Pine Needles 2
by Lisa Wooten
Title
Pine Needles 2
Artist
Lisa Wooten
Medium
Photograph - Photographs
Description
Featured: ABC-E is for Evergreen 8/16/2017
Pines are conifer trees in the genus Pinus /ˈpiːnuːs/,[1] in the family Pinaceae. They are the only genus in the subfamily Pinoideae. The Plant List compiled by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts 126 species names of pines as current, together with 35 unresolved species and many more synonyms. Foliage[edit]
Illustration of needles, cones, and seeds of Scots pine (Pinus sylvestris)
Pines have four types of leaf:
Seed leaves (cotyledons) on seedlings, born in a whorl of 4�24.
Juvenile leaves, which follow immediately on seedlings and young plants, 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.
Scale leaves, similar to bud scales, small, brown and non-photosynthetic, and arranged spirally like the juvenile leaves.
Needles, the adult leaves, which are green (photosynthetic), bundled in clusters (fascicles) of 1�6, commonly 2�5, needles together, each fascicle 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. Wikipedia
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March 28th, 2016
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