View source for Polygonum ramosissimum

{{Treatment/ID
|accepted_name=Polygonum ramosissimum
|accepted_authority=Michaux
|publications={{Treatment/Publication
|title=Fl. Bor.-Amer.
|place=1: 237. 1803
|year=1803
}}
|common_names=Bushy knotweed
|special_status={{Treatment/ID/Special_status
|code=W
|label=Weedy
}}{{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Polygonum;Polygonum sect. Polygonum;Polygonum ramosissimum
|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. Polygonum]]</div><div class="higher-taxon"><small>species</small>[[Polygonum ramosissimum]]</div></div>
|volume=Volume 5
|mention_page=page 547, 549, 550, 552, 553, 560
|treatment_page=page 551
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>yellowish green or bluish green, (dark brown to black after drying in <i></i>subsp.<i> prolificum</i>), heterophyllous or homophyllous. <b>Stems</b> erect, usually profusely branched in distal 1/2, not wiry, 10–100(–200) cm. <b>Leaves</b>: ocrea 6–12(–15) mm, proximal part cylindric, distal part silvery, soon disintegrating into persistent brown fibers; petiole 2–4 mm; blade variable, light yellowish green to bluish green, proximal often caducous, narrowly elliptic, lanceolate, or oblanceolate, rarely ovate, 8–70 × 4–18(–35) mm, margins flat, apex acute to acuminate or obtuse; distal leaves, either overtopping or shorter than or equaling flowers. <b>Inflorescences</b> axillary or axillary and terminal, spikelike; cymes uniformly distributed or crowded toward tips of branches, 2–5-flowered. <b>Pedicels</b> enclosed in or exserted from ocreae, 1–6 mm. <b>Flowers</b> closed; perianth (2–)2.2–3.6(–4) mm; tube 20–38% of perianth length; tepals overlapping, greenish yellow with greenish yellow or yellow, rarely pink or white, margins, petaloid or sepaloid, not keeled, elliptic to oblong, cucullate; midveins thickened or not; stamens 3–6(–8). <b>Achenes</b> enclosed in or exserted from perianth, dark brown, ovate, 3-gonous, 1.6–3.5 mm, faces subequal, concave, apex not beaked, edges straight, shiny or dull, usually smooth to roughened, sometimes uniformly or obscurely tubercled; late-season achenes common, 4–15 mm.</span><!--

-->{{Treatment/Body
|distribution=Alta.;B.C.;Man.;N.B.;N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Mass.;Md.;Mich.;Minn.;Miss.;Mo.;Mont.;N.C.;N.Dak.;N.H.;N.J.;N.Mex.;N.Y.;Nebr.;Nev.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Va.;Vt.;W.Va.;Wash.;Wis.;Wyo.
|discussion=<p>Subspecies 2 (2 in the flora).</p><!--
--><p><i>Polygonum ramosissimum</i> exhibits considerable morphological complexity and is similar in difficulty to the <i>P. aviculare</i> complex. Further research is necessary to understand the infraspecific variability of this species (M. Costea and F. J. Tardif 2003b).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Plants heterophyllous, usually yellowish green when fresh or dried; apices of leaf blades acute to acuminate; pedicels 2.5-6 mm
|[[Polygonum ramosissimum subsp. ramosissimum|Polygonum ramosissimum subsp. ramosissimum]]
|-id=key-0-1
|1
|Plants homophyllous, bluish green when fresh, dark brown or black after drying; apices of leaf blades rounded or obtuse; pedicels 1-2 mm
|[[Polygonum ramosissimum subsp. prolificum|Polygonum ramosissimum subsp. prolificum]]
|}
</div></div><!--

-->{{#Taxon:
name=Polygonum ramosissimum
|authority=Michaux
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Polygonaceae
|distribution=Alta.;B.C.;Man.;N.B.;N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Mass.;Md.;Mich.;Minn.;Miss.;Mo.;Mont.;N.C.;N.Dak.;N.H.;N.J.;N.Mex.;N.Y.;Nebr.;Nev.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Va.;Vt.;W.Va.;Wash.;Wis.;Wyo.
|reference=None
|publication title=Fl. Bor.-Amer.
|publication year=1803
|special status=Weedy;Illustrated;Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V5/V5_1122.xml
|subfamily=Polygonaceae subfam. Polygonoideae
|genus=Polygonum
|section=Polygonum sect. Polygonum
|species=Polygonum ramosissimum
}}<!--

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[[Category:Treatment]]
[[Category:Polygonum sect. Polygonum]]
[[Category:Revised Since Print]]