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Key to Luziola

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1 Culms > 3mm in diameter; ligules 10-40 mm long  Luziola subintegra

1 Culms < 2 mm in diameter; ligules < 6 mm long.

2 Culms prostrate; leaves conspicuously clustered toward the apex of the culms, floating, 1-5 (-8) cm long; pistillate inflorescence an inconspicuous axillary raceme, 1.1-3.5 cm long, with 2-5 florets  Luziola fluitans var. fluitans

2 Culms suberect to erect; leaves scattered along the culm, not floating, > 6 cm long; pistillate inflorescence an axillary panicle, 2-21.5 (-58) cm long, with 18-250 (-350) florets.

Show caption*© Matt Berger, some rights reserved (CC BY), uploaded by Matt Berger     3 Pistillate florets 3-5 mm long; achenes striate  Luziola bahiensis

3 Pistillate florets 2-2.5 mm long; achenes smooth  Luziola peruviana