Floating plants. Molten Iron is hot. When I think of all this molten iron and high temperature, it reminds me of hot air balloons.
Hot air rises. Consider a plant that bobs up and down on the heat generated by the surface of your world. It bobs because it opens and closes the bottom of itself. When it's up high, it fills itself with cold air. When it drops down, it releases this cold air around it so that the hot air underneath it will push it upwards. It will never touch the molten iron, but it's constantly provided with lift. It's likely to actually look a bit like an ball , or kind of like a spherical parachute (Actually, it's probably going to pulse like a lung too). It's able to take this lift, and stay safe from the molten iron, while being able to photosynthesize in the air.
Perhaps you want something bigger. What if these plants grew in clumps? Now you have cloud sized floating plants.
But what if we don't want to be in the air all the time? Is there any way it can survive on the land?
Since we know the liquid is the melting point of iron, lets take the land to be of element x, with some melting point higher than iron. As noted in the comments of the question, the landmass is Tungsten. These plants would likely burn up instantly that close to the surface - unless they were made of something with a higher melting point, such as Carbon, or palladium. What if there were plants that self coated themselves with these elements? We're probably going to have to hand wave the internal cooling and nutrient transport systems, but lets say there's an element y in liquid form that doesn't boil at the planet's temperatures. They might be able to survive, although on a world described as such, photosynthesis is unlikely at the surface. Instead, they may turn to using geothermal energy..