Possibly Andropogon glomeratus?

boy .... you went on a full spectrum walk about didnt you ... lol ... see what i did there including your rainbow post... lol ...

anyway ... on a color wheel .. the opposite of blue.. and i note that incredible blue sky in the pix... is orange.. and your eye saw the plant as orange.. this is why some painters would use one of the colors to intensify the other color ...

at the link.. note the red/green of xmas .. the yellow/purple of the LA Rams.. if they still exist and have that color scheme ... [some college teams also.. though none come to mind]

i bet.. if you went back on a cloudy day ... you might not see the orange at all ..

just an interesting sidebar ...

ken

https://duckduckgo.com/?t=ffcm&q=color+wheel&iax=images&ia=images

Andropogon glomeratus (Bushy Bluestem)...ah, that looks like it! A beautiful native, yea!

And yes, orange was just the closest basic color I could call it. This site below qualifies it as a "copper-orange," which I think is more accurate because it does look a lot like a shiny, new penny. Although, I might add in a little salmon pink, too...

"Foliage is vibrant green in the summer and turns copper-orange in the fall."