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Tridens flavus
Tall grass
Yes, it does. The tops of Johnson Grass are light and yellowish when young. Turning tan to brown later. If the grass starts out with this much red-purple-maroon color, it's probably Putpletop. Could be exceptions, I guess ... there often are!
How would you differentiate between the two? It looks really similar to Johnson grass.
Very similar "profile" to Johnson Grass ... I love it when people take photos of grasses!