Leaves quite
tightly overlapping on stem, such that shoots become cylindrical or
catkin-like in appearance, if not, then leaf axils with gemmae;
leaves ovate to ovate-lanceolate, never obovate or spathulate; leaf
margins without teeth
Leaves
typically spreading from stem, shoots never cylinder or catkin-like
in appearance; gemmae rare; leaf shape various, sometimes obovate or
spathulate; leaf margins usually with teeth, at least near apex
