It is native to southeast Brazil and is part of the section Baursia. In fact, it is the type species of this section. It has long lance-shaped leaves that point upwards with a large predominant midvein. The midvein is used to store water for periods of drought that occur during the dry season. Along the midvein there are small red glands that produce a clear sap that results in a freckled-look on both sides of the leaves. The leaves themselves can grow to almost a meter long with a width of about 10 cm. Also, the plant has a climbing growth habit. The aerial roots of the plant are red when they first begin growing and later turn a dark brown with age. The spadix of Philodendron crassinervium gets to about 20–25 cm long and is covered by a spathe that is white with shades of a dark red towards the bottom where the spadix emerges. The berries produced contain eight axile ovules in each ovary locule.