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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 Puccinellia howellii ： ウィキペディア英語版 Puccinellia howellii ''Puccinellia howellii'' is a rare species of grass known by the common name Howell's alkaligrass. It is endemic to Shasta County, California, where it is known from a single population in Whiskeytown National Recreation Area near Whiskeytown. Its entire population is contained in a complex of three saline mineral springs directly next to Highway 299.〔Cooper, D. J. and E. C. Wolf. (2007). (A restoration and monitoring plan for ''Puccinellia howellii'', Whiskeytown National Recreation Area, California. ) Colorado State University.〕 The grass was first described to science in 1990〔Davis, J. I. (1990). ''Puccinellia howellii'' (Poaceae), a new species from California. ''Madroño''. 37:1 55-58.〕 and no other populations were discovered despite extensive searches of the area.〔(Center for Plant Conservation )〕 ==Description== ''Puccinellia howellii'' is perennial bunchgrass, and grows in clumpy monotypic stands of stems up to 60 centimeters tall. The inflorescence is an array of branches a few centimeters long, the lower ones reflexed as the fruit matures. The grass reproduces only by seed, and seed is not produced until the individual is two years old or more.〔 The plants are mostly dormant during warm months when the soil salinity is highest, and the seed germinates during wet seasons when water flow dilutes the salt.〔 The single population of the grass is made up of several thousand individuals, a dominant species of the vegetation in this tiny network of mineral springs.〔〔(Grass Manual Treatment )〕 It grows alongside other halophytes such as saltgrass (''Distichlis spicata'') and seaside arrowgrass (''Triglochin maritima'').〔 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「Puccinellia howellii」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.