Lupinum is a very unusual ever-changing philodendron. It starts out in it's juvenile state having small one to two inch leaves with velvety tops and maroon undersides, then when given a totem to climb the leaves will morph into 10 to 12 inches in size, with a glossy corrugated pattern while still holding the maroon underside. Juvenile plants tend to look nothing like the mature specimens.
Philodendron Lupinum / Red Underside
They grows best in bright, indirect light. Care also requires that the soil be free draining but hold some water. If you are growing this plant as a houseplant, half and half mix of potting soil and orchid soil or perlite will provide the kind of soil anthuriums prefer.