AULONEMIA NITIDA (POACEAE: BAMBUSOIDEAE: BAMBUSEAE), A NEW SPECIES FROM GUYANA

2005·2 MB·English

by  Emmet J Judziewicz

AUWNEMIANITIDA(POACEAE:BAMBUSOIDEAE:
BAMBUSEAE),ANEWSPECIESFROMGUYANA
EmmetJ.Judziewicz
DepartmentofBiology
UniversityofWisconsin-StevensPoint
StevensPoint,Wisconsin54481,U.S.A.
[email protected]
ABSTRACT
Anewspecies,AulonemianitidaJudz.,isdescribedfromthePakaraimaMountainsotGuyana,South
America.Itisalarge-leavedspeciesthatdiflersfromtheMesoamericanspeciesA.laxaandA.pa-
triaemItssmooth,shining,non-stnate,non-maculatefohageleafsheaths.Anillustrationolthe
newspeciesandakeytothespeciesofAidoneniiafromtheGuayanaHighlandsareprovided.
RESUMEN
Sedescribeunaespecienueva,AulonemianitidaJudz.,delasmontanasdePakaraima,Guyana,
AmericadelSur.Esunaespecieconlaminasfoliaresgrandesyanchasparecidaalasespecies
MesoamericanasA.laxayA.patriae,perosedistingueporsusvainasfoliareslisasylustrosas,sm
estriacionesomanchitas.Semcluyenunailustraciondelanuevaespecieyunaclavedelasespecies
deAulonemiadelasmontanasdeGuayana.
Sincethepublicationofthegrasstreatmentforthe"FloraoftheGuianas"project
(Judziewicz 199f),several morespecimensofanewbamboo(Poaceae:
Bambusoideae:Bambuseae:Arthrostylidiinae)speciesfromtheGuayanaHigh-
landshavecometolight.ThenameAulonemianitidahaslongbeeninprint,
appearingasanomennuduminBogganetal,(1997:168)checklistofGuianas
plants,and,basedontheBoyanspecimen,wasrecognizedasalikelynewspecies
aslongagoas1988.Eventhoughallfiveknowncollectionsaresterile,thetaxon
ItShseoedxiasmtipnlcetiovfeCtlhaartkI(h1a9v8e9,c1h9o9s2e)nwthooprhoapsosneaimtehderseeavseraalnediwstsipnecctiievse,sfpoelclioewsinmg
thebamboogenusChusqueaKunthbasedonmateriallackinginflorescences.
Specimenswereexaminedfromthefollowingherbaria:F(2002),FDG(1988),K
(1989),MO(2004),NY(1989),US(2004),UWSP(2004),andWIS(2004).
AulonemianitidaJudz.,sp.nov(Fig.l).TypeGUYANA.Potaro-SiparuniRegion:upper
slopesofMt.Vv'okomung,3°05'N-59°-50"W,1530m,Hedyosmum-hamboodominatedmoist
forest,bamboowithculmsatbaseto2cmdiam.,overallheight4m,commonandattimes
denseonupperslopes,sterile,14Jul1989,B.M.Boom&G.J.Samuels9224(holotypp::FDGl;
1SOTYPH.S:MO-3sheets!,NY!).
Graminumcespitosum.Culmiusquead5mlongi,2.5cmlati.Vaginaefoliorumglabrae,nitidae,
fimbriataeadapicemtantum;fimbriae7-fOcmlongae;laminaefoUorum25-37cmlongae,7-10.5
cmlatae,lanceolatae-ovatae.Inllorescentianonvidi.
SIDA21(3):1263-1267.2005
1264 BRIT.ORG/SIDA21(3)
Fig.1.A.Baseofplantshowingsympodialrhizomes(nodesandinternodesdecayedorindistinctinavailablematerial).
B.Culmandbranch.C.Branchwithfoliageleaves.D,Detailofligulararea.Scalebar=1cm.IllustrationbyEmilyLain.A
andBbasedonBoom&Samuels9224(MO),CandDbasedonHenkel,Williams,Fratello&Williams4493(WIS).
