Epithelantha are very small cacti with globe-shaped or cylindrical stems typically up to one inch in diameter, rarely reaching two inches long. Tiny whitish spines completely cover the surface of the stem. The flowers are also tiny, growing from the tip of the stem. Fruits are bright red. ...
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http://en.wikipedia.org/wiki/Epithelantha
(Button Cactus) The succulents in this group are slow growing, dwarf cacti. They are natives of the western U.S. and Mexico and are found growing in shallow soil on rocky hillsides. E. micromeris (Button Cactus) is a tiny, globular species that will reach a height of only 4 inches and make clusters up to 51/2 inches wide. Its pale green body is cov...
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http://www.encyclo.co.uk/local/10004
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