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Picea chihuahuana, the Chihuahua spruce, is a medium-sized evergreen tree growing to 25–35 m tall, and with a trunk diameter of up to 1 m. It is native to northwest Mexico, where it occurs in 25 small populations in the Sierra Madre Occidental mountains in Chihuahua and Durango. It grows at moderate altitudes from 2300–3200 m, growing along ...
For some of these species, age estimates have been made on the basis of extrapolating current growth rates, but the results are usually largely speculation. White (1998) [104] proposes a method of estimating the age of large and veteran trees in the United Kingdom through the correlation of a tree's age with its diameter and growth character.
Quercus chrysolepis is an evergreen tree with significant-sized spreading, horizontal branches, and a broad, rounded crown; it attains a height of 6–30 meters (20–100 feet) and often forms as a shrub. [3] The trunk diameter typically ranges from 30 to 100 centimeters (12 to 39 inches).
It is an evergreen, long-lived, monoecious tree living 1,200–2,200 years or more. [4] This species includes the tallest living trees on Earth, reaching up to 115.9 m (380.1 ft) in height (without the roots) and up to 8.9 m (29 ft) in diameter at breast height. These trees are also among the longest-living trees on Earth.
Joshua trees grow quickly for a desert species; new seedlings may grow at an average rate of 7.6 cm (3.0 in) per year in their first 10 years, then only about 3.8 cm (1.5 in) per year. [27] The trunk consists of thousands of small fibers and lacks annual growth rings , making determining the tree's age difficult.
An evergreen forest is a forest made up of evergreen trees. They occur across a wide range of climatic zones, and include trees such as conifers and holly in cold climates, eucalyptus , live oak , acacias , magnolia , and banksia in more temperate zones, and rainforest trees in tropical zones.