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Carex aboriginum : ウィキペディア英語版 | Carex aboriginum
''Carex aboriginum'' is a species of sedge endemic to Idaho in the western United States, known as Indian Valley sedge. It was not observed in the wild between 1910, when it was first described, and 1999. Until its rediscovery, ''C. aboriginum'' was considered the only plant native to Idaho to have become extinct, and it remains one of the state's rarest and most endangered plant species. ==Description== ''Carex aboriginum'' grows in tussocks around tall, with linear leaves about wide. It produces inflorescences comprising 1–3 pistillate (female) spikes, and a terminal spike which is either staminate (male) or gynecandrous (male at the base and female towards the tip). Each spike is typically long and wide.
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