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Acanthomintha duttonii
''Acanthomintha duttonii'' is a species of annual plant endemic to San Mateo County, California in the Lamiaceae family. It is commonly called San Mateo Thornmint or Dutton's acanthomintha and is found growing on Serpentine soils near the Crystal Springs Reservoir in a six-mile (10 km) long strip on the east side of Montara Mountain at elevations of approximately 150 to 300 meters.
==Distribution==
This rare annual species of wildflower has populations that fluctuates yearly with recorded population ranges from 50,000 plants to as few as 5,000 plants and is considered critically endangered 〔Jokerst, J.D. 1991. A revision of ''Acanthomintha obovata'' (Lamiaceae) and a key to the taxa of Acanthomintha. Madroño. 38: 278-286.〕 due to the species narrow range of growing conditions and the fragmented nature of the populations over the limited habitat and by the encroachment of urban development.〔Andrew Kratter, ''Report of endangered species search and vegetative survey of the Polhemus Property at the northeast corner of the intersection of Ralston Avenue and State Route 92, San Mateo'', Earth Metrics file reference 7649W0, prepared for San Mateo County, California, July, 1989〕 The species is named in honor of Harry Arnold Dutton (1873–1957), who, in 1949, located a patch of another rare plant ''Cupressus abramsiana'' on nearby Butano Ridge.
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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