No key was found for the requested taxon, but it has only one child: Obolaria virginica. Showing where it is keyed below.

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Key to Gentianaceae

Gentianaceae

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(c) Bradley, Keith
(c) Dill, Becky
1 Leaves all scale-like, 1-3 (-5) mm long, appressed to the stem.
(c) Danielson, Erik
  2 Plants green or purplish-brown, with chlorophyll (hemimycoheterotrophic); [tribe Gentianeae, subtribe Swertiinae]
(c) Bradley, Keith
  2 Plants white or cream, lacking chlorophyll (holomycoheterotrophic); [tribe Voyrieae]
(c) Sorrie, Bruce A. - CC-BY
1 Leaves larger, spreading or ascending.
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
(c) Sorrie, Bruce A. - CC-BY
    3 Stem leaves whorled; plants robust, 1-3 m tall; [tribe Gentianeae, subtribe Swertiinae]
    3 Stem leaves opposite; plants generally < 1 m tall.
(c) Frumkin, Ron - CC-BY-NC, permission granted to NCBG
(c) Nesterova, Svetlana - CC-BY-NC, permission granted to NCBG
      4 Calyx lobes 6-8; corolla bright yellow
      4 Calyx lobes 0 (or interpretable as 2) or 4-5; corolla pink, blue, white.
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
        5 Calyx lobes 0 (but the flower subtended by 2 leaflike bracts that have sometimes been interpreted as sepals); stem leaves obovate, widest near the rounded tip), 0.5-1.5 cm long, crowded near the tip of the stem, basal rosette never present; [of nutrient-rich, mesic forests]; [tribe Gentianeae, subtribe Swertiinae]
(c) Ward, Scott G
        5 Calyx lobes 4-5; stem leaves lanceolate, ovate, elliptic or narrowly elliptic (widest near the middle or toward the base, the tip acute or acuminate), mostly > 1.5 cm long, distributed fairly evenly along the stem, basal rosettes sometimes present; [of various more-or-less open habitats (except some species of Gentiana, which can occur in nutrient-rich, mesic forests)].
© Floyd A. Griffith
(c) Griffith, Floyd A.
          6 Corolla lobes 5-14, longer than the corolla tube, pink or white; [common natives]; [tribe Chironieae, subtribe Chironiinae].
(c) Cressler, Alan M.
             7 Stigmas shorter than the style
(c) Griffith, Floyd A.
             7 Stigmas equaling or longer than the style
(c) Ward, Scott G
(c) Bradley, Keith
          6 Corolla lobes 4-5, shorter than the corolla tube, blue, lavender, pink or white.
(c) Rompaey, Lies Van - CC-BY
               8 Corolla tube < 2 mm wide; [rare to uncommon exotics, naturalized in disturbed areas]; [tribe Chironieae, subtribe Chironiinae].
(c) Langeveld, Michel - CC-BY
                 9 Style not divided or subcapitate; stigma lobes rhombic to fan-shaped, not fleshy; capsule elliptic to ovoid
(c) Cressler, Alan M.
(c) Ward, Scott G
                   10 Corolla lobes alternating with corolla appendages (appearing as plaits or lobes, these often toothed, notched, or lacerate, sometimes as long as or longer than the true corolla lobes); main stem leaves cuneate at the base; perennial; [tribe Gentianeae, subtribe Gentianinae]
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
                   10 Corolla lobes not alternating with corolla appendages; main stem leaves rounded to cordate at the base; biennial or annual; [tribe Gentianeae, subtribe Swertiinae].
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
                     11 Corolla lobes 4, finely fringed; main stem leaves rounded at base, with lateral veins obscure; biennial
© Derick Poindexter
(c) Gunnar, Aaron - CC-BY
                     11 Corolla lobes 5, entire, not fringed; main stem leaves cordate (the cordate bases often overlapping the opposite leaf), with 2-3 well-developed lateral veins (prominently visible on the lower surface); annual