JUDZIEWICZ,ANEWSPECIESOFAULONEMIAFROMGUYANA 1265
Cespitoseperennial,thicket-formingwoodybamboofromshort,sympodial
rhizomes;glabrousthroughout.Culmsupto5mlongandatleast2.5cmin
diameter,shiny,hollow,thewallsonlyca.1mmthickwitha1-1.5mmthick
annularringpresentatthelowernodes;budsandbranchesonepernode.Culm
leavesnotseen,perhapsnotdifferentiatedfromfoliageleaves.Foliageleavesat
least5percomplement;sheathsglabrous,smooth,shiny,andstramineous
throughoutmostoftheirlength,stronglykeeled3-5cmbelowtheapex,striate
onlyinthearea0.5-1cmbelowtheapex;limbriaeca.12-20,each7-10mm
lroinmg,atpatlhee,fsluemxmuioutsoafntdhesplreeaafdisnhgea,tcho;nofultueerntlibgauslaelslcya.an0.d2fmormmilnognga,niinndduurraattee,
rim-like;innerligules1-1.5mmlong,membranous;pseudopetioles7-10mm
long,pale;blades25-37 x 7-10.5cm,narrowlyovatetobroadlylanceolate,
roundedtoveryslightlyobliqueorsubcordateatthebase,acuminateatthe
apex,notevidentlytessellate,theabaxialsurfaceslightlywhitenedorbluish
green.Inflorescencenotseen.
z'\dditionalcollectionsexamined(p.aratypfs):GUYANA.c;uyuni-iviazaruniRegion:Ayanganna[asand-
stonemountainwithasummitelevationolover2100m|slope,amongrocksinlowforest,sterile.2
Mar1%0,R.Boyan1201=FD7944](FDG,NY);PakaraimaMts„2kmtransectalongsummitridgeof
Mt.Ayanganna,5°23'N-59°59'W,1800-2000m,lowsclcrophyllouscommunity,organicsoilsonsand-
stone,3Nov1992,B.Hoffman&T.Henkel3209(US,Vv'ISj.Potaro-SiparuniRegion:Mt.VV'okomung,E-
moslpinnacleofmassif,5°05'34"N-59°50'13"W,1524m,coarseherli4m,sterile.13Jul2003,H.D.
aarkc.R.Willicinn,C.Perry,H.Tripp,D.GUtens&5.StanlOSOSiVS,Vv'IS);Mt.Wokomung,summit
ridgeofKa~mie-wahpinnacleNEtoSpinnacle,"LittleAyanganna,"5°04'N-59°52'W,1550-1650m,
mixedhardwoodcloudforestgradingtoGuyanascrubforestonpinnacleescarpments;onsandstone,
stoutbambusoidgrassfrom1-5mtall,formingthicketsonrockyridges,sterile,17Nov1993,'L\V.
Henkd.R.WiUuimi.S.Fratello.L.Williarm4493(FDG,MO.US,WIS).
DISCUSSION
Auloucmianitidaisendemictoelevationsof1500-2100mmcloudforestson
sandstone tepuisinthePakaraima Mountains(Mt. Ayangannaand Mt.
Wokomung;allcollectionscomefromanareaofabout30kminlength)of
GuyananeartheBrazilianfrontierThespeciesepithetderivesfromthenitid
orshinyfoliageleafsheaths.Avernacularnameis"rerobalh"(Boyan120).
Thereare35describedspeciesofAulonemiathroughouttropicalAmerica
(Clarketal.1997;Judziewiczetal.1999,2000)and1amcurrentlyworkingona
revisionofthegenus.Aulonemianitidaappearstobemostcloselyrelatedto
theMesoamericanspeciesA.laxa(EMaek.)McClureandA.patriaeR.Pohl(Pohl
&Davidse1994).Allthreetaxahavebroad,fimbriatefoliageleaveswithdis-
tinctivekeeledsheaths,butA.laxaandA.patriaehavesheathsthatarestriate
andmaculatetheirentirelengths.Aidoncniitinitidadiffersinitssmooth,shiny,
non-maculatesheathsthatarestriate,ifatall,onlyinthefinal1cmorsobelow
theligulararea.ThetwoMesoamericanspeciesalsodilierintheirgenerally
1266 BRIT.ORG/SIDA21(3)
longer(10-32mm)fimbriae;thoseofA.hixaarestraightandappressecltothe
cuhn,notspreadingasinA.nitidaandA.patviae.
