greene, those leaves are from the large cottonwood tree growing behind where the weeds are. Heh, and NO! I'm not touching those nasty, stickery plants! I did put some of the stickers into a small pot to see if anything comes up.
After looking at the photos of the Cenchrus longispinus, I agree that the distribution of burrs is very different. These are consistently spaced out along the stem as shown in my first photo. And these burrs aren't nearly as spiney.
Hmmm, maybe someone at an Extension office could help with the ID. Think I'll see if I can find someone in officialdom to send a photo to.
