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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Plagiobothrys hirtus ： ウィキペディア英語版 Plagiobothrys hirtus ''Plagiobothrys hirtus'', the rough popcornflower, is a plant species with only about a dozen reportedly extant occurrences, all within the Umpqua River watershed in Douglas County, Oregon.〔Amsberry, K. and R.J. Meinke. Recovering ''Plagiobothrys hirtus'' through creation of new populations in protected sites – 2009 section 6 project proposal. Proposal submitted to U.S. Fish and Wildlife Service, Portland, Oregon. Native Plant Conservation Program, Oregon Department of Agriculture, Salem, Oregon.〕 It is federally listed endangered in the United States of America. In fact ''P. hirtus'' is now considered to be one of the top three most endangered vascular plant species in the Northwest. The state of Oregon has ranked this plant as its number one recovery priority due to its high degree of threat as well as its high rating in recovery potential.〔(【引用サイトリンク】United States Fish and Wildlife Service"> date=July 28, 2003 )〕 Its recovery depends on conservation of existing populations as well as reintroduction of new populations in protected and species-appropriate areas. The habitats most suitable for ''P. hirtus'' are seasonal wetlands, which are inundated with water from late fall until spring, but may dry out in summer. However, development, agriculture, and fire suppression have all played a role in the alteration and elimination of much of this species’ habitat. After overwintering submerged in water, this facultatively perennial herb bears a basal rosette of leaves which gives rise to a hairy flowering stalk that can be up to 70 cm tall. These stalks bear spirals of white and yellow inflorescences of five-petaled flowers. The flowers are self-compatible, but need insects to achieve pollination and significant seed set, and can produce up to four tan- to black-colored, one-seeded nutlets. Recruitment is highly viable in the greenhouse, with a 65 to 95 percent germination rate, and cultivated plants transplant well into the field.〔Amsberry, K. 2001. Conservation biology of ''Plagiobothrys hirtus'' (''Boraginaceae''): Evaluation of life history and population enhancement. M.Sc. Oregon State University: Corvallis, Oregon.〕 These two – high viability and prolific growth after transplanting—are what make the reintroduction of the species so promising.〔 Reintroduced populations of ''P. hirtus'' established by the Oregon Department of Agriculture have been thriving for sixteen years. To date, reintroductions projects have been successful in augmenting existing and creating new populations of the species, with plants persisting since the initial 1998 reintroductions.〔Amsberry, K., and R.J. Meinke. ''Plagiobothrys hirtus'' Reintroduction project and population monitoring: 2009 final report. Report prepared for Bureau of Land Management〕 During this time, information has also been gathered concerning the life history and establishment ecology of the species. Under careful monitoring and management, this species now has an excellent chance to be self-sustaining in the future, assuming additional populations can be established on administratively protected lands. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plagiobothrys hirtus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.