Thereareeightspeciesol the Auloncmici intheGuayanaHighlands
(.Judziewicz2004).Inthe"Florao(theVenezuelanGuayana"(Judziewiczetal.
1991;Judziewicz2004)AuhviciuiauUidawouldkeytoeitherA.deficxa(N.E.
Brown)McClure,A.chimantacnsisjudz.&rDavidse,orA,/dutien.si.sjudz.&
Davidse.HoweverthesethreetaxahavesmallerloHagelealblades(amaximum
of22X4.5cmversusatleast25x7cminA.nilida),longerfunbriae(I0~20
mm longversus7-10mm in A.nitida),andcompletelystriate foliage leaf
sheaths. Aulononuidcflcxa,theonlyotherspeciesknowntromGuyana,is
presentathigherelevationsonMt.Roraima(ca.2800m),aswellasonseveral
Venezuelantepuis.Auloncmiapatula(Pilg.)McClurefromAndeanColombia
andEcuadorhassimilarlylargefoliageleaves,butthesheathsarenon-keeled,
non-striate,andtheIimbriaeareconspicuousallalongthesheathsmarginsas
wellasatthesheathsummit.AkeydilterentiatingthespeciesofAulonemia
loundintheGuayana1lighlandsfollows.
KHYTOThinSPnClFSOFAVLONEMIAFROMTHEGUAYANAHIGFIFANnS
1. Foliageleafsheathswithmarginalfimbriae.
2. Foliageleafbladeswithmidribexcentric,placed5-7mmfromonemarginofa
blade22-25mmwide;600-700mXerroHuachamacari,Amazonas,Venezuela
,^__^^A.sp.A(Judziewicz2004)
2. Foliageleafbladeswithmidribplacedcentrallyonablade30-60mmwide;
2200m,BolivarandAmazonas,Venezuela A.aff.subpectinata(Kuntze)McClure
1.Foliageleafsheathslackingmarginalfimbriae.
3. Foliageleafsheathsummitsprominentlyauriculate;1000-2000m.CcrroDuida,
Amazonas,Venezuela A.sp.B(Judziewicz2004)
3. Foliageleafsheathsummitslackingauricles.
4. Dwarfplantsca.0.5mtall;foliageleafbladesca.4cmlong,0.7cmwide;2600
4. Pml,aCnetrsr1o-M3aorrahmuoarkea.mAtmtaalzl;ofnoalsi,agVeenleeazfuebllaades11—37cmlong,A1..s8p-.10C.5(Jcumd/iewicz2004)
wide,
5. cFomliwaigdee;lefafimsbhreiaatehs7-s1m0oomtlmilaonndg;sh1i5n0y,0-t2h1e0b0lamd,eGsu2y5a-n3a7cmlong,7-10.A5.nitidaJudz.
5. wFiodliea;gfeimlbearfiasehe1a0th-s20stmrimatelaonngd.dull,theblades11-20cmlong,1.8-4.5cm
6. Spikelets 12-20 mm long,4-5-flowered;2100-2800m,Bolivar,
VenezuelaandadjacentGuyana A.deflexa(N.E.Brown)McClure
6. Spikelets22-70mmlong,9 23-flowered.
7. Spikelets22-40mmlong,9 ISTIowered;lemmas8-10mmlong,ob-
tuse,slightlytridentateatapex,glabroustosparselypuberulenton
theback,themarginsshort-cillate;2100-2200m,MacizodeChimanta,
Bolivar,Venezuela A.chimantaensisJudz,&Davidse
Z Spikelets(20-)40-70mmlong,1l-23Tlowered;lemmas10-13mm
long,acute,denselypuberulentthroughoutwithprickle-likehairs;
1900-2100m,CerroJaua,Bolivar,Venezuela A.jauaensisJudz.&Davidse
JUDZIEWICZ,ANEWSPECIESOFAULONEMIAFROMGUYANA 1267
ACKNOWLHDGMENTS
1thankLynnG.Clarkforencouragingmetopublishthispaper;thecuratorsof
MO,US,andWISforloans;EmilyLainfortheillustration;andPaulM.Peterson
forathoroughandhelpfulreview.
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