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''Hilaria rigida'' (formerly ''Pleuraphis rigida''〔Mojave Desert Wildflowers, Pam MacKay, 2nd. Ed 2013, p. 314〕) is a species of clumping perennial grass that is widespread in California deserts.〔''Hilaria rigida'', CalFlora Database, (CalFlora Database: ''Hilaria rigida'' (big galleta) )〕 It is commonly known as big galleta.〔Jepson Desert Manual, Hickman, Ornduff, Constance, 2002, p. 592–593〕〔''Mojave Desert Wildflowers'', Pam MacKay, 2nd. Ed 2013, p. 285〕〔''Introduction to California Desert Wildflowers'', Philip A. Munz, revised 2004, p. 70〕〔''Plants of the East Mojave'', Adrienne Knute, revised ed. 2002, p. 55〕 It is a monocot in the ''Hilaria'' genus of the grass family (Poaceae).〔 It can be recognized after seed dispersal by the wiry, wavy inflorescence stalks (flexuose) that continue to stick out of the clump of leaf blades.〔〔 The stems are unusual among grasses in that they are solid, even between the nodes, whereas most grasses have hollow stems.〔 The clumps help stabilize sand dunes.〔〔 According to botanist Philip A. Munz, ''"it is said to be one of the most valuable forage grasses of the desert"''.〔 Clumps can live more than 100 years.〔 ==Habitat, range, and distribution== Big galleta is found in sand dunes, bajadas, scrublands, woodlands, and deserts.〔 It prefers dry, open, sandy to rocky slopes and flats.〔 It occurs on all soil types, but has poor growth in clay soils.〔 It is tolerant of arid environments such as desert floors, and it is the dominant grass in some desert scrub regions.〔(US Forest Service Fire Ecology )〕 It is found on plains, in sand dunes, and on rocky hillsides.〔 It grows from sea level to about .〔〔 In the Mojave desert, it grows up to in the Mojave Desert,〔〔 It is common in creosote bush scrub, Joshua Tree woodland, and blackbrush scrub plant communities, and areas with sandy soils, such as the Kelso sand dunes.〔〔〔 In the eastern Mojave Desert, it is more common than its relative, galleta grass (''Pleuraphis jamesii'').〔 It is a common native to the Mojave Desert〔〔 and Sonoran Desert〔〔 to Sonora, Mexico.〔 It can be found in California, Arizona into northern Mexico, Colorado, Utah, less commonly, but also in other parts of Mexico and rarely in sand dunes in Utah's Washington and Kane counties.〔〔 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「Hilaria rigida」の詳細全文を読む スポンサード リンク
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