Bubba Desert Willow - Chilopsis linearis 'Bubba'
The blossoms are a beautiful bright bicolor of lavender and dark purple.  Bubba is a vigorous grower.  Its flowers and leaves are larger than that of the species.  Bubba flowers throughout the summer.  Discovered by Paul Cox at the San Antonio Botanical Garden.  Can reach up to 20 feet in some areas.  Cold hardy to USDA Zone 7.