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Introduction
According to Ceska and Ceska (2010), Cut-leaf water-milfoil is an "Eastern North American species with disjunct occurrences in British Columbia, Washington and Oregon. Recognized by the dark-green stems and foliage. Winter buds not seen."
Species Information
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expanded illustration for this species.
General: Aquatic, either submersed or semiterrestrial perennial; stems rooting in mud, freely branched or becoming much elongated when growing in water.
Leaves: In whorls of 3 to 5 or subverticillate or commonly scattered, to about 3 cm long, the submersed leaves with about 5 or more short or somewhat elongate remote capillary divisions; emersed leaves linear to oblanceolate, comb-like or sharply toothed, to 2 cm long; winter buds absent.
Flowers: Perfect or unisexual in the axils of the emersed leaves; bracteoles bluntly triangular, about 1 mm long; petals purplish, 1.5-2 mm long, rounded above, with a short claw; stamens 4, anthers about 1 mm long.
Fruits: Mericarps, 4, pale, 1.3-1.8 mm long, with flat sides and tiny warts on the dorsal ridges.
Notes: This eastern North American species has been identified based on a fruiting specimen collected by Frank Lomer in Port Coquitlam in 1996. There is a sterile specimen in the Royal British Columbia Museum, collected by J. K. Henry in 1918, that most probably belongs to this species.
There are ten species of Myriophyllum found in the Pacific Northwest (Ceska and Ceska 2010). View a key to the genus Myriophyllum for this region prepared by Oldriska Ceska and Adolf Ceska (BEN #428).
Habitat / Range
Ponds and slough bottoms in the lowland zone; rare in SW BC, known only from the Pitt River area; S to ND, SD, MA, FL and TX.
