For a Giant Flytrap in Pathfinder, the rules text indicates: "If a giant flytrap begins its turn with an opponent at least two size categories smaller than itself grappled..., it can close its jaws completely around the foe...". Does that mean it can engulf medium creatures, or it can't?
Note that I read through this message board post, which indicates it can't. However, I disagree since I interpret "at least two size categories smaller than itself" to be smaller than or equal to medium, as opposed to smaller than medium.