Mimulus eastwoodiae is endemic to the Canyon Lands of southeastern Utah and adjacent Colorado, Arizona, and New Mexico. Approximately 25 occurrences have been mapped, and an additional 30-40 sites have been documented in the Navajo Nation. The hanging garden communities in which this species occurs are vulnerable to any disturbance of the water supply, which can occur due to prolonged drought, global climate change, or water development projects. While this species is relatively widespread and drought-tolerant compared to other hanging garden endemics of this region, these ongoing threats to its habitat will eventually impact its persistence and are a concern. Other threats, including disturbance by livestock and humans, are considered relatively minor because many sites have low accessibility.
Occurs in hanging garden communities around seeps. These communities are vulnerable to any disturbance of the water supply, which can occur due to prolonged drought, global climate change, or water development projects. Many hanging gardens in the Navajo
In Colorado, approximately 8 occurrences (depending on delineation) are known from 4 counties (Montrose, Mesa, San Miguel, and Delta); nearly all of these occurrences have been visited recently (1997 or later). In Arizona, approximately 5 occurences (depending on delineation) are known from 3 counties (Apache, Navajo, and Coconino); nearly all of these occurrences have been visited recently as well (2001 or later). In Utah, 10 occurrences are believed extant in 4 counties (Garfield, Grand, Kane, and San Juan), although they have not been re-visited recently (last visited between 1952 and 1986). An additional 11 occurrences in Utah are believed historical. In the Navajo Nation, surveys of the species' hanging garden habitat have been conducted, but individual occurrences have not been mapped; so far, it has been documented in approximately 30-40 hanging gardens (D. Roth, pers. comm. 2008). The New Mexico occurrence (on Navajo Nation lands) was discovered in 2002 and is close to the Arizona border.
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