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Mauna Kea silversword
The Mauna Kea silversword, ''Argyroxiphium sandwicense'' subsp. ''sandwicense'', is a highly endangered flowering plant endemic to the island of Hawaiʻi (''Big Island'') of Hawaii. It is the "crown jewel"〔 of the volcanic mountain Mauna Kea, from which it derives its English name. The Hawaiian name is ahinahina; it applies to silverswords more broadly. The Mauna Kea silversword was once common on the volcano, and extraordinary conservation efforts are being made to preserve the species.〔〔
==Silverswords — ''Argyroxiphium''==
Closely related to the Haleakala silversword (''Argyroxiphium sandwicense'' subsp. ''macrocephalum'') and in the family Asteraceae, the Mauna Kea silversword is a member of the silversword alliance, a group of approximately 50 species in three genera, all endemic to the Hawaiian islands. Their diverse morphologies belie extremely close genetic kinship and suggest extremely rapid evolution from a single precursor species.〔 The silversword alliance is considered the most dramatic example of adaptive radiation among plants in Hawaii, illustrating the role of isolation and distinctive ecological conditions in promoting evolution.〔
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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