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Key to Wolffia

Araceae

Wolffia

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1 Fronds globoid to ovoid, 1-1.5× as deep as wide; thallus not brownish punctate above; [section Wolffia].
(c) Steven, Daniel - C, permission granted to NCBG
(c) Spaulding, Dan - CC-BY-NC, permission granted to NCBG
  2 Fronds 1.0-1.3× as long as wide, 0.4-1.2 mm wide
(c) chiuluan - CC-BY
  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]
(c) MacNeal, Dan - CC-BY
(c) Burdick, Kenneth - CC-BY
    3 Frond 1.3-2.0× as long as wide, the upper side slightly convex, with an upward point apically
(c) Danielson, Erik
(c) Danielson, Erik
    3 Frond 1.0-1.5× as long as wide, the upper side with a prominent papilla centrally