View source for Myosoton

{{Treatment/ID
|accepted_name=Myosoton
|accepted_authority=Moench
|publications={{Treatment/Publication
|title=Methodus,
|place=225. 1794
|year=1794
}}
|common_names=Giant or water chickweed;stellaire aquatique
|basionyms=
|synonyms=
|hierarchy=Caryophyllaceae;Caryophyllaceae subfam. Alsinoideae;Myosoton
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Caryophyllaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Caryophyllaceae subfam. Alsinoideae]]</div><div class="higher-taxon"><small>genus</small>[[Myosoton]]</div></div>
|etymology=Greek myos, mouse, and otos, ear, alluding to leaves
|volume=Volume 5
|mention_page=page 4, 7, 96, 97
|treatment_page=page 95
}}<!--

--><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="taproot size;rhizome size"><b>Taproots </b>slender, rhizomes slender.</span> <span class="statement" id="st-d0_s2" data-properties="stem orientation;stem architecture;stem architecture;stem shape"><b>Stems </b>decumbent to ascending, simple or branched, terete to angular.</span> <span class="statement" id="st-d0_s3" data-properties="leaf architecture;leaf architecture or fixation;leaf architecture;leaf architecture"><b>Leaves </b>sessile leaves clasping proximally, petiolate (proximal leaves) or sessile (most cauline leaves);</span> <span class="statement" id="st-d0_s4" data-properties="blade architecture;blade shape;blade texture;apex shape">blade 1-veined, ovate to broadly elliptic, not succulent, apex acute.</span> <span class="statement" id="st-d0_s5" data-properties="inflorescence position;inflorescence position;cyme architecture"><b>Inflorescences </b>axillary or terminal, open cymes;</span> <span class="statement" id="st-d0_s6" data-properties="bract arrangement;bract architecture;bract size">bracts paired, foliaceous, smaller.</span> <span class="statement" id="st-d0_s7" data-properties="pedicel orientation;pedicel orientation"><b>Pedicels </b>ascending to erect, reflexed in fruit.</span> <span class="statement" id="st-d0_s8" data-properties="flower reproduction;flower architecture;flower size;flower reproduction"><b>Flowers </b>bisexual, occasionally pistillate or reduced and sterile;</span> <span class="statement" id="st-d0_s9" data-properties="perianth position;androecium position">perianth and androecium weakly perigynous;</span> <span class="statement" id="st-d0_s10" data-properties="">hypanthium minimal;</span> <span class="statement" id="st-d0_s11" data-properties="sepal quantity;sepal fusion;sepal coloration;sepal shape;sepal atypical some measurement;sepal some measurement;sepal growth form or texture;margin coloration;margin coloration;margin texture;margin texture;apex shape;apex architecture">sepals 5, distinct, green, ovate, 4–6 (–9) mm, herbaceous, margins green or white, herbaceous or scarious, apex acute, not hooded;</span> <span class="statement" id="st-d0_s12" data-properties="petal quantity;petal coloration;claw presence;blade apex shape">petals 5, white, claw absent, blade apex deeply 2-fid;</span> <span class="statement" id="st-d0_s13" data-properties="filament arrangement;sepal arrangement">nectaries at base of filaments opposite sepals;</span> <span class="statement" id="st-d0_s14" data-properties="stamen quantity;stamen quantity;stamen orientation">stamens 10, occasionally fewer, arising from nectariferous disc at ovary base;</span> <span class="statement" id="st-d0_s15" data-properties="filament fusion">filaments distinct;</span> <span class="statement" id="st-d0_s16" data-properties="staminode presence;staminode arrangement or course or shape">staminodes sometimes present, linear;</span> <span class="statement" id="st-d0_s17" data-properties="style atypical quantity;style quantity;style fusion;style shape;style some measurement;style pubescence">styles 5 (–6), distinct, filiform, 0.7–1.8 mm, glabrous proximally;</span> <span class="statement" id="st-d0_s18" data-properties="stigma atypical quantity;stigma quantity;stigma arrangement or course or shape;stigma relief;stigma quantity">stigmas 5 (–6), linear along adaxial surface of styles, papillate (30×).</span> <span class="statement" id="st-d0_s19" data-properties="capsule shape;valve atypical quantity;valve quantity;valve orientation;valve shape"><b>Capsules </b>ovoid to globose-ovoid, opening by 5 (–6), slightly recurved, briefly 2-fid valves;</span> <span class="statement" id="st-d0_s20" data-properties="carpophore presence">carpophore absent.</span> <span class="statement" id="st-d0_s21" data-properties="seed quantity;seed coloration;seed shape;seed shape;seed relief;marginal wing presence"><b>Seeds </b>50–100, brown-blackish, reniform, laterally compressed, papillate, marginal wing absent, appendage absent.</span> <span class="statement" id="st-d0_s22" data-properties="appendage presence;x chromosome quantity">x = 14.</span><!--

