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

Myriophyllum hippuroides Nutt. ex Torr. & A. Gray
western water-milfoil (western watermilfoil)
Haloragaceae (Water Milfoil family)

Introduction to Vascular Plants
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Distribution of Myriophyllum hippuroides
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Introduction

According to Ceska and Ceska (2010): "Western Water-Milfoil occurs from California to the Lower Fraser Valley in British Columbia; there it forms dense stands in sloughs of the Fraser River and its tributaries. Easily recognized by deep green colour, dense foliage with additional numerous leaves outside the whorls. Winter buds absent. "

Species Information

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General:
Perennial aquatic from a short rhizome; stems stout, olive green, 2-3 mm wide, 60-120 cm long.
Leaves:
In whorls of 4 to 6, with some additional alternate leaves scattered outside the whorls; emersed leaves linear, the lower ones pinnately dissected into capillary divisions, the upper ones deeply sharp-toothed or entire; winter buds absent.
Flowers:
Perfect or the lower ones female and upper ones male; bracteoles minute, not more than 0.7 mm long; petals white, 1-2 mm long; stamens 4.
Fruits:
Mericarps, 4, laterally compressed, 1.5-2 mm long, with smooth dorsal ridges.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes and sloughs in the lowland zone; infrequent in SW BC, known only from the lower Fraser River Valley; S to WA, CA and MX.

Source: The Illustrated Flora of British Columbia

Climate

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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Species References

Ceska, Oldriska and Adolf Ceska. 2010. Genus Myriophyllum (Haloragaceae) in the Pacific Northwest. Botanical Electronic News #428. Available online.

General References