By Sterling Randle. SALT LAKE CITY — SB41, a bill that would change the state tree from the Colorado blue spruce to the Quaking Aspen, passed in the Senate on Monday, Feb. 11, 2014.

DNA samples from one of the world’s largest and oldest plants — a quaking aspen tree (Populus tremuloides) in Utah called Pando — have helped researchers to determine its age and revealed ...