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

Zosterella dubia (Jacq.) Small
water star-grass (water star-weed)
Pontederiaceae (Water-Hyacinth family)

Introduction to Vascular Plants

© Curtis Bjork  Email the photographer   (Photo ID #15762)

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Distribution of Zosterella dubia
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Species Information

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Perennial, aquatic herb from slender roots, rooting at the nodes; stems flaccid, usually submerged, 30-100 cm long.
Stem leaves linear, alternate, 7-15 cm long, (1) 2-5 mm wide, the tips rounded; stipules membranous.
Inflorescence of solitary, terminal, pale yellow flowers emerging from an axillary tubular bract (spathe); perianth tubes slender, 2-4 cm long; perianth segments (tepals) linear, about 5 mm long; stamens 3, slightly shorter than the perianth segments.
Capsules; seeds numerous, many-ribbed.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Ponds, lakeshores and slow-moving streams in the steppe and montane zones; infrequent in SW and SC BC; disjunct to MB and E to PQ and S to ME, MA, PA, NC, FL, MS, LA, TX, NM, AZ, MX and CA; S America.

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

Heteranthera dubia (Jacq.) MacMill.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References