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Cut-and-Paste Reference:
European and Mediterranean Plant Protection Organization (EPPO). 2014. PM 9/19 (1) Invasive alien aquatic plants. European and Mediterranean Plant Protection Organization Bulletin 44(3):457-471. https://doi.org/10.1111/epp.12165.
Reference Details:
Reference Number: 29351
Type: Journal Article
Author: European and Mediterranean Plant Protection Organization (EPPO)
Date (year): 2014
Article Title:PM 9/19 (1) Invasive alien aquatic plants 
Journal Name: European and Mediterranean Plant Protection Organization Bulletin
Volume: 44
Issue: 3
Pages: 457-471
URL:
Keywords: Crassula helmsii, New Zealand pygmyweed, swamp stonecrop, invasive alien aquatic plants, control
DOI: 10.1111/epp.12165
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Citation information: U.S. Geological Survey. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [1/13/2026].

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