While in a calm moment during the late days of the big project, I found and potted up some little surprises. They're probably sprouts from the Night Blooming Cereus in the yard. (The birdies are fond of the red fruits.) One sprouted in the sand alongside the patio and the other in the flower bed. We often find them in the fence line, too, fighting it out with little hackberry trees.
Given space and our USDA Zone 9B climate, these turn into large, blocky shrubs that usually have big, white, nighttime flowers and red oval fruit. The probable parent plant is probably 12 or 15 feet tall and 6 or 8 feet wide. There is an offspring planted in the front, which is already about 6 or 8 feet tall and it's only been in the ground for a few years.