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

Isoetes occidentalis L.F. Hend.
western quillwort
Isoetaceae (Quillwort family)

Introduction to Vascular Plants
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Distribution of Isoetes occidentalis
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Species Information

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Perennial aquatic plants from a short, 2-lobed rootstock.
Deciduous, stiff, 3-25 cm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes in the lowland, steppe and montane zones; frequent in S BC; S to CO, UT and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Isoetes occidentalis

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) 1960 1960 1960
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]
6 6 6
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: ESSF(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

Isoetes flettii (A.A. Eaton) N.E. Pfeiffer
Isoetes lacustris L.
Isoetes lacustris subsp. paupercula (Engelm.) J. Feilberg
Isoetes lacustris var. paupercula Engelm.
Isoetes paupercula (Engelm.) A.A. Eaton
Isoetes piperi A.A. Eaton

Taxonomic and Nomenclatural Links

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General References