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Key to Fagopyrum

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1 Flowers white, 3-4 mm long; achene smooth and shiny, mostly 5-7 mm long; inflorescences often flat-topped, borne near the stem tips
1 Flowers greenish, 2-3 mm long; achene rough and dull, mostly 4-5.5 mm long; inflorescences elongate, mostly in leaf axils
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