The pine nuts we eat come primarily from the seeds of certain species of pine trees. Common sources of edible pine nuts include:

1. Korean Pine (Pinus koraiensis) - Commonly found in East Asia, especially China and Korea, it produces large, flavorful pine nuts.
   
   
2. Chilgoza Pine (Pinus gerardiana) - Grown in the Himalayan region, mainly in Pakistan, India, and Afghanistan.
   
   
3. Stone Pine (Pinus pinea) - Found in the Mediterranean, this pine produces the familiar Mediterranean pine nut used in dishes like pesto.
4. Siberian Pine (Pinus sibirica) - From Siberia and parts of Russia, producing small but highly nutritious pine nuts.

Each of these pine species produces nuts with slightly different flavors, but all are rich in nutrients and popular as snacks and in cooking.