Texas Gardening: Trying to ID this native plum, 1 by texasflora_com

texasflora_com wrote:
Further confusing the matter is how wildflower.org and many other resources focus mainly on pictures of the blooms instead of the foliage. The blooms all look about the same to me and I have a much easier time identifying certain plants by their overall form and their leaves. I can easily see why so many people nickname various suckering/thicket forming plums "hog plum". Because if you look into just about any thicket of them, you'll see well worn trails made by the wild hogs. The mexican plum doesn't sucker, so calling it a hog plum doesn't happen so much.
I've concluded that the thicket forming low growing wild plum that numbers in the millions just in my area alone is prunus angustifolia (chickasaw plum) rather than prunus rivularis (creek plum) based merely on the fact that the USDA map shows it in my county but does NOT show prunus rivularis in my county. I realize you can't count on all data but surely it would be shown on my county map by now since it's been around so long and so prolifically. If you read various descriptions scattered all over of each one, some say it's too tart to eat but I know for a fact that some of this year's crop was actually not very tart and actually sweet. I guess the only thing left I can do to possibly remove all doubt is examine closeups of the seed after drying out since USDA does have pics of the seed. It's a lot of trouble to go to but I do like to be able to call a plant by the right name without having any doubt.