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Packera werneriifolia
''Packera werneriifolia'', known by the common names alpine rock butterweed and hoary groundsel, is a species of flowering plant in the aster family. It is native to the western United States in the Sierra Nevada mountain habitat in subalpine and alpine climates, including forests and barren talus.
==Description==
It is a perennial herb which is usually small but is otherwise variable in appearance. It grows up to about 15 centimeters tall from a basal rosette of thick, linear or oval leaves a few centimeters long; leaf morphology varies from the western to the eastern regions of the plant's range. The basal leaves are woolly, white to greenish and tufted with smooth and nearly entire (smooth edged) leaf margins and multiple , nearly leafless stems bearing 1-6 flower heads.
The inflorescence bears a single flower head or a cluster of a few heads and may be nearly hairless to quite woolly. The flower head contains up to 40 yellow disc florets, and usually either 8 or 13 yellow ray florets, though these are sometimes absent. It blooms in July to August.〔
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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