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San Mateo Thornmint
Acanthomintha duttonii
About San Mateo Thornmint (Acanthomintha duttonii) 0 Nurseries Carry This Plant 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. 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 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. 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. All Acanthomintha species. All four thornmint species are aromatic annual wildflowers native to the state of California in the USA. The species have square stems that are erect growing. The leaves are petioled with leaf veins conspicuous and the leaf margins are often spiny. The Inflorescences of the Acanthomintha genus are described as "head-like, in terminal clusters" by the genus authority James D. Jokerst.
Plant Description
Plant Type
Plant Type
Annual herb

7.9 in tall

Flower Color
Flower Color
Cream, Pink

Landscaping Information
Natural Setting
Annual Precipitation: 16.8" - 28.8", Summer Precipitation: 0.17" - 0.34", Coldest Month: 47.2" - 49.6", Hottest Month: 68.6" - 72.3", Humidity: 1.28" - 17.21", Elevation: 24" - 635"

Alternative Names
Common Names: Dutton's Acanthomintha, San Mateo Thorn-mint

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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