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Aztekium
The genus ''Aztekium'' contains three species of small globular cactus. Discovered in 1929 by F. Ritter, in Rayones, Nuevo León, Mexico, this genus was thought to be monotypic (with ''Aztekium ritteri'') until a second species (''Aztekium hintonii'') was discovered by George S. Hinton, in Galeana, Nuevo León in 1991. A further species, ''Aztekium valdesii'', was discovered in 2011 by M.A. Alvarado Vázquez in the Sierra Madre Oriental mountains of Nuevo León; the name was formally published in 2013,〔 although the name is not accepted by secondary sources such as The Plant List.〔(【引用サイトリンク】title=Search for ''Aztekium'' )〕
==Description==
''Aztekium ritteri'' is a small plant (around 20 mm wide), with 9 to 11 ribs, which typically have transverse wrinkles. Its color varies from pale green to grayish-green. The center of the cactus contains a lot of white wool. Flowers are small (less than 10 mm wide), with white petals and pinkish sepals. The plants bear small pinkish berry-like fruits. ''A. hintonii'' is larger, to 10 cm in diameter, 10 to 18 grooved ribs, flowers magenta to 3 cm. It grows only on gypsum. ''A. valdesii'' is up to 6 cm in diameter, has 5 grooved ribs, and has seeds notably different from other two ''Aztekium'' species.
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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