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''Leuchtenbergia principis'' (agave cactus or prism cactus), the sole species of the genus ''Leuchtenbergia'', is a species of cactus. It is native to north-central Mexico (San Luis Potosi, Chihuahua). The genus is named after Maximilian Eugen Joseph (1817–1852), Duke of Leuchtenberg and amateur botanist. It is very slow-growing but can eventually grow up to 70 cm high, with a cylindrical stem which becomes bare and corky at the base with age. It has long, slender, grayish-green tubercles 6–12 cm long, with purplish-red blotches at their tips. The tubercles are topped with papery spines, making the plant resemble an agave; old, basal tubercles dry up and fall off. After four years or so, yellow, funnel-shaped flowers 5–6 cm diameter may be borne at the tubercle tips. The fruit is smooth and green, 3 cm long and 2 cm broad. It has a large, tuberous taproot. ==Taxonomy== It is related to the genus ''Ferocactus'', and hybrids have been created between these two genera. File:Leuchtenbergia principis 5.JPG|''Leuchtenbergia principis'' File:Leuchtenbergia principis 10.JPG|The flower of ''leuchtenbergia principis'' File:Leuchtenbergia principis 4.JPG|''Leuchtenbergia principis'' seen from above 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「Leuchtenbergia」の詳細全文を読む スポンサード リンク
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