Wind was the cause of the premature death of my sunflower stand. Luckily, I snapped this photo the day before. There were no buds, so perhaps the wind ended a prolonged demise. One thing I love about sunflowers that I don't find in cacti flowers; as the season moves on, the sunflowers get larger. Cactus flowers get smaller.
Sometimes identified as Vinca, there really is a difference. I find the simplicity of these flowers very appealing, and that white is really pure white!
My educated guess last year as to the species of the cactus turned out to be right. However, rather than a few years away from blooming, this cactus came through with an early flower this past week!