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Key to Halophila

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1 Plants with erect stems, the leaves borne at the apex of the erect stem.
  2 Leaves 2-3 per stem; erect branches ca. 2 (-4) cm long
  2 Leaves 6-7 per stem; erect branches to 10 cm long
1 Plants lacking erect stems, the leaves apparently attached to the rhizome.
    3 Leaf blades elliptic, 10-25 mm long × 3-6 mm wide; < 5× as long as wide
    3 Leaf blades linear-lanceolate, 5-25 mm long × 1-4 mm wide, > 5× as long as wide