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Wilkesia gymnoxiphium
''Wilkesia gymnoxiphium'' (Hawaiian iliau), is a species of flowering plant in the sunflower family, Asteraceae, that is endemic to the island of Kauai in Hawaii. ''Wilkesia'' is one of three genera, with ''Argyroxiphium'' (silverswords and greenswords) and ''Dubautia'' (a larger group with many varied species) that are believed to be descendant from a single species related to the North American tarweed. The members of these three genera constitute what is called the silversword alliance, a group whose exceedingly close genetic heritage is not reflected in their exceptionally diverse morphologies.
==Description==
''W. gymnoxiphium'' is a monocarpic rosette shrub, with rosettes elevated on woody stems as much as tall. Distinctive features include a usually unbranched, monocarpic axis, leaves in whorls of 9-15 that join to form a basal sheath around the stem, and peduncles that are commonly branched. Fountains of yellow, daisy-like flowers form mostly May to July. When unbranched the plant dies after flowering, but if it branches into multiple heads (as may happen if the top is broken off), each head will flower and die separately.
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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