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Keyed in multiple places:

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Key to Linderniaceae

Linderniaceae

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1 Calyx conspicuously 5-winged (each calyx segment strongly keel-winged)
1 Calyx not winged.
  2 Flowers < 2 mm long
  2 Flowers > 4 mm long.
    3 Fertile stamens 4; calyx lobes connate at anthesis for > ½ their length, later separating
    3 Fertile stamens 2 (with 2 staminodia without anthers, or with rudimentary anthers); calyx lobes separate, or connate at base for < ¼ the length of the calyx.
      4 Capsule lanceoloid, > 8× as long as its diameter; calyx lobes connate at the base ca. ¼ the length of the calyx
      4 Capsule ovoid to ellipsoid, < 5× as long as its diameter; calyx lobes connate at the base ca. 1/8 the length of the calyx
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Key to Torenia

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1 Corolla 0.5-0.8 cm long; leaves 1-2 cm long; plants 10-20 cm tall
1 Corolla 2.5-4 cm long; leaves 3-5 cm long; plants 15-50 cm tall