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2 Stems smooth at leaf scars; inflorescence branches mostly thinner than vegetative branches | |
2 Stems knobby at leaf scars; inflorescence branches as thick as vegetative branches. | |
4 Sepals essentially equal, rounded, keeled or not, but none appendaged. | |
6 Glomeruls usually crowded into compound spikes; stems green or red; [wide ranging, usually in disturbed, often salted sites] | |
6 Glomerules not crowded into spikes; stems green; [northeastern North American tidal flats and salt marshes] |