View source for Polygonum nuttallii

{{Treatment/ID
|accepted_name=Polygonum nuttallii
|accepted_authority=Small
|publications={{Treatment/Publication
|title=Mongr. Amer. Sp. Polygonum,
|place=132, plate 53. 1895
|year=1895
}}
|common_names=Nuttall’s knotweed
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms={{Treatment/ID/Basionym
|name=Polygonum intermedium
|authority=Nuttall ex S. Watson
|rank=species
|publication_title=Proc. Amer. Acad. Arts
|publication_place=17: 378. 1882,
}}
|synonyms={{Treatment/ID/Synonym
|name=Polygonum douglasii subsp. nuttallii
|authority=(Small) J. C. Hickman
|rank=subspecies
}}
|hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Polygonum;Polygonum sect. Duravia;Polygonum nuttallii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polygonaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Polygonaceae subfam. Polygonoideae]]</div><div class="higher-taxon"><small>genus</small>[[Polygonum]]</div><div class="higher-taxon"><small>section</small>[[Polygonum sect. Duravia]]</div><div class="higher-taxon"><small>species</small>[[Polygonum nuttallii]]</div></div>
|volume=Volume 5
|mention_page=page 561, 562, 568
|treatment_page=page 570
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs.</b> Stems spreading to erect, sometimes zigzagged, purplish, simple or branched, wiry, (5–)10–35 cm, papillose-scabridulous. <b>Leaves</b> 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. <b>Inflorescences</b> axillary and terminal, spikelike, dense; cymes mostly congested toward tips of branches, 2–3-flowered. <b>Pedicels</b> enclosed in ocreae, erect to spreading, 2–3 mm. <b>Flowers</b> 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. <b>Achenes</b> enclosed in perianth, black, elliptic to ovate, 1.8–2.3 mm, faces subequal, shiny, smooth.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Oct.
|habitat=Dry prairies, open knolls in lower mountains, open sites in lowland and montane zones, sandy soil
|elevation=800-1100 m
|distribution=B.C.;Oreg.;Wash.
|discussion=<p>C. L. Hitchcock (1964) suggested that <i>Polygonum nuttallii</i> is but a small-flowered form of <i>P. spergulariiforme</i>. Although morphologically similar, <i>P. nuttallii</i> differs from <i>P. spergulariiforme</i> in some respects, including its wiry, purplish stems, short and funnelform ocreae, adaxially glaucous leaves, longer bracts, shorter fruiting perianth, and achenes.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Polygonum nuttallii
|authority=Small
|rank=species
|parent rank=section
|synonyms=Polygonum douglasii subsp. nuttallii
|basionyms=Polygonum intermedium
|family=Polygonaceae
|phenology=Flowering May–Oct.
|habitat=Dry prairies, open knolls in lower mountains, open sites in lowland and montane zones, sandy soil
|elevation=800-1100 m
|distribution=B.C.;Oreg.;Wash.
|reference=None
|publication title=Mongr. Amer. Sp. Polygonum,
|publication year=1895
|special status=Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V5/V5_1167.xml
|subfamily=Polygonaceae subfam. Polygonoideae
|genus=Polygonum
|section=Polygonum sect. Duravia
|species=Polygonum nuttallii
}}<!--

-->[[Category:Treatment]][[Category:Polygonum sect. Duravia]]