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Key to Cuphea

Lythraceae

Cuphea

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(c) Davis, Scott Allen - CC-BY
1 Leaves whorled (at least some); pedicels 4-25 mm long; [pine flatwoods of FL Panhandle]
(c) Hill, Sonnia
1 Leaves opposite (none whorled); pedicels 0-6 mm long; [collectively widespread].
  2 Floral tube 4-6 mm long, glabrous inside; stamens much shorter than the floral tube; petioles 0-2 mm long
  2 Floral tube 5.5-12 mm long (12-21 mm in C. procumbens), villous, wooly, or finely puberulent inside; stamens equal to or exceeding the floral tube; petioles 0-20 mm long.
    3 Floral tube 8-21 mm long, villous or wooly inside; leaves sessile (C. procumbens) or with petioles (2-) 5-15 (-20) mm long
(c) Hernández, Alexis López - CC-BY
      4 Leaves sessile; floral tube 12-21 mm long; seeds ca. 2.5 mm long; [waif]
(c) Julie, Tuttle - C, permission granted to NCBG
      4 Leaves not sessile, petioles (2-) 5-15 (-20) mm long; floral tube 8-12 mm long; seeds 2.3-2.8 mm long; [widespread native]
    3 Floral tube 5.5-8 (-9) mm long, the inner glabrous proximally and finely puberulent to villous distally; petioles 0-2 mm long; seeds 1.5-22.0 mm long.
        5 Floral tube base rounded; seed margins rounded; [LA and TX]