Reinstatement and Revision of Euryomyrtus
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No. 3 (2001) and.Rinlia, as sectionsof that genus. He placedBaecka in rhe subtribe"Baeckeaeae" of the tribe Leptospermeaewith Scholtzia,Hypocalymma, Astartea DC. ar'dBalauJrion Hook. Niedenzu(1898) maintained Euryonlyrtus as a sectionof Baeckea(in which he alsoincluded Asturtea andScholtzid as sections) but hansferredthe relatedspecies Bentham had placedin section Rinzia to Hypocalymmc. He thus recognizedthat Rinzia andHypocalynma arerelated but failed to recognizethat the speciesBentham placed in his sectionEr.rry omytus arc morc closelyrelated to these generathan to theremai:nder of Baecka ascircumscribedby Bentham. Bean ( 1995,1997) recognized th^t Euryomyrtus should be consideredgenerically distinct but did not formally reinstate it ol lectotypifyit. In theirinformal classification of theMyrtaceae, Briggs & Johnson(1979) placed Baeckea inthe Baeckeasuballiance of their Chamelauciumalliance, with Euryomyrtusas a sectionrequiring investigationto see if it deservedgeneric rank. They subsequently(Johnson & Briggs 1985) abandonedsuballiances in the Chamelauciumalliance and presenteda sketch phyllogram of relationshipswithin this difficult group. Materials and methods This studywas basedon the grossmorphology of herbariummaterial supplemented by some observationsin thefield. Themeasurements given for theparts of flowerswere taken from material thathad been boiled in waterwith a smallamount of detergentin it. Themeasurements of leaves were takenfrom dry material.A selectionofthe materialexamined has been cited, based on location(to coverthe range of thespecies), quality of labelinformation and variation. For poorly collected species all the material seenhas beencited. Terminol.ogy.Processes (Trudgen 1986) are the same structures referred to by Can (1980)as floral trichomes.They also occurin atleastsomeRfuzia species and some other members ofthenatural group to which Euryomyrtrs belongs. Theinflorescence terms anthopodium, monad, uniflorescence, conflorescgnce, superconllorescence, brachyblast,auxotelic and anauxotelicare usedas definedby Briggs & Johnson(1979). Aril, hypanthiumand flower size are used as defined in Trudgen(1986). Testa surface terminology follows Murley(1951) as given in Steam(1973). Separation of Euryom!rtus from relxted genera Within thesupra-generic group having reniform seeds, the seven species referred here to Euryomyrtus form a coherentsubgroup that is sufficiently distinct to deservegeneric rank. Euryomyrtuscanbe distinguished from the other membersof the reniform-seededgroup by having the following combinationof characters: 1. Filamentsterete (sometimes slightly flattened near the base) and the stamens opposite the petals with longer filamentsthan thoseopposite the sepalsand betweenthe sepalsand petals. 2. Anthersdorsifixed and versatile. 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'(sueuels E u€tl ss:J aje eJa{ ueql./'DlDttsoJd 'dsqns owtsstsowot !' ut lsol aJ?qolqrli.Jo eruos) spled aql ellsoddoosot! uuqlJet1lu lsol eres1e1ad pue 'pecnpal spdas eq1uee,rteq rolpue spdes eqt elrsoddosueurels esoql ueql sI Jeqlunuuotll€1s ueqld € 'ue8pruI swr(wofu A Jo uolsl^erpue luau4stsureU A I,^l s46 Nu],tuidVol. 13, No. 3 (2t)01) seedis known (no seedofthe undescribedspecies has been seen) it doesnothave an aril andthe papillae on the testaare very small (barelydistinguishable at x10);the seedsof two of the species (8. crassifolia andB. ericaea)havea largehilum (c. 1/3ofthe lengthofthe seed);while variable(between the species) the bracteolesare dissimilar to thosefound rn Euryomyrtusand are opposite rather than sub-opposite/ alternateiin threeof the speciesthe calyx lobes areinfolded after flowering, whercasin Euryomyrtus they are not; finally in these four speciesthe inflorescenceis consistently of axillary monads and brachYblastsare not Dresent. Systematicposition of Euryomyrtus "sketch Briggs & Johnson(1984:747, figure l0) presenteda phylogrzun"of their interpretation of relationshipswithin their Chamelauciumalliance developedfrom the information then available "standard" to them. This phylogram has six evolutionary lines arising from a putative ancestor "hairs describedas lost, ovary 3-locular, linflorescenca]metabotyoid, hypocotyl>cots." (commas added). Oneof thosesix lineshas only Hypocalymma on rt, anotheronly Balaustionand a third is more complex with branchesfor five genera:Baeckea, Astartea, Baeckea, Thryptomene, Micromyrtus and Corynantherct.Ithas more thanone branchtoBaeckea,to show (as Briggs & Johnsonindicated in their text) that Baeckeawas consideredto include more than one genus. Subsequently,Trudgen (1986, 1987)described the existenceofa distinctive seedtype in Rirzra, Ochrospermaandrelated genera that has a reniform shape,a crustaceoustesta