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Key to Fagopyrum
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40205
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 |