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Key to Zeltnera

Gentianaceae

Zeltnera

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1 Corolla lobes 4-6 (-7) mm long; anther sacs (at maturity, when coiled) 0.9-1.6 mm long.
  2 Midstem leaves 3-8 mm wide; anther sacs (at maturity, when coiled) 1.4-1.6 mm long; corolla lobes mostly 5-6 (-7) mm long; [s. TX]
  2 Midstem leaves 1-3 mm wide; anther sacs (at maturity, when coiled) 0.9-1.1 mm long; corolla lobes mostly 4-5 mm long; [MO, AR, and w. LA west to se. KS, sw. OK, and wc. TX]
1 Corolla lobes 5-16 mm long; anther sacs (when coiled, at maturity) 0.5-2.5 mm long.
    3 Corolla lobes 7-16 mm long; midstem leaves 1-2 (-3) mm wide
    3 Corolla lobes 5-12 mm long; midstem leaves (1-) 3-13 mm wide