Let's say there is a large tract of land near you that has a couple of common species of sundew on it. The land has been sold, and is going to be cleared at some point in the future. Would you trespass onto the site and steal the plants to "save" them, rather than contacting the owner and asking if you could take them?
Now take the above situation except change the plants to a rarer species, such as Cephalotus. What would you do in this case?