View source for Rheum ← Rheum You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=Rheum |accepted_authority=Linnaeus |publications={{Treatment/Publication |title=Sp. Pl. |place=1: 371. 1753: Gen. Pl. ed. 5, 174. 1754 |year=1754 }} |common_names=Rhubarb |basionyms= |synonyms= |hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Rheum |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>[[Rheum]]</div></div> |etymology=Greek rheon, a name used by Dioscorides, probably for a plant in this genus |volume=Volume 5 |mention_page=page 218, 480, 489 |treatment_page=page 488 }}<!-- --><span class="statement" id="st-d0_s0" data-properties="whole_organism duration;whole_organism growth form"><b>Herbs,</b> perennial;</span> <span class="statement" id="st-d0_s1" data-properties="root texture">roots fleshy.</span> <span class="statement" id="st-d0_s2" data-properties="stem orientation;stem pubescence;stem pubescence"><b>Stems </b>erect, glabrous or pubescent.</span> <span class="statement" id="st-d0_s3" data-properties="leaf duration;leaf position;leaf arrangement;leaf architecture"><b>Leaves </b>deciduous, mostly basal, alternate, petiolate;</span> <span class="statement" id="st-d0_s4" data-properties="ocreum duration;ocreum duration;ocreum pubescence or texture">ocrea persistent or deciduous, chartaceous;</span> <span class="statement" id="st-d0_s5" data-properties="blade shape;margin architecture or shape;margin shape">blade cordate-ovate to orbiculate or reniform, margins entire, undulate.</span> <span class="statement" id="st-d0_s6" data-properties="inflorescence position or structure subtype;inflorescence shape;inflorescence architecture"><b>Inflorescences </b>terminal, paniclelike, pedunculate.</span> <span class="statement" id="st-d0_s7" data-properties="pedicel presence"><b>Pedicels </b>present.</span> <span class="statement" id="st-d0_s8" data-properties="flower reproduction;flower quantity;base shape"><b>Flowers </b>bisexual, 1–10 per ocreate fascicle, base stipelike;</span> <span class="statement" id="st-d0_s9" data-properties="perianth size;perianth coloration;perianth coloration;perianth shape;perianth pubescence">perianth nonaccrescent in fruit, whitish green or pinkish green, campanulate, glabrous;</span> <span class="statement" id="st-d0_s10" data-properties="tepal quantity;tepal fusion;tepal architecture;tepal growth form;outer tepal quantity;outer tepal width;inner tepal quantity">tepals 6, distinct, sepaloid, dimorphic, outer 3 narrower than inner 3;</span> <span class="statement" id="st-d0_s11" data-properties="stamen atypical quantity;stamen quantity">stamens (6–) 9;</span> <span class="statement" id="st-d0_s12" data-properties="filament fusion;filament fusion;filament pubescence">filaments distinct, free, glabrous;</span> <span class="statement" id="st-d0_s13" data-properties="anther coloration;anther coloration;anther arrangement or shape">anthers yellow or pinkish, elliptic;</span> <span class="statement" id="st-d0_s14" data-properties="style quantity;style orientation;style orientation;style fusion">styles 3, erect or deflexed, distinct;</span> <span class="statement" id="st-d0_s15" data-properties="stigma architecture or shape">stigmas capitate.</span> <span class="statement" id="st-d0_s16" data-properties="achene position;achene coloration;achene architecture;achene shape;achene pubescence"><b>Achenes </b>exserted, dark-brown, winged, 3-gonous, glabrous.</span> <span class="statement" id="st-d0_s17" data-properties=""><b>Seeds:</b> embryo straight or curved.</span> <span class="statement" id="st-d0_s18" data-properties="embryo course;embryo course;x chromosome quantity">x = 11.</span><!-- -->{{Treatment/Body |distribution=temperate regions;Eurasia |introduced=true |discussion=<p>Species ca. 60 (1 in the flora).</p> |tables= |references={{Treatment/Reference |id=chin1947a |text=Chin, T. C. and H. W. Youngken. 1947. The cytotaxonomy of Rheum. Amer. J. Bot. 34: 401–407. }} }}<!-- --><!-- -->{{#Taxon: name=Rheum |author=Craig C. Freeman |authority=Linnaeus |rank=genus |parent rank=subfamily |synonyms= |basionyms= |family=Polygonaceae |illustrator=Yevonn Wilson-Ramsey |illustration copyright=Flora of North America Association |distribution=temperate regions;Eurasia |introduced=true |reference=chin1947a |publication title=Sp. Pl. |publication year=1754 |special status= |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V5/V5_1018.xml |subfamily=Polygonaceae subfam. Polygonoideae |genus=Rheum |achene architecture=winged |achene coloration=dark-brown |achene position=exserted |achene pubescence=glabrous |achene shape=3-gonous |anther arrangement or shape=elliptic |anther coloration=pinkish;yellow |base shape=stipelike |blade shape=cordate-ovate;orbiculate or reniform |embryo course=curved;straight |filament fusion=free;distinct |filament pubescence=glabrous |flower quantity=1;10 |flower reproduction=bisexual |inflorescence architecture=pedunculate |inflorescence position or structure subtype=terminal |inflorescence shape=paniclelike |inner tepal quantity=3 |leaf architecture=petiolate |leaf arrangement=alternate |leaf duration=deciduous |leaf position=basal |margin architecture or shape=entire |margin shape=undulate |ocreum duration=deciduous;persistent |ocreum pubescence or texture=chartaceous |outer tepal quantity=3 |outer tepal width=narrower |pedicel presence=absent |perianth coloration=pinkish green;whitish green |perianth pubescence=glabrous |perianth shape=campanulate |perianth size=nonaccrescent |root texture=fleshy |stamen atypical quantity=6;9 |stamen quantity=9 |stem orientation=erect |stem pubescence=pubescent;glabrous |stigma architecture or shape=capitate |style fusion=distinct |style orientation=deflexed;erect |style quantity=3 |tepal architecture=sepaloid |tepal fusion=distinct |tepal growth form=dimorphic |tepal quantity=6 |whole_organism duration=perennial |whole_organism growth form=herb |x chromosome quantity=11 }}<!-- -->[[Category:Treatment]][[Category:Polygonaceae subfam. 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