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Several species of the genus Myriophyllum grow in nuisance proportions in parts of British Columbia. One, M. spicatum, is a major problem and is already the subject of extensive attempts at control. In order to be able to separate treatment effects from natural changes and to identify the most effective time for treatments, it is necessary to understand the natural yearly growth cycle of the plants. This report presents the results of a study on Myriophyllum species of southwestern British Columbia over a period of 16 months. Each species was observed in at least one site, generally several times a month, for the duration of the study. At each visit, water temperatures were measured and notes were made on the condition of the plants. The presence or absence of turions, inflorescences, flowers and fruits, and the amount and vigour of vegetative growth were recorded. This information about the state of growth of each species was plotted along with water temperature and the photoperiod of the site, against time.
Warrington, P.D.. 1983. Introduction to the Life Histories of Myriophyllum Species in Southwestern British Columbia. BC Ministry of Environment
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Keywords: myriophyllum, life histories, introduction
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