Details about map content are available here Click on the map dots to view record details.
Introduction
Ceska and Ceska (2010) say the following about this species: "Circumpolar species. Occurs sporadically throughout Canada, Pacific Northwest, and NE parts of the USA. Stems and leaves green, leaves often with "myriophylloid glands" at the base of the lowermost segments. Winter buds frequent, clavate."
Species Information
Click on the image below to view an
expanded illustration for this species.
General: Perennial aquatic from creeping rhizome, wholly submersed, or with the spike and upper leaves sometimes emersed; stems simple or with a few elongate branches up to 250 cm long.
Leaves: In whorls of 4 or 5; submersed leaves to 45 mm long, with 9 to 13 opposite or alternate pairs of flacid capillary segments to 28 mm long; emersed leaves and bracts smaller and with coarser divisions or merely comb-like pinnate; winter buds well developed at the end of the growing season, 1-4 cm long, club-shaped, broadest at the top.
Flowers: In whorls of 4-6, perfect or the lower ones female and the upper male; bracteoles minute, palmately 7-lobed, about 0.5 mm long; petals spoon-shaped or rudimentary in female flowers, obtuse, about 2.5 mm long; stamens 8, about 2 mm long.
Fruits: Mericarps nearly round, 2-2.5 mm long, glabrous or more or less with tiny warts, rounded on back.
Notes: Mistakenly treated as a synonym of "Myriophyllum spicatum var. spicatum."in Hitchcock et al. (1961).
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
Lakes and sloughs of the lowland to montane zones; frequent throughout BC; circumpolar, N to AK and YT, E to NF, and S to FL, MN, UT, and CA; Eurasia.
Ecological Framework for Myriophyllum verticillatum
The table below shows the species-specific information calculated from original data (BEC database) provided by the BC Ministry of Forests and Range. (Updated August, 2013)
