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Opuntia fragilis
''Opuntia fragilis'', known by the common names brittle pricklypear and little prickly pear, is a prickly pear cactus native to much of North America. It occurs in several Canadian provinces. It is known from farther north than any other cactus,〔C.Michael Hogan. 2011. (Cactus. Topic ed. Arthur Dawson. Ed.-in-chief Cutler J.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment. Washington DC )〕 occurring at as close as 8°south of the Arctic Circle, (58°N latitude) in Alberta.〔(US Forest Service )〕 There is an isolated and possibly genetically unique population in Eastern Ontario known as the "Kaladar cactus".〔http://www3.sympatico.ca/lycacti/kaladar.html〕
==Description==
Brittle pricklypear is a small decumbent cactus that grows to a maximum height of 10 centimeters (4 in).〔(32. Opuntia fragilis (Nuttall) Haworth ), Flora of North America〕 Both the common and scientific names refer to the easily detached stem segments. This is known to be a means of plant dispersal.〔
''Opuntia fragilis'' is a small, prostrate plant, rarely more than 4 inches high: joints tumid, fragile, easily detached, oval, elliptical, or subglobose, 1-2 in. long and nearly as thick as broad, bright green: areoles ¼-½ in. apart, with whitish wool and a few white to yellow bristles, which are much longer and more abundant on older joints; spines 1-4, occasionally a few small additional ones, weak, dark brown, the upper one usually longer and stronger than the others, rarely an inch in length: flowers greenish yellow, 1-1¼ inches wide: fruit ovate to subglobose. with few spines or bristles, mostly sterile, an inch or less long; seeds few and large. Rocky Mountain region from Canada to New Mexico.〔Haw.〕
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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