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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 Isoetes louisianensis ： ウィキペディア英語版 Isoetes louisianensis The Louisiana quillwort (''Isoetes louisianensis'') is a small, grass-like aquatic plant of the family Isoetaceae. It is "one of the rarest quillworts in North America."〔(''I. louisianensis''. ) Center for Plant Conservation.〕 It occurs in only five locations in St. Tammany and Washington Parishes of Louisiana and some spots in southern Mississippi (USA). It is federally listed as an endangered species, partly due to its highly restricted range.〔USFWS. (Determination of Endangered Status for the Plant ''Isoetes louisianensis'' (Louisiana Quillwort). ) ''Federal Register'' October 28, 1992.〕 The Louisiana Quillwort occurs predominantly on sand and gravel bars on small to medium-sized streams. These plants live for periods underwater. They are regularly inundated as much as 50 centimeters (20 inches) following rains, and may be inundated for long periods in wet seasons. Its habitat follows roughly along the Bogue Chitto River. Associated plants include primrose-leafed violet (''Viola primulifolia''), bulrush (''Scirpus divaricatus''), water-willow (''Justicia lanceolata''), yellow-star grass (''Hypoxis leptocarpa''), yellow-eyed grass ''Xyris'' sp. and sedge (''Carex'' sp.), swamp tupelo (''Nyssa sylvatica'' var. ''biflora''), water tupelo (''Nyssa aquatica''), sweetbay (''Magnolia virginiana''), bald cypress (''Taxodium distichum''), swamp laurel oak (''Quercus obtusa''), red maple (''Acer rubrum''), loblolly (''Pinus taeda''), ti ti (''Cyrilla racemiflora''), fetterbush (''Lyonia lucida''), and winterberry (''Ilex verticillata'').〔 Distinctive characteristics of this species include brown-spotted sporangial walls and megaspores with highly reticulate ridges, producing a spiny effect. The leaves are up to 40 cm long. The Louisiana quillwort was described recently, in 1973, and was listed as an endangered species in 1992.〔 ==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「Isoetes louisianensis」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.