String of Hearts, Ceropegia woodii, is just one of many species in the genus Ceropegia that are grown as ornamental houseplants. Native to southern Africa, the stringy, purplish stems are vining or trailing, making this best grown as a hanging plant, or they can be trained up a small trellis. The beautiful heart-shaped leaves are 1-2 cm wide and long. They are dark green marbled with white variegation.
Other common names include rosary vine, chain of hearts, collar of hearts, and hearts entangled (because the stems easily enmesh).