Vascular Plants of North Carolina
Account for Common Duckweed - Lemna minor   L.
Members of Lemna with account distribution info or public map:
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Section 5 » Order Arales » Family Araceae
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AuthorL.
DistributionThis species is considered by Weakley (2018) as being present in the Coastal Plain and Piedmont in NC, but not in the mountains. However, his map does show its presence in the mountains of VA and in eastern TN, and the map below does show at least one mountain record. Thus, it is possible that this tiny species could occur roughly statewide, though it is not known from SC in Weakley (2018). Apparently its range is limited essentially to the northern half of the state, as it is absent in SC (as shown on the BONAP map). Website editors have mapped only those specimens that were annotated by experts.

This is a wide-ranging species from Canada south to central US, to NC, TX, and CA, with disjunct records in FL.
AbundanceWeakley (2018) indicates that it is "uncommon" in both the Piedmont and in the Coastal Plain of NC. Based on the NC specimens, it is very rare in the northern Coastal Plain, rare in the northern (at least northeastern) Piedmont, and rare in the northern mountains. The website editors suggest a State Rank of S2? and being on the NCNHP's Watch List.
HabitatIn VA, the habitats are "Quiet water of ditches, streams, marshes, and ponds" (Digital Atlas of the Virginia Flora website).
See also Habitat Account for General Herbaceous Ponds
PhenologySeldom flowers, and then from June to September.
IdentificationLemna species are tiny floating plants with flattened leaf-like stems (fronds) that produce roots under the stem (i.e., under the water surface). These species have just one root per frond. This species has 3-5 nerves on a frond. For further separation characters, see the key in Weakley (2018).
Taxonomic CommentsNone

The range maps for this and other duckweeds (Lemna spp.) are likely to be very incomplete, owing to recent changes in nomenclature; not to mention being in a group of plants often overlooked or not often collected by biologists because of their tiny size and aquatic/floating habits.
Other Common Name(s)None
State Rank[S2?]
Global RankG5
State Status[W7]
US Status
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