1) Senecio rivularis and Tephroseris crispa? Which is correct? 2) Populus italica or Populus nigra var.italica? Why so much tinkering with names? 3) Malus pumila or Malus domestica? Is there a difference? Malus pumila being a name to cover all apple hybrids? 4) On the photo is a species called Juniperus sabina (that's what I was told). In Tree Guide by Johnson and More there is a Juniperus foetidissima, eng. Stinking juniper. Here in Croatia, we call J.sabina a stinking juniper. I'm confused whether these are the same species?