Compilation
Polygonum caurianum

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Name

Identification
Polygonum humifusum Merk ex C. Koch [family POLYGONACEAE ] (stored under name); Verified by Not on Sheet, Polygonum caurianum B. L. Robinson [family POLYGONACEAE ] Verified by B. L. Rob., 1904 Polygonum aviculare Linnaeus [family POLYGONACEAE ] Verified by Not on Sheet, Polygonum caurianum B. L. Robinson [family POLYGONACEAE ] Verified by H. Hinds (UNB), 1994 Polygonum caurianum B. L. Robinson [family POLYGONACEAE ] Verified by B. L. Robinson, Polygonum humifusum Merk ex C. Koch [family POLYGONACEAE ] Verified by O. V. Yurtseva (MW), 1999
Related name
  • Polygonum caurianum
  • Polygonum humifusum
  • Polygonum aviculare
Common name
  • Alaska knotweed, Flora of North America Vol. 5
  • renouée de la baie d’Hudson, Flora of North America Vol. 5
  • renouée du Nord-Ouest, Flora of North America Vol. 5
  • Hudsonian knotweed, Flora of North America Vol. 5

Flora

Entry for Polygonum fowleri B. L. Robinson subsp. hudsonianum (S. J. Wolf & McNeill) Costea & Tardif [family POLYGONACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 5,
Names
Polygonum fowleri B. L. Robinson subsp. hudsonianum (S. J. Wolf & McNeill) Costea & Tardif [family POLYGONACEAE], Sida, 20: 994. 2003
Polygonum caurianum B. L. Robinson subsp. hudsonianum S. J. Wolf & McNeill [family POLYGONACEAE], Rhodora, 88: 469, fig. 3. 1986
Polygonum hudsonianum (S. J. Wolf & McNeill) H. R. Hinds [family POLYGONACEAE]
Treatment Author(s)
Mihai Costea
François J. Tardif
Harold R. Hinds†
Information
Plants often purplish tinged, homophyllous, rarely subsuc-culent. Stems prostrate, 5–30 cm. Leaves: ocrea 2.5–5 mm; petiole 2–5 mm; blade purple tinged, narrowly obovate or oblanceolate, 8–30 × 4–12(–15) mm, apex rounded to obtuse; middle stem leaves 1.1–1.8(–2.2) times as long as adjacent branch leaves. Cymes 2–7(–10)-flowered. Pedicels 1–1.5 mm. Perianths (2.2–)2.5–3.3(–3.5) mm. Achenes ovate-lanceolate, (2–)3-gonous, (1.8–)2–2.5(–3.1) mm, faces often unequal, ± flat to concave, roughened, rarely obscurely tubercled.
Phenology
jul-aug (summer), sep (fall)
Altitude range
0–30 m;
Distribution
Canada Man.Canada Nfld. and Labr.Canada N.W.T.Canada N.S.Canada NunavutCanada Ont.Canada Que..
Discussion
Wolf and McNeill described Hudsonian knotweed as a subspecies of Polygonum caurianum (P. humifusum subsp. caurianum in this treatment). In raising it to the rank of species, H. R. Hinds (1995) noted that “separation between P. fowleri and P. hudsonianum, however, is more difficult.” M. Costea and F. J. Tardif (2003) concluded that the taxon is best treated as a subspecies of P. fowleri, based on the existence of intermediate plants.

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