Vascular Plants of North Carolina
Account for Scarlet Smartweed - Persicaria coccinea   (Muhlenberg) Greene
Members of Polygonaceae:
Members of Persicaria with account distribution info or public map:
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Section 6 » Family Polygonaceae
Author(Muhlenberg) Greene
DistributionWeakley (2020) has split this taxon out from P. amphibia. There appear to be only a few collections in SERNEC, from Avery and Halifax counties. The range in the state is uncertain currently.

A Northeastern species, ranging south to NC, TN, and AR.
AbundanceVery rare if still present.
Habitat"Shores, streams, sluggish water" (Weakely 2020).
PhenologyFlowers and fruits from June to October.
IdentificationSee Weakley (2020).
Taxonomic CommentsThis is a member of the P. amphibia complex, according to Weakley (2020).

Many species formerly treated in the genus Polygonum have been moved to Persicaria, the smartweeds. These are generally erect and tall plants with terminal and axillary floral spikes; most occur in wetlands. Others remain in Polygonum, the knotweeds, which are generally prostrate to ascending and with inconspicuous axillary flowers. They occur mostly in dry soils and tend to be weedy.

Attention must be paid to the small collars at the junction of the main stem and leaf stems (called ocreae) and whether they possess terminal hairs or bristles. Some keys also refer to the even smaller collars from which flowers emerge (called ocreolae). Another important ID character is the surface of the greenish sepals -- whether smooth or dotted with indentations (punctate).
Other Common Name(s)
State RankS1?
Global RankGNR
State Status[W1]
US Status
USACE-agcp
USACE-emp
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