| 5(4). |
Spikelets with unisexual florets only; staminate and pistillate spikelets conspicuously different |
Group A
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 (Hitchcock 1951) |
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| 5. |
Spikelets at least some with one or more perfect florets; if unisexual, then staminate and pistillate spikelets not conspicuously different |
6
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