This is an info graphic on house plant that can be harmful or fatal for your cats.
All your cat has to do is rub up against some of these and then clean themself, this is enough to harm them. You need to be careful with the flowers that you bring in the house.
One Lady who received some daffodil's for Valentines Day, she put them in a vase and them placed them on a table. The cat has jumped up on it and rubbed up against it and then licked it's self clean later, which in turn made it become seriously ill, before passing away.
Some plants aren't as bad as others but you never know what kind of reaction your cat may have.