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See list of 3 species in this genus
  • 1a. Stem leaves mostly opposite; apical portion of stem and axis of inflorescence glabrous or nearly so; calyx with 2 lateral lobes, each lobe tipped by a foliaceous appendage
  • 1b. Stem leaves mostly alternate; apical portion of stem and axis of inflorescence villous; calyx either with 2 lateral lobes that lack foliaceous appendages or with 5 subequal lobes
    • 2a. Calyx with 2 lateral lobes separated by a shallow apical and deep basal sinus; plants 15–40 cm tall; stems typically clustered, simple; capsules lanceoloid-obloid, ca. 2 times as long as the persistent calyx
    • 2b. Calyx with 5 subequal lobes; plants 40–90 cm tall; stems solitary or sometimes paired, simple or with arching branches; capsules ovoid, barely exceeding the persistent calyx

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 Show photos of:   Each photo represents one species in this genus.