View source for Polygonum heterosepalum

{{Treatment/ID
|accepted_name=Polygonum heterosepalum
|accepted_authority=M. Peck & Ownbey
|publications={{Treatment/Publication
|title=Madroño
|place=10: 250. 1950
|year=1950
}}
|common_names=Dwarf desert knotweed
|basionyms=
|synonyms=
|hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Polygonum;Polygonum sect. Duravia;Polygonum heterosepalum
|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 heterosepalum]]</div></div>
|volume=Volume 5
|mention_page=page 548, 561, 562
|treatment_page=page 563
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> compact, often cushion-like. <b>Stems</b> erect, green or reddish, simple or branched near base, not wiry, 1.5–5 cm, glabrous. <b>Leaves</b> uniformly distributed, dense, not articulated to ocreae, basal leaves persistent or caducous, distal leaves gradually reduced to bracts; ocrea 3–6 mm, glabrous, proximal part cylindric, distal part disintegrating almost to base, with whitish, straight, rigid fibers; petiole absent; blade 3-veined, without pleats, linear to lanceolate, 10–20 × 0.6–2.7 mm, margins revolute, smooth, apex spine-tipped. <b>Inflorescences</b> axillary; cymes in most axils, 2–3-flowered. <b>Pedicels</b> enclosed in ocreae, erect, 0.1–1 mm. <b>Flowers</b> closed; perianth 2.3–2.7 mm; tube 3–7% of perianth length; tepals overlapping, whitish with whitish or pink margins, petaloid, oblong, navicular, dimorphic, outer 2 shorter than inner 3, outer 2 0.8–1.2 mm, inner 2.3–2.7 mm, papillose at base, apex acute or acuminate; midveins unbranched; stamens 5–6. <b>Achenes</b> enclosed in perianth, olive brown, narrowly ovate to ovate-lanceolate, 1.5–2 mm, faces subequal, shiny, smooth.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jun–Aug.
|habitat=Dry waste ground, open flats in sagebrush plains, ponderosa pine forests
|elevation=1000-1500 m
|distribution=Idaho;Nev.;Oreg.
|discussion=<p>Of conservation concern.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Polygonum heterosepalum
|author=
|authority=M. Peck & Ownbey
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Polygonaceae
|phenology=Flowering Jun–Aug.
|habitat=Dry waste ground, open flats in sagebrush plains, ponderosa pine forests
|elevation=1000-1500 m
|distribution=Idaho;Nev.;Oreg.
|reference=None
|publication title=Madroño
|publication year=1950
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V5/V5_1150.xml
|subfamily=Polygonaceae subfam. Polygonoideae
|genus=Polygonum
|section=Polygonum sect. Duravia
|species=Polygonum heterosepalum
}}<!--

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