E-Flora BC: Electronic Atlas of the Flora of British Columbia

Persicaria hydropiperoides (Michx.) Small
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #7492)

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Distribution of Persicaria hydropiperoides
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Species Information

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Perennial herb from a rhizome; stems ascending to erect, several, simple, rooting freely, 20-100 cm tall.
Basal leaves lacking; stem leaves alternate, lanceolate or oblong-lanceolate, smooth to appressed hairy, the blades 5-12 cm long, slightly reduced upward, the stalks short; stipules 1-2 cm long, appressed hairy and fringed with hairs at the top.
Inflorescence of 2 or sometimes 3, slender, spikelike racemes, 6-10 cm long; perianths greenish to white or pinkish, 2.5-3 mm long, 5-lobed slightly more than 1/2 the distance to the base; stamens 8.
Achenes, 3-angled, brown or black, smooth and shiny, 2.5-3 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet swampy sites, shorelines and shallow water in the lowland zone; rare in SW BC; E to NB and NS and S to FL, TX and MX; S. America.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Persicaria hydropiperoides

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 990 1035 1080
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
7 7 7
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: IDF(2)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Persicaria hydropiperoides var. breviciliata (Fernald) C.F. Reed
Persicaria hydropiperoides var. euronotora (Fernald) C.F. Reed
Persicaria hydropiperoides var. opelousana (Riddell ex Small) J.S. Wilson
Persicaria opelousana (Riddell ex Small) Small
Persicaria paludicola Small
Persicaria persicarioides (Kunth) Small
Polygonum hydropiperoides Michx.
Polygonum hydropiperoides var. adenocalyx (Stanford) Gleason
Polygonum hydropiperoides var. asperifolium Stanford
Polygonum hydropiperoides var. breviciliatum Fernald
Polygonum hydropiperoides var. bushianum Stanford
Polygonum hydropiperoides var. digitatum Fernald
Polygonum hydropiperoides var. euronotorum Fernald
Polygonum hydropiperoides var. hydropiperoides
Polygonum hydropiperoides var. opelousanum (Riddell ex Small) Riddell ex W. Stone
Polygonum hydropiperoides var. psilostachyum H. St. John
Polygonum hydropiperoides var. strigosum (Small) Stanford
Polygonum opelousanum Riddell ex Small
Polygonum opelousanum var. adenocalyx Stanford
Polygonum persicarioides Kunth

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References