DO YOU KNOW THE NAME OF THIS PLANT?

The previous owners of our house were from Hawaii. They also moved back to Hawaii. But, they left behind seven plants. Six of the plants were orchids. I have no idea how to take care of an orchid. I think I have managed to kill all but one of them. But, they also left this plant and I have no idea what it is. I am assuming it is also a plant native to Hawaii. It looks like it is growing in just rock. There may be soil in the pot but it doesn't look like to me there is. In the second picture you can see that it looks like a vine that the leaves are growing from. It has really grown since we moved in. I will show you what it looks like in about six months.