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Key to Lycopodioides

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1 Main stems erect, the plants to 5 dm tall, or climbing and to 10 m long; stems noticeably differentiated in thickness from the main stem (base of plant) to the terminal branches; rhizophores 1-3 mm in diameter.
  2 Stems erect to 5 dm tall; stems with dense, stiff hairs; median leaves long-acuminate to bristle-tipped
  2 Stems vinelike, climbing, to 10 m tall or long; stems lacking hairs; median leaves acute
1 Main stems creeping or ascending; stems only slightly it at all differentiated in thickness from base to apex of plant; rhizophores 0.02-0.4 mm in diameter.
    3 Margins of lateral leaves entire; lateral branches of the stems further branching 2-3 times
    3 Margins of lateral leaves dentate-serrate; lateral branches of the stems further branching 1-2 times
      4 Median leaves 0.7-1.2 mm long, with bristle-tipped apex up to 1/3 the length of the leaf; plants < 6 cm in diameter; [s. FL]
      4 Median leaves (1-) 1.25-1.5 (-1.8) mm long, with an acute or acuminate apex; plants > 6 cm long or in diameter; [more widespread, c. FL northwards].
        5 Leaves with margins of 3-5 rows of transparent (hyaline) cells; stomates of lateral leaves confined to near the midrib on the upper surface
        5 Leaves with margins undifferentiated or with 1-2 rows of slightly paler cells; stomates distributed over entire leaf surface
          6 Megaspores 0.29-0.35 (-0.38) mm in diameter, dull, closely reticulated; apices of median leaves acute to attenuated, usually keeled but with vein not extending almost to tip; lateral leaves 1.4-2.2 mm × 0.8-1.3 mm
          6 Megaspores 0.33-0.40 mm in diameter, shiny, more loosely reticulated; apices of median leaves long-attenuate to bristled, veined, the apices frequently recurved; lateral leaves ca. 1-2 mm × 0.5-1.3 mm

Key to Selaginella

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1 Median leaves 0.7-1.2 mm long, with bristle-tipped apex up to 1/3 the length of the leaf; plants < 6 cm in diameter; [s. FL]
1 Median leaves (1-) 1.25-1.5 (-1.8) mm long, with an acute or acuminate apex; plants > 6 cm long or in diameter; [more widespread, c. FL northwards].
  2 Leaves with margins of 3-5 rows of transparent (hyaline) cells; stomates of lateral leaves confined to near the midrib on the upper surface
  2 Leaves with margins undifferentiated or with 1-2 rows of slightly paler cells; stomates distributed over entire leaf surface
    3 Megaspores 0.29-0.35 (-0.38) mm in diameter, dull, closely reticulated; apices of median leaves acute to attenuated, usually keeled but with vein not extending almost to tip; lateral leaves 1.4-2.2 mm × 0.8-1.3 mm
    3 Megaspores 0.33-0.40 mm in diameter, shiny, more loosely reticulated; apices of median leaves long-attenuate to bristled, veined, the apices frequently recurved; lateral leaves ca. 1-2 mm × 0.5-1.3 mm