I've got several internet lists saved on "plants toxic to cats/non toxic to cats". Umbrella plants appear both on the non toxic and the toxic lists. This happens quite frequently. I wish someone would put together a proper, definitive list and say how toxic ie avoid altogether (lilies type toxic) or just not-a-good-idea if the cat eats some weird part of the plant. Right now it's utter confusion so I avoid anything on any of the toxic lists, although I suspect some of them are fine.