<P> Pines have four types of leaf: </P> <Ul> <Li> Seed leaves (cotyledons) on seedlings are borne in a whorl of 4--24 . </Li> <Li> Juvenile leaves, which follow immediately on seedlings and young plants, are 2--6 cm long, single, green or often blue - green, and arranged spirally on the shoot . These are produced for six months to five years, rarely longer . </Li> <Li> Scale leaves, similar to bud scales, are small, brown and not photosynthetic, and arranged spirally like the juvenile leaves . </Li> <Li> Needles, the adult leaves, are green (photosynthetic) and bundled in clusters called fascicles . The needles can number from one to seven per fascicle, but generally number from two to five . Each fascicle is produced from a small bud on a dwarf shoot in the axil of a scale leaf . These bud scales often remain on the fascicle as a basal sheath . The needles persist for 1.5--40 years, depending on species . If a shoot is damaged (e.g. eaten by an animal), the needle fascicles just below the damage will generate a bud which can then replace the lost leaves . </Li> </Ul> <Li> Seed leaves (cotyledons) on seedlings are borne in a whorl of 4--24 . </Li> <Li> Juvenile leaves, which follow immediately on seedlings and young plants, are 2--6 cm long, single, green or often blue - green, and arranged spirally on the shoot . These are produced for six months to five years, rarely longer . </Li>

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