In 1831 David Douglas, a Scottish botanist, christened it the blue oak for the bluish cast of its deeply lobed leaves. (A digression: Douglas, for whom the Douglas-fir and hundreds of other ...

Poison oak may have more than three leaves, and depending on the season, species and local environment, plants can vary. Poison oak, either Pacific or Atlantic, is a native plant in the United ...

But the three-leaves rule isn't hard and fast one. Poison oak may have more than three leaves, and depending on the season, species and local environment, plants can vary.

Leaves Everywhere Not only do pollinating oak trees cause wheezing and sneezing for millions of locals, but they also create a bit of a mess in our lawns. The spring brings new growth to the trees ...