Pollen morphology of some western Canadian Myriophyllum species in relation to taxonomy

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Abstract
The pollen morphology of four species of Myriophyllum from northwestern North American populations is described from studies using bright-field, interference-contrast, and scanning electron microscopy. Results indicate that M. verticillatum, M. heterophyllum, and M. hippuroides can be determined to species on the basis of pollen morphology. Myriophyllum spicatum and M. exalbescens are not readily separated on pollen morphology, although two tentative differences are suggested for further testing. It is also concluded that M. verticillatum should be recognized as a species clearly distinct from M. spicatum.

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