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Agave bracteosa
''Agave bracteosa'' is a species of agave sometimes known as "spider agave" or "squid agave." It is native to the Sierra Madre Oriental of Mexico, in the states of Tamaulipas, Coahuila and Nuevo León. It is found on cliffs and rocky slopes from 900 to 1,700 meters.〔Engelmann, Georg, Garden Chronicles 2:18, 776, fig 138, 139. 1882.〕
Small among the agaves, its green succulent leaves are long and lanceolate, 50-70 cm long and 3-5 cm at the base, where they are the widest. They have minute serrations (teeth) along the margins, but no teeth nor spine at the end. The leaves have a tendency to curl somewhat, in a fashion reminiscent of the octopus agave ''A. vilmoriniana''. The inflorescence spike is also short at 1.2-1.7 meters, and its upper third is densely covered with white or pale yellow flowers. The flowers are distinctive in that tepals arise from a disk-shaped receptacle rather than the usual tube. The stamens are quite long.〔Howard Scott Gentry, ''Agaves of Continental North America'' (University of Arizona Press, 1982) pp. 91-93〕
Gentry defines a group "Choritepalae" that includes ''A. bracteosa'' along with ''Agave ellemeetiana'' and ''Agave guiengola'', and states that the discoid receptacle and unarmed leaves are different enough from other agaves to justify placing ''A. bracteosa'' and ''A. ellemeetiana'' into a separate genus, but that characteristics of ''A. guiengola'' link the group to the rest of ''Agave''.
==References==
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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