tsuh yang wrote: >isn't this similar to azalea vs. rhododendron? Rhododendrons, as are many plants, are divided up into groups which are supposed to be similiar. Azaleas are a subgroup of rhododendrons. At one time all rhododendrons with five stamens were included in the "series" azalea. But of course, mankind's definitions do not always hold up. There are "azaleas" with ten stamens, and rhododendrons with five stamens. Then there is the problem of evergreen azaleas, and deciduous azaleas, which do not intercross, but again, with some exceptions. Best to just say, "azaleas are a kind of rhododendron but only some rhododendrons are azaleas" and go on to simpler problems. Ken