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In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2] Tree volumes and weights are not directly measured in the field, but computed from other variables that can be measured. [3] [4]
State federal district or territory Common name Scientific name Image Year Alabama: Longleaf pine: Pinus palustris: 1949 clarified 1997 [1] Alaska: Sitka spruce: Picea sitchensis: 1962 [2] [3] American Samoa: None [4] Arizona: Blue palo verde: Parkinsonia florida: 1954 [5] [6] Arkansas: Loblolly pine: Pinus taeda: 1939 [7] California: Coast ...
Gould's Ecoregions of Texas (1960). [1] These regions approximately correspond to the EPA's level 3 ecoregions. [2] The following is a list of widely known trees and shrubs found in Texas. [3] [4] [5] Taxonomic families for the following trees and shrubs are listed in alphabetical order by family. [6]
California has two high deserts: the Mojave Desert and the Great Basin Desert. The Mojave Desert ecoregion is marked by the presence of Joshua trees. [3] The dry cold Great Basin desert of California consists of the Owens Valley, and is classified into Great Basin shrub steppe by the WWF, [4] and into the Central Basin and Range ecoregion by ...
The Piney Woods is a temperate coniferous forest terrestrial ecoregion in the Southern United States covering 54,400 square miles (141,000 km 2) of East Texas, southern Arkansas, western Louisiana, and southeastern Oklahoma.
A hardiness zone is a geographic area defined as having a certain average annual minimum temperature, a factor relevant to the survival of many plants. In some ...
The Pinyon-Juniper Woodland Zone extends down to 5,000 feet (1,500 m) elevation. [4] Below 5,000 feet (1,500 m), there is not enough precipitation to support trees. The zones below this elevation are the Sagebrush Scrub Zone, Saltbush Scrub Zone, and the Alkali Sink Zone. These zones are distinguished by soil salinity. [4]
The geography of Texas is diverse and large. Occupying about 7% of the total water and land area of the U.S., [1] it is the second largest state after Alaska, and is the southernmost part of the Great Plains, which end in the south against the folded Sierra Madre Oriental of Mexico.