About Philodendron cordatum Kunth ex Schott
Philodendron cordatum Kunth ex Schott is an uncommon species that is not frequently found in cultivation or sold as a houseplant. It is native to a small coastal region in Southeastern Brazil, located not far from Rio de Janeiro and São Paulo. This species of Philodendron is both epiphytic and epilithic, meaning it grows on trees or on rock outcroppings. It is typically a vining plant that can tolerate shade. If consumed, it is toxic to humans and most animals, with calcium oxalate as the toxic principle. Its leaves are heart-shaped and dark green, usually growing 2 to 3 inches across, and more mature leaves feature white speckles. This species can be easily propagated through stem cuttings, which can be rooted in water, soil, or sphagnum moss as a growing medium. The name Philodendron cordatum is often mistakenly used for the popular houseplant Philodendron hederaceum, also called ivy Philodendron. While the word "cordatum" means heart-shaped, and both species have heart-shaped leaves, this species name should not be applied to ivy Philodendron.
