Telopea 11(2) 233-244

2006 Royal Botanic Gardens and Domain Trust ISSN0312-9764

New combinations in the genus Vachellia (Fabaceae: Mimosoideae) from Australia

Phillip G. Kodela and Peter G. Wilson

National Herbarium of New South Wales, Botanic Gardens Trust, Mrs Macquaries Road, Sydney NSW 2000, Australia

Abstract

BasedontheevidencethatthegenusAcaciasens. lat. ispolyphyleticandtheacceptancethatthemajor groups warrant generic status, and because the nameAcacia has been conservedwithanewtype,thefollowingnewcombinationsinVachelliaWight&Arn.arenecessaryforAustraliantaxaformerlyincludedinAcaciasubg.Acacia:Vachellia bidwillii (Benth.)Kodela,V. clarksoniana (Pedley)Kodela,V. ditricha (Pedley)Kodela,V. douglasica (Pedley)Kodela,V. pachyphloia(W.Fitzg.)KodelaandV. pachyphloiasubsp.brevipinnula(Tindale&Kodela)Kodela,V. pallidifolia(Tindale)Kodela,V. suberosa(A.Cunn.exBenth.)Kodela,V. sutherlandii (F.Muell.)Kodela,andV. valida(Tindale&Kodela)Kodela.Vachellia farnesiana(L.)Wight&Arn.,apre-EuropeanintroductiontoAustralia,haspreviouslybeentransferredtothegenus.Acacia nilotica(L.)Delilehasbeenleftfortheattentionofotherresearchersmorefamiliarwiththistaxon,itssynonymyanditsvarioussubspecies.

Introduction

SynopsesofrecentmorphologicalandmolecularstudiesshowingthatthegenusAcaciasens.lat.ispolyphyleticandrequiresdivisionintoatleastfivegeneraareprovidedbyMaslinetal.(2003,2003a).AttheJuly2005InternationalBotanicalCongressinViennaaconservationproposalbyOrchardandMaslin(2003)wasendorsed,resultingintheretypificationofthegenusAcacia (McNeilletal.2005).ThisdecisionresultsinthetypeofthegenusbeingchangedfromtheAfricanspeciesAcacia nilotica(L.)DeliletotheAustralianspeciesAcacia penninervisSieberexDC.Asaresultofthis,ifthegenusissplit,VachelliaWight&Arn.istheearliestavailablenameapplicabletospeciesformerlyincludedinAcaciasubg.Acacia,whilethenameAcacia isretainedforspeciesoftheformerAcaciasubg.Phyllodineae,themajorityofwhichoccurinAustralia.

InAustraliathereareelevenspeciesoftheformerAcacia subg.Acacia(Pedley2002);nineoftheseareendemictotropicalAustralia.Acacia farnesiana(L.)Willd.,whichiswidespreadthroughthetropicsincentralAmerica,AfricaandAsia,probablyarrivedinAustraliapriortoEuropeansettlement(Kodela&Tindale2001,Pedley2002).Themorerecentintroduction,Acacia niloticasubsp.indica(Benth.)Brenan(Fig.1),which

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isnaturalisedinQueenslandandtheNorthernTerritory,isnowknowntoshowgeneticdiversityinAustraliaindicatingthatmorethanoneinfraspecifictaxonmaybepresenthere(Wardilletal.2006).

Acacia farnesiana is the type of the genus Vachellia, so the combinationVachellia farnesiana(L.)Wight&Arn.(Prodr. Fl. Ind. Orient.272,1834)alreadyexists.PlantsofthistaxoninAustraliaseemalltobereferabletovar.farnesiana(Pedley2002,Kodelapers.obs., Seiglerpers. comm.) (Fig.2).Combinations inVachellia forNewWorldtaxaoftheformerAcaciasubg.AcaciahaverecentlybeenmadebySeiglerandEbinger(2006).

NewcombinationsinVachelliaaremadeherefortheendemicAustraliantaxasothatthesenamesareavailableforuseinflorasandchecklists.Nocombination,however,ismadeforAcacia nilotica(L.)Delile,whichpresentsmoredifficulties(seeWardilletal.2006)andhasbeenleftfortheattentionofotherresearchersmorefamiliarwiththistaxon,itssynonymyanditsvarioussubspecies.

New Combinations

1. Vachellia bidwillii (Benth.)Kodela,comb. nov. (Fig.3)

Basionym: Acacia bidwilliiBenth.,Linnaea26:629(1855).

Holotype:Queensland:AdWide-Bay,Australiaeboreali-orientalis(Bidwill)(K).

