Flora of North America species comparison

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Wolffia borealis

northern water-meal, wolffie boréale
Fronds

boat-shaped, 0.7–1.5 mm, 1.3–2 times as long as wide, 0.7–1 times as deep as wide, with point at apex bent upward;

papilla absent;

upper surface intensely green, with 50–100 stomates;

pigment cells present in vegetative tissue (visible in dead fronds as brown dots).
2n

= 20, 22, 30, 40.

Wolffia borealis
Phenology Flowering (very rare) summer–early fall.
Habitat Mesotrophic to eutrophic, quiet waters in temperate regions
Elevation 0–1400 m (0–4600 ft)
Distribution
from FNA
CA; CO; IA; ID; IL; IN; KS; KY; MA; MI; MN; MO; MT; NE; NH; NY; OH; OK; OR; PA; SD; TN; UT; VT; WA; WI; AB; BC; ON; QC
[WildflowerSearch map]
[BONAP county map]
Discussion

The name Wolffia punctata has been applied to this species in error.

I know of no specimens of Wolffia borealis from Rhode Island.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22, p. 152.
Parent taxa Lemnaceae > Wolffia
Sibling taxa
W. arrhiza, W. brasiliensis, W. columbiana, W. globosa
Synonyms W. brasiliensis var. borealis
Name authority (Engelmann) Landolt: Ber. Geobot. Inst. ETH Stiftung Rubel 44:137. (1977)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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