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

Callitriche heterophylla var. bolanderi Pursh (Hegelm.) Calder & Roy L. Taylor
diverse-leaved water-starwort
Plantaginaceae (Mare's-tail family)
(Previously in Callitrichaceae)

Introduction to Vascular Plants

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Distribution of Callitriche heterophylla var. bolanderi
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Species Information

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Illustration Source: The Illustrated Flora of British Columbia

General:
Aquatic or semi-aquatic perennial rooting in mud; stems leafy, 2-40 cm long, with or without small membranous ridges between the leaf-bases.

Leaves:
All opposite; submerged leaves linear, single-veined, notched at the tip, 5-25 mm long; floating and emergent leaves broadly egg-shaped or oblanceolate, 3-veined, up to 1 cm wide.

Flowers:
Inflorescence of tiny, inconspicuous flowers borne with a pair of tiny bracts, stalkless or shortly-stalked; styles 1-5 mm long, ascending.

Fruits:
Achene-like, 4, each 1-seeded, wingless or scarcely wing-margined, rounded, egg-shaped or heart-shaped, irregularly pitted.

Notes:
Two subspecies occur in our region.

1. Fruits egg-shaped or slightly heart-shaped in outline, broadest above the middle; submersed leaves usually wider than the stem; plants long-stemmed........................ ssp. bolanderi (Hegelm.) Calder & Tayl.

1. Fruits usually more nearly round or egg-shaped in outline; submersed leaves much narrower than the flattened stem; plants short-stemmed....................... ssp. heterophylla

Source: The Illustrated Flora of British Columbia

Habitat / Range

Shallow ponds, slow-moving streams and shorelines in the lowland and montane zones; ssp. bolanderi- frequent on S Vancouver Island, rare in SE BC, ssp. heterophylla - rare in coastal BC; N to AK, YT, NT, E to NF and S to GA, TX, OK and CA; South America (ssp. bolanderi).

Source: The Illustrated Flora of British Columbia

Status Information

Scientific Name	Origin Status	Provincial Status	BC List (Red Blue List)	COSEWIC
Callitriche heterophylla var. bolanderi	Native	S4S5	Yellow	Not Listed
Callitriche heterophylla var. heterophylla	Native	SU	Unknown	Not Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer, the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Callitriche bolanderi Hegelm.

Taxonomic and Nomenclatural Links

Genetic information (NCBI Taxonomy Database)
International Plant Names Index
Taxonomic Information from the World Flora Online
Integrated Taxonomic Information System

Additional Range and Status Information Links

Burke Museum of Natural History (Washington State records)
CalFlora
Consortium of Pacific Northwest Herbaria records
Jepson Interchange
NatureServe Explorer

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
Google Image Search
Flickr Image Search

General References

Google Scholar Search
Family References
General Botanical References for BC

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-05-08 4:52:36 PM ]

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