A. leptocladavar.(?)polyphyllaBenth.,Fl. Austral.2:416(1864).Holotype: East Coast [Queensland], R. Brown [Bennett sheet No. 4331], 18025(K;photoNSW).

A. bidwilliivar.bidwillii,Fl. Austral.2:420(1864),autonym.

A. bidwilliivar.polytrichaDomin,Biblioth. Bot.89:273(1926).Type citation: Nord-Queensland: Savannenwlder bei Mungana (Domin II. 1910)Holotype:Queensland:inxerodrymioapudopp.Mungana,K. Domin 5148,Feb1910(PR527948).

2. Vachellia clarksoniana (Pedley)Kodela,comb. nov.

Basionym: Acacia clarksonianaPedley,Austrobaileya6:184,fig.1A,B(2002).

Holotype:Queensland:3.9kmfromNewDixiehomestead,J.R. Clarkson 3585,15Oct1980(BRI).Isotypes:ILL,K,MEL,MO,NSW,PERTH,PR,QRS.

3. Vachellia ditricha (Pedley)Kodela,comb. nov. (Fig.4)

Basionym: Acacia ditrichaPedley,Austrobaileya1:307(1980).

Holotype: Queensland: Kowanyama Aboriginal Reserve on the Mitchell River,B. Alpher,Dec1977(BRI).

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Fig. 1. Acacia niloticasubsp.?indica.a,branchletwithleavesandinflorescences;b,leafbaseandstipularspines;c,pinnule;d,petiolargland;e,glandatapexofleafrachis;f,bark;g,inflorescenceinbud;h,flowerbud;i,flower;j,gynoecium;k,bracteoles;l,pod;m,seeds.ae,ik,Newman 565(NSW);f,Coveny 6925 & Hind (NSW);g,h,l,m,C.E.F. Allen(NSW271068).Scalebar=0.6cm(d,e,hk),1cm(c),1.2cm(b,g),3cm(m),6cm(a,f,l).

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4. Vachellia douglasica (Pedley)Kodela,comb. nov.

Basionym: Acacia douglasicaPedley,Austrobaileya6:181,fig.1C,D(2002).

Holotype:NorthernTerritory:0.5kmWofDouglasRiver,M. Parker 508,23Oct1974(BRI).Isotypes:CANB,DNA,NSW.

AcaciaDouglasR.,C.R.Dunlopet al.,Fl. Darwin Region2:20,fig.4(1995).

Note:Pedley(2002)suggestedthatTindaleandKodela(1996)includedA. douglasicaaspartofA. ditrichabutthiswasnotthecase.AlthoughspecimensofthethenundescribedspeciesA. douglasicawereknownatthetimeandwereconsideredasapossiblevariantofA. ditrichatheywereneitherincludedinthedescriptionofA. ditrichanorcitedintheTindaleandKodela(1996)paper.TheDouglasRivertaxonwaslateraddressedintheFlora of Australia(Kodela&Tindale2001:202)underAcacia bidwillii.

5. Vachellia pachyphloia (W.Fitzg.)Kodela,comb. nov.

Basionym: Acacia pachyphloiaW.Fitzg.inJ.H.Maiden,J. & Proc. Roy. Soc. New South Wales51:116(1917).

Typecitation:SlopesofBoldBluff;hillsnearC.92,inproximitytotheSynnottRange;hillsbytheCharnleyandCalderRivers(W.V.F.)

Lectotype(fideTindale&Kodela1996:311):WesternAustralia:nearSynnott[Synnot]Range, W.V. Fitzgerald 1267,July1905(NSW).Isolectotype:PERTH.

Residual syntypes[paralectotypes]: slopesofBoldBluff,W.V. Fitzgerald;hillsby theCharnleyandCalderRivers,W.V.Fitzgerald(n.v.,locationunknown).

5a. Vachellia pachyphloia (W.Fitzg.)Kodela subsp. pachyphloia

5b. Vachellia pachyphloia subsp. brevipinnula (Tindale & Kodela) Kodela, comb. nov.

Basionym: Acacia pachyphloiasubsp.brevipinnulaTindale&Kodela,Austral. Syst. Bot.9:314,fig.3(1996).

Holotype:WesternAustralia:26kmNofturnofftoMitchellFallsalongroadtoPortWarrender,M. McDonald 336,14June1987(NSW).Isotype:PERTH.

6. Vachellia pallidifolia (Tindale)Kodela,comb. nov. (Fig.5)

Basionym: Acacia pallidifolia Tindale,Telopea 1: 82 (1975), based onAcacia pallidaF. Muell., J. Linn. Soc., Bot. 3: 147 (1859), partim, non Humb. et Bonpl. exWilld.(1806).

