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

Persicaria maculosa Gray
lady's-thumb
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

© Jim Riley  Email the photographer   (Photo ID #15480)

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Distribution of Persicaria maculosa
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Species Information

General:
Annual herb from a taproot; stems prostrate to erect, solitary, simple or branched, 30-100 cm tall.
Leaves:
Basal leaves lacking; stem leaves alternate, lanceolate, the blades 3-10 cm long, smooth to appressed hairy, usually with a purplish spot near midlength, the stalks short, thick; stipules cylindric-conic, 5-15 mm long, entire, appressed hairy, fringed with bristly hairs at the tips.
Flowers:
Inflorescence of many flowers in crowded, cylindric, compound racemes; perianths pink or purplish, rarely white, 1.5-3.5 mm long, 5-lobed nearly to the base.
Fruits:
Achenes, 3-angled or lens-shaped, 2-3 mm long, egg-shaped to roundish, nearly black, smooth, shiny.
Notes:
Sometimes difficult to separate from P. hydropiperoides.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry roadsides, ditches, fields and waste places in the lowland, steppe and montane zones; common in SW BC, infrequent in SC and SE BC, rare northward along the coast; introduced from Eurasia.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Persicaria maculosa

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

Minimum

Average

Maximum

Elevation (metres) 350 837 1126
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
7 7 8
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
3
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: BG(1), IDF(2)

Climate

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 maculata (Raf.) S.F. Gray
Polygonum persicaria L.

Taxonomic and Nomenclatural Links

Additional Photo Sources

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General References