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Alturas (Spanish for "Heights"; Achumawi: Kasalektawi) [7] is the only incorporated city in Modoc County, California of which it is also the county seat. Located in the Shasta Cascade region of Northern California , the city had a population of 2,715 at the 2020 census .
Surprise Valley is an endorheic valley in extreme northeastern California, about 60 miles in length from north to south. Locals refer to the area as the Tricorner Region because of the region's location at the intersection of California, Oregon, and Nevada state lines. The valley is east of the Modoc County seat of Alturas.
For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [20]
Botanists have ranked the Sierra Nevada alpine zone floral bloom as one of California's foremost wildflower displays, with flowers of fantastic color and abundance. [8] Many of the alpine species are notable for large and showy flowers, which must compete for the pollinators during brief growing seasons. [ 5 ]
Alpine level: [7] [20] The zone that stretches between the tree line and snowline. This zone is further broken down into Sub-Nival and Treeless Alpine (in the tropics-Tierra fria; low-alpine) Sub-nival: [20] The highest zone that vegetation typically exists. This area is shaped by the frequent frosts that restrict extensive plant colonization.
Modoc National Forest was established as the Modoc Forest Reserve on November 29, 1904, by the United States General Land Office.It was named for the Modoc people who traditionally had their territory in this area.
The lowest-elevation biotic zone in the Sierra Nevada is found along the boundary with the Central Valley. [5] This zone, stretching in elevation from 500 to 3,500 feet (150 to 1,070 m), is the foothill woodland zone, an area that is hot and dry in the summer with very little or no snow in the winter. [5]
The Sierra Nevada lower montane forest is a plant community along a strip along the western and eastern edges of the Sierra Nevada mountain range in California. This zone is also known as a yellow pine forest. [1] Moving southward, the elevation range of the lower montane forest grows.