Jepson Flora Project: Jepson Interchange for California Floristics    
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Fallopia japonica (Houtt.) Ronse Decr.

Information from the Index of California Plant Names (ICPN)
Current Jepson Flora Project Synonyms Reynoutria japonica Houtt.; Polygonum cuspidatum Siebold & Zucc.; Tiniaria japonica (Houtt.) Hedberg
Initial Editorial Analysis 17 Jan 2006
Notes on Authorship of Name both = Authors of Plant Names
Source of Report for California Correspondence 1
Correspondence and Comments Subsequent to Initial Analysis
Correspondence 1 4 Oct 2004 e-mail from Barbara Ertter, including forwarded 30 Sep 2003 e-mail to Barbara Ertter from Dean Taylor see Comment 1
Editorial Comments 1 Correspondence 1 indicates that, in response to a query from Ertter to Taylor about Polygonum cuspidatum (Japanese knotweed), which Taylor refers to as Fallopia japonica, Taylor reported that the taxon appears to no longer occur at a number of locations from which it has been reported, and suggests that it occurs presently in California only as a waif.
Correspondence 2 5 Oct 2004 e-mail from Jeff Greenhouse see Comment 2
Editorial Comments 2 Correspondence 2 indicates that Louis-Philippe Ronse Decraene and J.R. Akeroyd, in Bot. J. Linn. Soc. 98:369 (1988) published the combination Fallopia japonica (Houtt.) Ronse Decr. based on Reynoutria japonica Houtt. (Handl. Regn. Veg., 8:639 t. 51 F. 1, 1777), and listing Polygonum cuspidatum Siebold & Zucc. as a taxonomic synonym.
Correspondence 3 Treatment submitted for The Jepson Manual [Ed. 2] by Mihai Costea see Comment 3
Editorial Comments 3 Correspondence 3 indicates that Fallopia japonica (Houttuyn) Ronse Decraene, with no infraspecific taxa, is to be treated as naturalized in California in The Jepson Manual [Ed. 2], with Polygonum cuspidatum Siebold & Zucc. listed as syn.
Editorial Summary and Current Status
Editorial Summary addition, for taxon reported as naturalized in California since The Jepson Manual [Ed. 1]
Current Status JFP-2, accepted name for taxon naturalized in CA
Current Status Authority The Jepson Manual [Ed. 2]
Current Status Date 17 Jan 2006
List of names for this Current Status category
List of ICPN names in Fallopia
List of names from ICPN, Hrusa's Crosswalk, and Jepson Flora in Fallopia

Resources of the Jepson Flora Project: External links:
·Distribution maps: County distribution based on CCH specimens
Manual imageJepson eFlora
link image ·Consortium of California Herbaria specimen records (includes links to BerkeleyMapper)
· Jepson eFlora page with bioregion map and CCH specimen records
Manual imageArchived Indexes from The Jepson Manual (1993; TJM1)
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