The original Christmas tree was a Spruce, which is distinguished by its cone shape and whorled branches. The needles of a Spruce are attached singly to the branches rather than in bunches, in a spiral ...

One of the most interesting evergreens is the weeping blue spruce (Picea pungens 'Pendula'). This cultivar of the native Colorado blue spruce was a selected seedling grown in a tree nursery in the ...

The reproductive potentials of balsam fir and white spruce (co-dominants in mixedwood forests) and black spruce (dominant in coniferous forests) were studied to explain the location of the ecotone ...

This is a preview. Log in through your library . Abstract Previously published reports indicated that germination of some tree seeds might be controlled by an endogenous germination periodicity. It is ...