View source for Achyrachaena

{{Treatment/ID
|accepted_name=Achyrachaena
|accepted_authority=Schauer
|publications={{Treatment/Publication
|title=Index Seminum (Bratislave)
|place=1837: [3]. 1837
|year=1837
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Madiinae;Achyrachaena
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Heliantheae]]</div><div class="higher-taxon"><small>subtribe</small>[[Asteraceae (tribe Heliantheae) subtribe Madiinae]]</div><div class="higher-taxon"><small>genus</small>[[Achyrachaena]]</div></div>
|etymology=Greek achyron, scale, and Latin achaenium, fruit, alluding to cypselae
|volume=Volume 21
|mention_page=page 255
|treatment_page=page 258
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole-organism some measurement;whole-organism duration"><b>Annuals,</b> 4–62 cm.</span> <span class="statement" id="st-d0_s1" data-properties="stem orientation;stem architecture"><b>Stems </b>erect, branched distally.</span> <span class="statement" id="st-d0_s2" data-properties="leaf position"><b>Leaves </b>mostly cauline;</span> <span class="statement" id="st-d0_s3" data-properties="proximal leaf arrangement">proximal opposite, distal alternate;</span> <span class="statement" id="st-d0_s4" data-properties="distal leaf arrangement;distal leaf architecture">± sessile;</span> <span class="statement" id="st-d0_s5" data-properties="blade arrangement or course or shape;margin shape;margin shape;face pubescence;face pubescence;face pubescence">blades linear, margins entire or toothed, faces hirsute or villous and (distal leaves) sparsely glandular-pubescent.</span> <span class="statement" id="st-d0_s6" data-properties="head architecture or arrangement;head arrangement;head arrangement"><b>Heads </b>radiate, borne singly or in loose, ± corymbiform arrays.</span> <span class="statement" id="st-d0_s7" data-properties="spine presence"><b>Peduncular </b>bracts: pit-glands, tack-glands, and/or spines 0 at tips.</span> <span class="statement" id="st-d0_s8" data-properties="involucre shape;involucre diameter"><b>Involucres </b>± campanulate to cylindric or ellipsoid, 3–12+ mm diam.</span> <span class="statement" id="st-d0_s9" data-properties="phyllary quantity;series quantity"><b>Phyllaries </b>3–8 in 1 series (± lance-linear, herbaceous, each fully enveloping a ray ovary, abaxially hirsute or villous and sparsely glandular-pubescent or eglandular).</span> <span class="statement" id="st-d0_s10" data-properties="receptacle shape;receptacle architecture"><b>Receptacles </b>flat to convex (setulose), paleate (paleae falling, in 1 series between rays and disc, distinct).</span> <span class="statement" id="st-d0_s11" data-properties="ray-floret quantity;ray-floret architecture;ray-floret reproduction"><b>Ray-</b>florets 3–8, pistillate, fertile;</span> <span class="statement" id="st-d0_s12" data-properties="corolla coloration;corolla coloration">corollas yellow, turning reddish (lobes ± parallel).</span> <span class="statement" id="st-d0_s13" data-properties="disc-floret quantity;disc-floret reproduction;disc-floret reproduction"><b>Disc-</b>florets 4–35, bisexual and fertile;</span> <span class="statement" id="st-d0_s14" data-properties="corolla coloration;tube variability;lobe quantity;lobe shape">corollas yellow to reddish, tubes ± equaling narrowly funnelform throats, lobes 5, lance-deltate (anthers ± dark purple; styles glabrous proximal to branches).</span> <span class="statement" id="st-d0_s15" data-properties="ray cypsela shape;ray cypsela shape"><b>Ray </b>cypselae (black) obcompressed, clavate (10-ribbed, straight, basal attachments centered, apices beakless, faces glabrous or ± scabrous);</span> <span class="statement" id="st-d0_s16" data-properties="pappus presence">pappi 0.</span> <span class="statement" id="st-d0_s17" data-properties=""><b>Disc </b>cypselae (brown to black) similar to rays (± scabrous);</span> <span class="statement" id="st-d0_s18" data-properties="scale quantity;scale coloration;scale shape">pappi of 10 white, oblong scales (apices obtuse).</span> <span class="statement" id="st-d0_s19" data-properties="x chromosome quantity">x = 8.</span><!--

-->{{Treatment/Body
|distribution=w North America;nw Mexico
|discussion=<p>Species 1.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Achyrachaena
|author=Bruce G. Baldwin;John L. Strother
|authority=Schauer
|rank=genus
|parent rank=subtribe
|synonyms=
|basionyms=
|family=Asteraceae
|illustrator=Barbara Alongi
|illustration copyright=Flora of North America Association
|distribution=w North America;nw Mexico
|reference=None
|publication title=Index Seminum (Bratislave)
|publication year=1837
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V21_635.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae
|genus=Achyrachaena
|blade arrangement or course or shape=linear
|corolla coloration=yellow;reddish
|disc-floret quantity=4;35
|disc-floret reproduction=fertile;bisexual
|distal leaf architecture=sessile
|distal leaf arrangement=alternate
|face pubescence=glandular-pubescent;villous;hirsute
|head architecture or arrangement=radiate
|head arrangement=in loose , more or less corymbiform arrays;singly
|involucre diameter=3mm;12mm
|involucre shape=less campanulate;cylindric or ellipsoid
|leaf position=cauline
|lobe quantity=5
|lobe shape=lance-deltate
|margin shape=toothed;entire
|pappus presence=absent
|phyllary quantity=3;8
|proximal leaf arrangement=opposite
|ray cypsela shape=clavate;obcompressed
|ray-floret architecture=pistillate
|ray-floret quantity=3;8
|ray-floret reproduction=fertile
|receptacle architecture=paleate
|receptacle shape=flat;convex
|scale coloration=white
|scale quantity=10
|scale shape=oblong
|series quantity=1
|spine presence=absent
|stem architecture=branched
|stem orientation=erect
|tube variability=equaling
|whole-organism duration=annual
|whole-organism some measurement=4cm;62cm
|x chromosome quantity=8
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae (tribe Heliantheae) subtribe Madiinae]]