• Naturalization and invasion of alien plants:concepts and definitions. Richardson et al. 2000. Diversity and Distributions. v. 6, pp. 103-107. Also in the ConsultantsReport
• Invasive Plant Pests Definitions and Criteria from the NBII. A compilation from several sources.

The terminology is distinctly different here. Though these article are older, the vocabulary (at least archaeophyte and neophyte) is certainly still in use:

• Recent plant invasions in the Circum-Mediterranean region. Quezel et al. 1990. pp. 51-60 in Biological Invasions in Europe and the Mediterranean Basin, ed. by di Castri et al.
• Plant Invasions in Central Europe: historical and ecological aspects. Kornas, J. 1990. pp. 19-36 in Biological Invasions in Europe and the Mediterranean Basin, ed. by Biological Invasions in Europe and the Mediterranean Basin.

-- JenniferForman? - 15 Mar 2006

Additional terminology sources from the ConsultantsReport:

• Colautti, R.I. & MacIsaac, H.J. (2004) A neutral terminology to define 'invasive' species. Diversity and Distributions, 10, 135–141.