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Common spruce, a monoecious species
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The common spruce (Picea abies) is a monoecious species in which the male and female cones are distinct but present on each tree. The male cones appear on the previous year's twig ; the female cones, initially erect in a terminal bud position, hang down when fertilized and eventually drop off in winter. When mature, their scales separate to release small, brown seeds with a winged membrane.
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