-->{{Treatment/Body
|distribution=Europe;temperate Asia
|introduced=true
|discussion=<p>Species 1.</p><!--
--><p>The combination of 5(–6) styles and a capsule opening by the same number of briefly 2-fid valves characterizes Myosoton and is not known in Stellaria. Most chromosome counts of M. aquaticum are 2n = 28, a very rare number in Stellaria.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Myosoton
|author=Richard K. Rabeler
|authority=Moench
|rank=genus
|parent rank=subfamily
|synonyms=
|basionyms=
|family=Caryophyllaceae
|illustrator=Barbara Alongi
|illustration copyright=Flora of North America Association
|distribution=Europe;temperate Asia
|introduced=true
|reference=None
|publication title=Methodus,
|publication year=1794
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V5/V5_200.xml
|subfamily=Caryophyllaceae subfam. Alsinoideae
|genus=Myosoton
|androecium position=perigynous
|apex architecture=not hooded
|apex shape=acute;acute
|appendage presence=absent
|blade apex shape=2-fid
|blade architecture=1-veined
|blade shape=ovate;broadly elliptic
|blade texture=not succulent
|bract architecture=foliaceous
|bract arrangement=paired
|bract size=smaller
|capsule shape=ovoid;globose-ovoid
|carpophore presence=absent
|claw presence=absent
|cyme architecture=open
|filament arrangement=opposite
|filament fusion=distinct
|flower architecture=pistillate
|flower reproduction=sterile;bisexual
|flower size=reduced
|inflorescence position=terminal;axillary
|leaf architecture=sessile;petiolate;sessile
|leaf architecture or fixation=clasping
|margin coloration=white;green
|margin texture=scarious;herbaceous
|marginal wing presence=absent
|pedicel orientation=reflexed;ascending;erect
|perianth position=perigynous
|petal coloration=white
|petal quantity=5
|rhizome size=slender
|seed coloration=brown-blackish
|seed quantity=50;100
|seed relief=papillate
|seed shape=compressed;reniform
|sepal arrangement=opposite
|sepal atypical some measurement=6mm;9mm
|sepal coloration=green
|sepal fusion=distinct
|sepal growth form or texture=herbaceous
|sepal quantity=5
|sepal shape=ovate
|sepal some measurement=4mm;6mm
|stamen orientation=arising
|stamen quantity=fewer;10
|staminode arrangement or course or shape=linear
|staminode presence=absent
|stem architecture=branched;simple
|stem orientation=decumbent;ascending
|stem shape=terete;angular
|stigma arrangement or course or shape=linear
|stigma atypical quantity=5;6
|stigma quantity=[30;5
|stigma relief=papillate
|style atypical quantity=5;6
|style fusion=distinct
|style pubescence=glabrous
|style quantity=5
|style shape=filiform
|style some measurement=0.7mm;1.8mm
|taproot size=slender
|valve atypical quantity=5;6
|valve orientation=recurved
|valve quantity=5
|valve shape=2-fid
|whole_organism duration=perennial
|whole_organism growth form=herb
|x chromosome quantity=14
}}<!--

-->[[Category:Treatment]][[Category:Caryophyllaceae subfam. Alsinoideae]]