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Key to Distichlis
Poaceae
Distichlis
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39762
1 Leaf blades < 1.5 cm long, subulate; plant colonial by surficial stolons (rarely rhizomatous); pistillate and staminate inflorescence with 1 spikelet; [FL and other subtropical shores]
1 Leaf blades 2.5-14 cm long, flat (though often involute when dry); plants colonial by subterranean rhizomes; pistillate and staminate inflorescences with > 1 spikelet; [widespread]