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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 Sisyrinchium sarmentosum ： ウィキペディア英語版 Sisyrinchium sarmentosum ''Sisyrinchium sarmentosum'' is a species of flowering plant in the iris family known by the common names mountain blue-eyed grass and pale blue-eyed-grass. It is native to the Pacific Northwest of North America, where it is known from a part of the Cascade Mountains in Washington and Oregon.〔(''Sisyrinchium sarmentosum''. ) The Nature Conservancy.〕 This perennial herb grows up to 32 centimeters tall. The grasslike leaves, located around the base of the plant, are linear in shape and up to 20 centimeters long. Each flower has six pale blue tepals with yellow bases. They are a centimeter long or slightly longer. Each has a rounded tip with a bristle in the center. The fruit is a rounded brown capsule half a centimeter long.〔(''Sisyrinchium sarmentosum''. ) Flora of North America.〕〔(''Sisyrinchium sarmentosum''. ) Washington Burke Museum.〕 Flowering occurs in June at lower elevations and July at higher. The flowers open in late morning or mid-day.〔(''Sisyrinchium sarmentosum''. ) Center for Plant Conservation.〕 This plant grows in mountain meadows in southern Washington and northern Oregon. Most of the 22 known populations are found within the Gifford Pinchot and Mt. Hood National Forests.〔(''Sisyrinchium sarmentosum''. ) USDA Forest Service: Celebrating Wildflowers.〕 The plants occur at elevations within the Pacific silver fir and grand fir zones.〔〔 The habitat is usually wet, and snowy during the winter. The meadows are surrounded by conifers and meadow species may include ''Deschampsia cespitosa'', ''Alopecurus pratensis'', ''Phleum pratense'', ''Poa palustris'', ''Juncus tenuis'', ''Juncus ensifolius'', ''Carex vesicaria'', ''Carex microptera'', ''Agrostis idahoensis'', ''Fragaria virginiana'' var. ''platypetala'', ''Prunella vulgaris'', ''Trifolium repens'', ''Potentilla drummondii'', ''Ranunculus flammula'', ''Solidago canadensis'', ''Veronica scutellata'', ''Botrychium multifidum'', ''Antennaria microphylla'' and ''Viola adunca''.〔 This plant reproduces sexually and by cloning. Grazing by cattle reduces the plant's ability to reproduce by seed, so cloning is often more common. This tends to reduce the genetic diversity of populations, so grazing is a major threat to the species.〔 At least 82% of all the plants are located on one grazing allotment on the Gifford Pinchot National Forest.〔(Conservation agreement for pale blue eyed grass (''Sisyrinchium sarmentosum''), in Oregon and Washington. ) Gifford Pinchot, Mt. Hood, and Okanogan-Wenatchee National Forests.〕 Fire suppression is another threat. When the natural fire regime is prevented, large and woody vegetation encroaches on the plant's meadow habitat, producing competition and shade. Invasive species of plants are a threat, including ''Cynoglossum officinale'', ''Senecio jacobaea'', ''Cirsium arvense'', and ''Cirsium vulgare''. Other threats include recreation, hybridization with ''Sisyrinchium idahoense'', and logging.〔 ==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「Sisyrinchium sarmentosum」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.