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Description
Leaf persistence in evergreen plants may vary from a few months(with new leaves constantly being grown as old ones shed), to several decades (over thirty years in Great Basin Bristlecone Pine Pinus longaeva).
One additional special case exists in Welwitschia, an African gymnosperm plant which produces only two leaves, which grow continuously throughout the plant's life but gradually wear away at the apex, giving about 20-40 years' persistence of leaf tissue.
There are many different types of evergreens, both trees and shrubs, including most species of: conifers (e.g. white/scots/jack pine, red cedar, blue spruce, hemlock), live oaks, holly, "ancient" gymnosperms like cycads, as well as most angiosperms from frost-free climates, such as rainforest trees and Eucalypts. [link]
One additional special case exists in Welwitschia, an African gymnosperm plant which produces only two leaves, which grow continuously throughout the plant's life but gradually wear away at the apex, giving about 20-40 years' persistence of leaf tissue.
There are many different types of evergreens, both trees and shrubs, including most species of: conifers (e.g. white/scots/jack pine, red cedar, blue spruce, hemlock), live oaks, holly, "ancient" gymnosperms like cycads, as well as most angiosperms from frost-free climates, such as rainforest trees and Eucalypts. [link]
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