Lectotype(fideTindale,loc. cit.):NorthernTerritory:FitzmauriceRiver,arbusculaincampisapricis,F. Mueller 76, 75,Oct1855(MEL).Isolectotype:NSW.

Residual syntypes [paralectotypes]: McAdam Range, F. Mueller 75, Oct 1855 (K,PERTH).

Acacia turbataPedley,Austrobaileya6:180(2002).Holotype:NorthernTerritory:EofMaryRiver,S.T. Blake 17095,29Sep1946(BRI).Isotype:NSW.

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Fig. 2. Vachellia farnesianavar.farnesiana.a,branchletwithleaves,inflorescencesandimmaturepods;b, leaves,inflorescencesandstipularspines;c,stipularspines;d,petioleshowinggland;e, petiolar gland; f, inflorescence in bud; g, involucel of united bracts at apex of peduncle(usuallyhiddenbyflowers);h,flowerbud;i,flower;j,gynoecium;k,anther;l,bracteoles;m,n,pods;o,seeds.a,f,hj,l,Coveny 6572 & Powell(NSW);b,d,Milvain (NSW108509);c,m,K. Moore(NSW108510);e,G.M. Cunningham 704(NSW);g,Milthorpe 3821(NSW);k,Rodd s.n.(NSW70825),n,o,Coveny 6522 & Powell(NSW).Scalebar=0.075cm(k),0.4cm(e),0.6cm(hj,l),1.2cm(d,f,g),2cm(c),3cm(o),6cm(a,b,m,n).

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Fig. 3. Vachellia bidwillii.a,branchletwithleaves;b,petioleandstipularspines;c,petiolargland;d, apex of leaf rachis; e, inflorescences; f, inflorescence in bud; g, flower bud;h, bracteoles;i,flower; j,gynoecium;k,anther; l,pod;m, seed.al,Tindale (NSW52690);m,Coveny 6876 &Hind (NSW). Scale bar = 0.1 cm (k), 0.4 cm (c), 0.6 cm (gj), 1 cm (b, d), 1.2 cm (f),4cm(m),6cm(a,e,1).

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Fig. 4. Vachellia ditricha.a,apexofbranchletwithleafandpod;b,baseofleafshowingpetiolargland;c,apexofleaf;d,apexofpinna;e,bark;f,pod;g,sectionofpodshowingindumentumonoutersurface;h,seedinpod;i,j,seeds;k,seedling.a,Maconochie 206(DNA);bd,j, Perry 2833& Lazarides (CANB);ei,Jacobs 1732(NSW);k,AZRI(NTsheet),seedlinggrownfromseedofN. McK. Henry 7(NT31554).Scalebar=0.5cm(g),0.6cm(d),1.2cm(b,c),3cm(i),4cm(a,j),6cm(e,f,h,k).

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Note:ThepossibletypematerialofAcacia pallidaF.Muell.,nom.illeg.,includestwodifferenttaxa.However,therehavebeentwodifferentinterpretationsofthismaterialthat have resulted in the replacement nameA. pallidifolia Tindale being applied toeach of these twodifferent taxa.Wehave followed the concept adopted byTindale(1975)whilePedley(2002)appliesthisnametothetaxonnamedA. validabyTindaleandKodela(1996).Tofurtheraddtotheconfusion,Pedley(2002)reversesTindalesapplicationofthenameAcacia pallidifolia,renamingherspeciesconceptasA. turbataPedley.ThespeciesconceptoriginallyadoptedbyTindale(1975),andwhichwas inuseforalmost30years,hasnowbeenchallengedbyPedleys(2002)rejectionofherlectotypification.WhilePedleysviewhasmerit,wesuggestthatnomenclaturalstabilityis notwell served byhis approach because itwould lead to a confusing reversal ofnames. A case for conservation of the nameA. pallidifolia in the sense of Tindale(1975)isinpreparationandwillbesubmittedforconsiderationbytheCommitteeforSpermatophyta.

7. Vachellia suberosa (A.Cunn.exBenth.)Kodela,comb. nov. (Fig.6)

Basionym: Acacia suberosaA.Cunn.exBenth.,London J. Bot.1:499(1842).

Lectotype (fide Kodela, Fl. Australia 11A: 642, 2001):WesternAustralia: CareeningBay,NorthWestCoast,3rdVoyageofMermaid,A. Cunningham 300,Sep1820[larger,right-handelement](K).Isolectotype:BM.

