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How are male and female pine cones produced on the same pine tree?
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pine
A stand of stone pines (Pinus pinea) in DoƱana National Park near Seville, Spain.
Pines are monoecious, meaning that both male and female reproductive structures are produced on the same tree. These structures, known as strobili or cones, develop at the beginning of each growing season in specific locations on the tree:1
- Male cones (microstrobili): These pollen-bearing structures typically emerge from bud scales at the base of the terminal bud, which is the area destined to become the current seasonās new growth. They are often found in clusters and are covered with fertile scales that each bear two pollen sacs.123
- Female cones (megastrobili): These ovule-bearing structures arise either singly or in a whorl near the apex (tip) of the current seasonās growth. They consist of spirally arranged scales, each of which bears two ovules.123
During the spring or early summer, the male cones release large quantities of wind-dispersed pollen. The female cones open their scales to receive this pollen, which is then trapped and drawn into the ovules to initiate the fertilization process.421