One of the southern yellow pine trees that have native populations in Frederick County is the shortleaf pine (Pinus echinata). There are some small populations of this tree scattered around Sugarloaf ...

The visible yellow pollen comes from pine trees, which are wind-pollinated. Despite its visibility, pine pollen is not the primary cause of spring allergies. Smaller, unseen allergens like oak pollen ...

Add Yahoo as a preferred source to see more of our stories on Google. A western pine beetle rests on a sap mound on a pine tree. - Charles Wollertz/Getty Images A thriving pine tree is a thing of ...