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Key to Eustoma
Gentianaceae
Eustoma
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40796
1 Corolla lobes mostly 15-25 (-30) cm long, 5-15 mm wide; calyx lobes mostly 10-15 mm long; [FL and westwards]
1 Corolla lobes mostly 25-50 mm long, 20-30 mm wide; calyx lobes mostly 15-25 mm long; [LA and westwards]