and Houston camphor daisy. It is endemic to Texas in the United States, where it is known only from the Houston area. It is limited to Galveston and Harris Counties.〔(''Machaeranthera aurea''. ) The Nature Conservancy.〕〔(''Rayjacksonia aurea''. ) Center for Plant Conservation.〕
This species is an annual herb which generally remains small in its native habitat but in cultivation may be much larger.〔 It grows from a taproot. The small leaves are linear or lance-shaped and just a few millimeters wide. The flower heads contain several yellow ray florets which may reach nearly a centimeter in length.〔(''Rayjacksonia aurea''. ) Flora of North America.〕 The plant has a scent like camphor. Flowering occurs in October and November.〔
This plant grows on the Texas coastal prairie, especially on Mima mounds. The plant may occur with other rare local endemics, such as Texas windmill grass. There are fewer than 20 populations.〔
The species and its habitat are threatened by development and expansion of the Houston metropolitan area.〔
==References==
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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