Residualsyntypes[paralectotypes]:WesternAustralia:EncounterCove,VansittartBay,NorthWestCoast,2ndVoyageofMermaid,A. Cunningham 488,Oct1819(BM,K).

8. Vachellia sutherlandii (F.Muell.)Kodela,comb. nov. (Fig.7)

Basionym: Albizia sutherlandi F.Muell., Fragm. 6: 22 (1867). Acacia sutherlandii(F.Muell.) F.Muell. (as Sutherlandi), Iconogr. Austral. Acacia Dec. 12: [pl. 8] (June1888).

Holotype:Queensland:FlindersRiver,J. Sutherland 114(MEL).

Acacia melaleucoidesF.M.Bailey,Proc. Roy. Soc. Queensland5:121(Sep1888).Holotype:Queensland:South-easternslopeofNewcastleRange,betweenGeorgetownandJunctionCk,R.C. Burton(?BRI,n.v.)

9. Vachellia valida (Tindale&Kodela)Kodela,comb. nov.

Basionym: Acacia validaTindale&Kodela,Austral. Syst. Bot.9:307,fig.1(1996).

Holotype:NorthernTerritory:MathisonCk,c.91.5kmWofKatherineontheVictoriaHwy,M.D. Tindale 10101, P. Munns & R. Turley,2Aug1989(NSW).Isotypes:AD,BRI,CANB,DNA,K,MEL,MO,PERTH.

A. pallidaF.Muell., J. Linn. Soc., Bot.3:147(1859),partim,nonHumb.etBonpl.exWilld.(1806).

A. bidwilliiBenth.var.(?)majorBenth.(asBidwilli),Fl. Austral.2:421(1864).Holotype: (Dry) ridges of the Victoria River, F. Mueller 76, Nov 1855 (MEL).Isotype:K.

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Fig. 5. Vachellia pallidifolia.a,branchletwithleavesandinflorescences;b,pinnulesatapexofpinna;c,leafscarshowingsmallstipularspines;d,leafglands;e,inflorescenceinbud;f,flowerbud;g,flower;h,gynoecium; i,bracteoles; j,pod;k, seed.a,b,di,M. WhiteMR13(CANB);c, j, k,Blake 17095 (NSW). Scale bar = 0.4 cm (f), 0.6 cm (gi), 0.66 cm (d), 1.33 cm (e),2cm(b,c),4cm(k),6cm(a,j)

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Fig. 6. Vachellia suberosa.a,branchletwithleavesandinflorescences;b,leafandstipularspines;c,glandatapexofleafrachis;d,bark;e,inflorescenceinbud;f,innersurfaceofbracteole;g,outersurfaceofbracteole;h,flower;i,gynoecium;j,anther;k,pod;l,sectionofpodshowingindumentumonoutersurface;m,seed.a,c,e,j,Lazarides 7744(NSW);b,Lazarides 3104(NSW);d,Maconochie 1183(NSW);fiByrnes 2228 (NSW);km,Lazarides 6515(NSW).Scalebar=0.1cm(j),0.3cm(l),0.4cm(c),0.6cm(fi),1.5cm(e),2cm(b),4cm(m),6cm(a,d,k).

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Fig. 7. Vachellia sutherlandii. a, part of branchletwith leaf and inflorescence;b, part of leafrachisshowingpetiolargland;c,apexofpinna;d,bark;e,flowerbud;f,flower;g,gynoecium;h,bracteoles;i,anther;j,pod;k,seed.ac,ei,Waterhouses.n.(NSW108060);d,Jacobs 1374(NSW);j,k,Hind 1069 & Ingram(NSW).Scalebar=0.1cm(i),0.6cm(c,eh),1cm(b),4cm(k),6cm(a,d,j).

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Note: Pedley (2002) treated A. valida as a synonym of Acacia pallidifolia. Correctapplication of the latter name is contingent upon resolution of the issue of itstypification,asdiscussedabove.

Acknowledgments

WearegratefulforcommentsandadviceontheAcacia pallidatypificationissueprovidedin2000byDrsMaryTindaleandJimRoss(MEL),aswellasearlieradviceprovidedtoDrTindalebythelateDrL.A.S.Johnson.ManythanksalsotoBruceMaslinandPaulWilsonforconstructivecommentsonthismanuscript.DaveSeiglerkindlyprovideddetails of his recently publishedpaper and other information.Access to collectionswasgenerouslyprovidedbyBM,KandMEL.IllustrationswerebyRobinGriffithsandmadeavailablebyDrTindale.CatherineWardropandJuliaSiderisassistedwiththefinalpreparationoftheillustrationsandscalebars.

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Manuscript received 20 February 2006, accepted 1 March 2006

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