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Key to Eleocharis, Key B: spikerushes with culms nodose-septate (bearing complete septae, externally evident); achenes biconvex

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1 Culms < 3 mm in diameter.
..2 Spikelets cylindric, the width the same as the width of the culms; roots with conspicuous tubers; [cultivated waif, GA, potentially elsewhere]
..2 Spikelets ovoid, the width of the base slightly exceeding the width of the culms; roots without tubers; [common, widespread native, GA and FL w. to TX]
1 Culms > 5 mm in diameter.
....3 Spikelets narrowly ovoid, wider at the base and tapering to the apex; achene bodies < 1.2 mm long, surface finely reticulate; scales (2-) 2.5-3 mm long, delicate, purplish-brown; [uncommon, c. FL]
....3 Spikelets cylindric, the width uniform from base to apex; achene bodies > 1.4 mm long, surface rugulose; scales 4.5-7 mm long, leathery (besides margins), pale yellowish-brown; [common to intermittent, collectively widespread].
......4 Achenes 1.8-2.3 mm long; pistillate scales 5.2-7 mm long; achene faces with longitudinal rows of enlarged linear cells separated by obscure longitudinal lines; perianth bristles slender and flexuous, finely spinulose, shorter than to equaling the achene (to 2.5 mm long); culm septae widely (> 10 mm) and ± evenly spaced; [widespread in our area]
......4 Achenes 1.4-1.8 (-2) mm long; pistillate scales (4-) 4.5-5 mm long; achene faces with 20-40 bold transverse-rugulose lines; perianth bristles stiff and stout, coarsely spinulose, exceeding the achene (to 2.9 mm long); culm septae concentrated proximally (below spikelet); [OK, TX, AL, and FL; widespread in c. and s. FL]
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