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See list of 2 species in this genus
  • 1a. Flowers subtended by serrate leaf-like bracts (the lower flowers sometimes subtended by nearly pinnatifid bracts); leaf blades (15–) 20–40 (–60) mm long, the submersed ones with 7–14 pairs of segments 5–30 mm long; fruits 2.3–6 mm wide
  • 1b. Flowers subtended by pinnately lobed or divided leaf-like bracts [Fig. 681]; leaf blades 10–30 mm long, the lower and/or submersed ones with (4–) 6–9 (–12) pairs of segments 2–7.5 mm long; fruits 2–2.8 mm wide

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