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Compilation
Polygonum nuttallii

4 Images see all

Lectotype of Polygonum intermedium Nuttall ex S. Watson [family POLYGONACEAE]
Isolectotype of Polygonum nuttallii Small [family POLYGONACEAE]
Isosyntype of Polygonum nuttallii Small [family POLYGONACEAE]
Syntype of Polygonum intermedium Nuttall ex S. Watson [family POLYGONACEAE]
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Name

Identification
Polygonum nuttallii Small [family POLYGONACEAE ] (stored under name); Verified by W. T. Kittredge, 2009 Polygonum intermedium Nuttall ex S. Watson [family POLYGONACEAE ] Verified by Nutt. ex. S. Watson, 1882 Polygonum intermedium Nuttall ex S. Watson [family POLYGONACEAE ] Verified by Not on Sheet, Polygonum douglasii Greene [family POLYGONACEAE ] Verified by M. Costea, 2002
Related name
  • Polygonum nuttallii
  • Polygonum douglasii
  • Polygonum intermedium
Common name
  • Nuttall’s knotweed, Flora of North America Vol. 5

Flora

Entry for Polygonum nuttallii Small [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 nuttallii Small [family POLYGONACEAE], Mongr. Amer. Sp. Polygonum, 132, plate 53. 1895
Polygonum intermedium Nuttall ex S. Watson [family POLYGONACEAE], Proc. Amer. Acad. Arts, 17: 378. 1882,. not Ehrhart 1791
Polygonum douglasii Greene subsp. nuttallii (Small) J. C. Hickman [family POLYGONACEAE]
Treatment Author(s)
Mihai Costea
François J. Tardif
Harold R. Hinds†
Information
Herbs. Stems spreading to erect, sometimes zigzagged, purplish, simple or branched, wiry, (5–)10–35 cm, papillose-scabridulous. Leaves evenly distributed or crowded at branch tips, articulated to ocreae, basal leaves persistent, distal leaves gradually reduced to bracts; ocrea 3–4 mm, papillose-scabridulous, proximal part funnelform, distal part finely lacerate; petiole 0.1–2 mm; blade 1-veined, not pleated, linear to narrowly oblong-elliptic, 8–30 × 1–4(–7) mm, margins narrowly revolute, never touching along midrib, smooth, apex acute, mucronate, ± glaucous adaxially. Inflorescences axillary and terminal, spikelike, dense; cymes mostly congested toward tips of branches, 2–3-flowered. Pedicels enclosed in ocreae, erect to spreading, 2–3 mm. Flowers semi-open or closed; perianth 1.8–2.4 mm; tube 25–33% of perianth length; tepals overlapping, greenish, white, or pink with pink margins, petaloid, oblong, cucullate, navicular in distal 1/4, apex rounded; midveins unbranched; stamens 8. Achenes enclosed in perianth, black, elliptic to ovate, 1.8–2.3 mm, faces subequal, shiny, smooth.
Phenology
may (spring), jun-aug (summer), sep-oct (fall)
Altitude range
800–1100 m;
Distribution
USA Oreg.USA Wash.Canada B.C.
Discussion
C. L. Hitchcock (1964) suggested that Polygonum nuttallii is but a small-flowered form of P. spergulariiforme. Although morphologically similar, P. nuttallii differs from P. spergulariiforme in some respects, including its wiry, purplish stems, short and funnelform ocreae, adaxially glaucous leaves, longer bracts, shorter fruiting perianth, and achenes.

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