Wolffia arrhiza

(Linnaeus) Horkel ex Wimmer

Fl. Schles., ed. 3 140. 1857

Basionyms: Lemna arrhiza Linnaeus Mant. Pl. 2: 294. 1771
Treatment appears in FNA Volume 22. Treatment on page 152.
Click plate for higher resolution version.
Illustrator: John Myers
Fronds globular to ovoid, 0.5–1.5 mm, 1–1.3 times as long as wide, 1.2–1.5 times as deep as wide, slightly pointed at apex, papilla absent; upper surface intensely green (not transparent), with 10–100 stomates; pigment cells absent in vegetative tissue. 2n = 30, 40, 42, 44–46, 50, 60, 62 (Europe, Africa).

Phenology: Flowering (very rare) late spring–summer.
Habitat: Mesotrophic to eutrophic, quiet waters in temperate to subtropical regions with relatively mild winters
Elevation: 0–800 m

Distribution

V22 271-distribution-map.jpg

Calif., South America (Brazil), w Eurasia, Africa.

Discussion

Wolffia arrhiza was reported from Alberta because of the size of epidermal cells (G. C. D. Griffiths 1988). The plants are within the variation shown by W. columbiana, however.

References

None.

Lower Taxa

No lower taxa listed.

Facts about "Wolffia arrhiza"
AuthorElias Landolt +
Authority(Linnaeus) Horkel ex Wimmer +
BasionymsLemna arrhiza +
DistributionCalif. +, South America (Brazil) +, w Eurasia + and Africa. +
Elevation0–800 m +
HabitatMesotrophic to eutrophic, quiet waters in temperate to subtropical regions with relatively mild winters +
IllustratorJohn Myers +
Introducedtrue +
PhenologyFlowering (very rare) late spring–summer. +
Publication titleFl. Schles., ed. 3 +
Publication year1857 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V22/V22 271.xml +
Taxon familyLemnaceae +
Taxon nameWolffia arrhiza +
Taxon parentWolffia +
Taxon rankspecies +
VolumeVolume 22 +