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Key to Oryza

Poaceae

Oryza

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1 Spikelets persistent; lemmas usually unawned; mature grains brown, tan or white-colored; plants usually cespitose annuals (rarely perennial); [common non-native in MS river floodplain and w. Gulf coastal plain, scattered as a waif eastwards]
1 Spikelets deciduous; lemmas awned; mature grains reddish-brown to dark-red; plants cespitose or rhizomatous, annual or perennial; [uncommon non-native, s. FL]