Tall morningglory, Ipomoea purpurea, seedling.

Young plant with three heart-shaped green leaves on dark soil. The central leaf is prominent and lighter green than the other two smaller, darker green leaves. Copyright information is at the bottom (Copyright 2007 The Regents of the University of California. All rights reserved.). Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources
Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources