View source for Polygonum cascadense

{{Treatment/ID
|accepted_name=Polygonum cascadense
|accepted_authority=W. H. Baker
|publications={{Treatment/Publication
|title=Madroño
|place=10: 62, plate 1, fig. 1. 1949
|year=1949
}}
|common_names=Cascade knotweed
|basionyms=
|synonyms=
|hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Polygonum;Polygonum sect. Duravia;Polygonum cascadense
|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 cascadense]]</div></div>
|volume=Volume 5
|mention_page=page 561, 562
|treatment_page=page 571
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs.</b> Stems spreading to erect, zigzagged, green, simple or branched from base, wiry, 5–12(–15) cm, glabrous. <b>Leaves</b> uniformly distributed, articulated to ocreae, basal leaves persistent, distal leaves abruptly reduced to bracts; ocrea 2–5 mm, glabrous, proximal part funnelform, distal part lacerate; petiole essentially absent; blade 1-veined, not pleated, oblanceolate to obovate, 5–20 × 2–5 mm, margins revolute, never touching along midrib, sparsely papillose-denticulate, apex rounded or apiculate. <b>Inflorescences</b> axillary and terminal, spikelike, dense; cymes congested at tips of stems and branches, 3–5-flowered. <b>Pedicels</b> enclosed in ocreae, erect to spreading, 2–3 mm. <b>Flowers</b> open; perianth 2–2.5 mm; tube 12–25% of perianth length; tepals overlapping, uniformly white, petaloid, oblong to obovate, cucullate, navicular in distal 1/4, apex rounded; midveins unbranched; stamens 8. <b>Achenes</b> enclosed in or exserted from perianth, black, ovate to ovate-oblong, 1.8–2.1 mm, faces subequal, shiny, smooth.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jun–Sep.
|habitat=Dry, usually rocky slopes, often on serpentine
|elevation=1600-1800 m
|distribution=Oreg.
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Polygonum cascadense
|author=
|authority=W. H. Baker
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Polygonaceae
|phenology=Flowering Jun–Sep.
|habitat=Dry, usually rocky slopes, often on serpentine
|elevation=1600-1800 m
|distribution=Oreg.
|reference=None
|publication title=Madroño
|publication year=1949
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V5/V5_1170.xml
|subfamily=Polygonaceae subfam. Polygonoideae
|genus=Polygonum
|section=Polygonum sect. Duravia
|species=Polygonum cascadense
}}<!--

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