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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Wolffia

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1 Fronds globoid to ovoid, 1-1.5× as deep as wide; thallus not brownish punctate above; [section Wolffia].
  2 Fronds 1.0-1.3× as long as wide, 0.4-1.2 mm wide
  2 Fronds 1.3-2.0× as long as wide, 0.3-0.5 mm wide
1 Fronds nutshell-like, 0.5-1.0× as deep as wide; thallus punctate above with brownish pigment cells (most visible on dead fronds); [section Pigmentatae]
    3 Frond 1.3-2.0× as long as wide, the upper side slightly convex, with an upward point apically
    3 Frond 1.0-1.5× as long as wide, the upper side with a prominent papilla centrally
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