Reynoutria japonica

Species:Reynoutria japonica Houtt.
Plant Notes:Reynoutria sachalinensis and R. x bohemica are very similar and difficult to distinguish from R. japonica (Freeman & Hinds in FNA, vol. 5).
Status:Not Native, UPL (NWPL)
Specimen: View details of USF Herbarium specimens

** Not applicable or data not available.


Sub Class
Genus Reynoutria
Species Reynoutria japonica Houtt. - JAPANESE KNOTWEED


Citation REYNOUTRIA JAPONICA Houttuyn, Nat. Hist. 2(8): 640, t. 51(1). 1777.
Basionym: **
Type: JAPAN:

** Not applicable or data not available.


CountyHerbariaLiterature Citation (If Applicable)
Santa Rosa USF  


– Denotes synonyms that are applicable to the state. Show these synonyms only

SynonymFull CitationBasionymType
Fallopia japonica Fallopia japonica (Houttuyn) Ronse Decraene, Bot. J. Linn. Soc. 98: 369. 1988.BASIONYM: Reynoutria japonica Houttuyn 1777. 
Polygonum japonicum Polygonum japonicum (Houttuyn) S. L. Welsh, Utah Fl., ed. 4. 594. 2008, non Meisner 1856.BASIONYM: Reynoutria japonica Houttuyn 1777. 
Tiniaria japonica Tiniaria japonica (Houttuyn) Hedberg, Svensk Bot. Tidskr. 40: 299. 1946.BASIONYM: Reynoutria japonica Houttuyn 1777. 
Fallopia japonica var. compacta Fallopia japonica (Houttuyn) Ronse Decraene, var. compacta (Hooker f.) J. P. Bailey, Watsonia 17: 443. 1989.BASIONYM: Polygonum compactum Hooker f. 1880. 
Pleuropterus cuspidatus Pleuropterus cuspidatus (Siebold & Zuccarini) H. Gross, Beih. Bot. Centralbl. 37(2): 114. 1919.BASIONYM: Polygonum cuspidatum Siebold & Zuccarini 1846. 
Pleuropterus zuccarinii Pleuropterus zuccarinii Small, in Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 1: 676. 1913, nom. illegit.BASIONYM: Polygonum zucarinii Small 1895, nom. illegit.; Polygonum cuspidatum Siebold & Zuccarini 1846. 
Polygonum compactum Polygonum compactum Hooker f., Bot. Mag. 106: t. 6476. 1880. TYPE: JAPAN:
Polygonum cuspidatum Polygonum cuspidatum Siebold & Zuccarini, Abh. Math.-Phys. Cl. Königl. Bayer. Akad. Wiss. 4: 208. 1846. TYPE: JAPAN:
Polygonum cuspidatum var. compactum Polygonum cuspidatum Siebold & Zuccarini, var. compactum (Hooker f.) L. H. Bailey, Hortus 483. 1930.BASIONYM: Polygonum compactum Hooker f. 1880. 
Polygonum sieboldii Polygonum sieboldii de Vriese, in L. H. Bailey, Cycl. Amer. Hort. 3: 1393. 1901, nom. illegit. et non Meisner 1856.BASIONYM: Polygonum cuspidatum Siebold & Zuccarini 1846. 
Polygonum zuccarinii Polygonum zuccarinii Small, Mem. Dept. Bot. Columbia Coll. 1: 158. 1895, nom. illegit.BASIONYM: Polygonum cuspidatum Siebold & Zuccarini 1846. 
Reynoutria japonica var. compacta Reynoutria japonica Houttuyn, var. compacta (Hooker f.) Moldenke, Bull. Torrey Bot. Club 68: 675. 1941.BASIONYM: Polygonum compactum Hooker f. 1880. 


Country State County Date Specimen Notes Image
USA Florida Alachua Co. July 1982 W. S. Judd s.n. CULTIVATED.
USA California Sonoma Co. 21 Oct 1974 E. McClintock s.n. CULTIVATED.
USA Illinois Champaign Co. 13 Sep 2000 S. R. Hill 33179 CULTIVATED.
USA Florida Santa Rosa Co. 18 Apr 2015 J. R. Burkhalter 25288
USA Pennsylvania Philadelphia Co. 28 Jun 1944 B. Long 61178
USA Connecticut New London Co. 07 Aug 1991 S. R. Hill 22507
USA Ohio Athens Co. 20 Jul 2014 A. R. Franck 3430
USA New York Erie Co. 11 Sep 2003 S. R. Hill 35457
USA Kentucky Rowan Co. 01 Jul 1961 E. M. Browne 4399
USA Virginia 27 Sep 1981 L. Abbott 208
USA Illinois Kendall Co. 01 Sep 2005 S. R. Hill 36676
USA New Jersey Cape May Co. 20 Sep 1919 L. Griscom 4987
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