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Eryngium racemosum
''Eryngium racemosum'' is a rare species of flowering plant in the carrot family known by the common name delta eryngo, or delta button celery.
==Distribution==
It is endemic to California, where it is known from the Sacramento-San Joaquin River Delta region of the Central Valley up to the rise of the Sierra Nevada foothills. It is a plant of vernally wet and flooded areas near the waterways of the valley, habitat which has been altered and in some areas eliminated by human activity. It is also a member of the flora in the rare alkali sink habitat of the delta.〔Species Account. (Bay-Delta Conservation Plan ). November 7, 2008.〕 The plant has no federal listing but it is listed as an endangered species on the California state level.
There are 26 reported occurrences of the plant, but several of these have been extirpated.〔 Threats to the species include habitat destruction via alteration of water regimes and water diversion, changes to waterways by dredging and other maintenance activities, conversion of land to agriculture, and non-native plant species. The plant relies on the seasonal flooding that would occur naturally in the delta; this flooding is strictly contained and prevented today.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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