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Caption: Catkins on a birch (Betula sp.) tree. Catkins consist of many tiny petal-less flowers clustered around an axial stem. The male catkins (long and hanging) release millions of pollen grains, which are carried on the wind to pollinate the female catkins (short and protruding upwards). Photographed in Maryland, USA.

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Keywords: betula sp., biological, biology, birch tree, botanical, botany, branch, branches, catkin, catkins, dangling, flower, flower head, flowering, flowers, hanging, horticultural, horticulture, nature, reproduction, reproductive

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