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Cut-and-Paste Reference:
Dawson, F.H., and E.A. Warman. 1987. Crassula helmsii (T. Kirk) Cockayne: Is it an aggressive alien aquatic plant in Britain? Biological Conservation 42(4):247-272. https://doi.org/10.1016/0006-3207(87)90071-1.
Reference Details:
Reference Number: 29340
Type: Journal Article
Author: Dawson, F.H., and E.A. Warman
Date (year): 1987
Article Title:Crassula helmsii (T. Kirk) Cockayne: Is it an aggressive alien aquatic plant in Britain?
Journal Name: Biological Conservation
Volume: 42
Issue: 4
Pages: 247-272
URL:
Keywords: Crassula helmsii, New Zealand pygmyweed, swamp stonecrop
DOI: 10.1016/0006-3207(87)90071-1
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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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