Wolffia borealis

(Engelmann) Landolt

Ber. Geobot. Inst. ETH Stiftung Rubel 44:137. 1977.

Common names: Wolffie boréale
WeedyIllustratedEndemic
Basionym: Wolffia brasiliensis var. borealis Engelmann in C. F. Hegelmaier, Lemnac., 127. 1868
Treatment appears in FNA Volume 22. Treatment on page 152.

Fronds boatshaped, 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.


Phenology: Flowering (very rare) summer–early fall.
Habitat: Mesotrophic to eutrophic, quiet waters in temperate regions
Elevation: 0–1400 m

Distribution

V22 22-distribution-map.jpg

Alta., B.C., Ont., Que., Calif., Colo., Idaho, Ill., Ind., Iowa, Kans., Ky., Mass., Mich., Minn., Mo., Mont., Nebr., N.H., N.Y., Ohio, Okla., Oreg., Pa., S.Dak., Tenn., Utah, Vt., Wash., Wis.

Discussion

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

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

Selected References

None.

Lower Taxa

None.

"-1timesasdeepaswide" is not declared as a valid unit of measurement for this property.

... more about "Wolffia borealis"
40 +, 30 +, 22 +  and 20 +
Elias Landolt +
(Engelmann) Landolt +
Wolffia brasiliensis var. borealis +
small green +
Wolffie boréale +
Alta. +, B.C. +, Ont. +, Que. +, Calif. +, Colo. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.H. +, N.Y. +, Ohio +, Okla. +, Oreg. +, Pa. +, S.Dak. +, Tenn. +, Utah +, Vt. +, Wash. +  and Wis. +
0–1400 m +
coherent +
submersed +  and floating +
2 +  and 1 +
boat-shaped +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
not differentiated +
Mesotrophic to eutrophic, quiet waters in temperate regions +
tapering +  and bottle--shaped +
Flowering (very rare) summer–early fall. +
Ber. Geobot. Inst. ETH Stiftung Rubel +
Weedy +, Illustrated +  and Endemic +
distinct +
funnel--shaped +
Wolffia borealis +
species +
light green +
globular +
smaller +
submersed +  and floating +
23 +, 22 +, 21 +, 20 +  and 10 +