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

Stuckenia filiformis subsp. filiformis
slender-leaved pondweed (fineleaf pondweed)
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants
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E-Flora BC Static Map
Distribution of Stuckenia filiformis subsp. filiformis
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Species Information

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Perennial, aquatic herb from long rhizomes; stems 10-100 cm long, up to 1 mm in diameter, profusely branched at the base.
All submersed, linear, thread-like, 5-10 cm long, 0.2-1.5 mm wide, with 1 vein, thin, green, the tips rounded to blunt, the stipules 0.5-1 cm long, fused, forming a tight sheath around the stem, the leaf blades arising close to the tips of the sheaths.
Inflorescence spikelike, the spikes 1.5-2.5 cm long, interrupted, with 2-8 whorls of flowers, the stalks thin.
Achenes, almost globe-shaped, 2-3 mm long, 1.5-2.4 mm wide, widest above the middle, the beaks and keels absent, the surface with fine, ray-like grooves.
Two subspecies occur in British Columbia. In addition, a third one (ssp. filiformis) can be expected in N BC.

1. Stems 20-100 cm long; stipules inflated at the base, especially in the leaves lower on the stem, disintegrated with age....................ssp. occidentalis (J.W. Robbins) Haynes, D.H. Les, & M. Kral

1. Stems 10-30 cm long; stipules tightly clasping the stem, persistent.

2. Flowers and fruits in whorls less than 4 cm apart; leaves 0.5-1 mm wide....................ssp. alpina (J.W. Robbins) Haynes, D.H. Les, & M. Kral

2. Flowers and fruits in whorls 4 cm or more apart; leaves 0.2-0.5 mm wide....................ssp. filiformis

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Mid Summer
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Calcium-rich lakes in the lowland, steppe and montane zones; frequent E of the Coast-Cascade Mountains, rare along the coast; circumpolar, N to AK, YT and NT, E to NF and S to ME, MA, PA, MI, WI, IA, NE, NM, AZ and CA; Eurasia, Australia.

Source: The Illustrated Flora of British Columbia


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

Coleogeton filiformis (Pers.) D.H. Les & Haynes

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References