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

Callitriche hermaphroditica L.
northern water-starwort
Plantaginaceae (Mare's-tail family)
(Previously in Callitrichaceae)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #30171)

E-Flora BC Static Map
Distribution of Callitriche hermaphroditica
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Species Information

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Aquatic or semi-aquatic perennial rooting in mud; stems slender, 5-15 cm long, with widely spaced internodes.
All opposite; linear, 5-20 mm long, single-nerved, their bases not joined by a ridge or wing, light green.
Inflorescence of tiny, inconspicuous flowers borne without bracts, stalkless or shortly-stalked; styles soon deciduous, ascending.
Achene-like, 4, each 1-seeded, wingless, 1-2 mm long, egg-shaped, irregularly pitted.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Summer
Fruit/Seed characteristics:
Colour: Green
Present over the Fall
Source:  The USDA

Habitat / Range

Slow-moving streams, lakes and sloughs in the lowland, steppe and montane zones; common in SW BC, less frequent in SC and SE BC; circumboreal, N to AK, YT and NT, E to NF and S to MN, MI, NM and CA; Eurasia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Callitriche hermaphroditica

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) 675 675 675
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]
5 5 5
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(1)


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

Callitriche autumnalis L.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References