This bright flower is a Tithonia - better known as a Mexican Sunflower. This beauty is nearly indestructible. It takes drought like a champ. It has huge, lush leaves that look very tropical and attractive even when not in bloom. Butterflies flock to the blooms. I recommend putting this one at the back of the border because it gets over 5 feet tall. It reseeds quite well on its own, or you can collect seeds from it for next year. One of the best annuals to plant in a forgotten corner that you won't be watering.