This is Allamanda cathartica, also known as Common Trumpetvine, Brown Bud Allamanda, Golden Trumpet, and Yellow Allamanda. This climbing vine likes to live in sun to partial shade where it can grow to about 20 feet long and sports beautiful yellow blossoms from the middle of the summer until early fall. If pruned it can be trained into a small shrub which makes a great house plant. This very fragrant plant is native to Brazil. USDA Hardiness Zones 9 to 11.