I think this is blunt spikerush, (also called a spikesedge) Eleocharis obtusa, an American native. It's an annual with erect, cylindrical stems. Quite lovely!
I think this is sand spikerush, Eleocharis montevidensis, another native. It's more slender and less robust with a brilliant green tinge. We had all remarked that it looked just like lawn grass, and then I read here (Lady Bird Johnson Wildflower Center) that it is 'good as a lawn replacement for low, wet areas.' This spikerush is a perennial and spreads through runners.
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