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In botany, an evergreen plant is a plant that has leaves all year round. This contrasts with deciduous plants, which completely lose all their foliage for part of the year. Leaf persistence in evergreen plants may vary from only a few months (with new leaves constantly being grown and old ones shed), to several decades (over 30 years in Great Basin Bristlecone Pine Pinus longaeva [Ewers, F. W. & Schmid, R. (1981). Longevity of needle fascicles of Pinus longaeva (Bristlecone Pine) and other North American pines. Oecologia 51: 107-115.]).
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