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THE INTRODUCTION AND SPREAD OF VERONICA BECCABUNGA (SCROPHULARIACEAE) IN EASTERN NORTH AMERICA

Donald H. Les and Ronald L. Stuckey
Rhodora
Vol. 87, No. 852 (October 1985), pp. 503-515
Stable URL: http://www.jstor.org/stable/23314568
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
THE INTRODUCTION AND SPREAD OF VERONICA BECCABUNGA (SCROPHULARIACEAE) IN EASTERN NORTH AMERICA
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Abstract

Veronica beccabunga L., indigenous to Eurasia, was introduced into North America toward the latter part of the nineteenth century. Originally confined to the East Coast of the United States, the range of the species has expanded to include seven states and two Canadian provinces. Historical evidence implicates ballast disposal in the initial introduction of the species, although multiple introductions may have occurred. Compared with other non-indigenous aquatic plants, the spread of V. beccabunga has been slower and less conspicuous. Interspecific competition with the native flora may have kept the progress of the species in check. The presently known distribution of V. beccabunga is mapped for North America. The species is dispersed mainly by plant fragments dislodged during periods of high water flow.

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