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Stong evidencefavouring this opinion is providedby unpublishedmolecular data, in which the l0-staminate and2-oyulateMicromyrtus elobata (F.Muell.) Benth.formed a sistergroup with Corynantherarather than associatingwith the five other Micromyrtus speciesthat were sampled(Peter G. Wilson pers. comm.).The latter five species,M. cil,4/4 (Sm.) Druca,M. delicataA.R.Bean, M gracllls A.R. Bean, M. hexamera(Maid. & Betch) Maid. & Betch. and M. erichsenii,formed a clade. Two main categoriesbased on hypanthiumribbing car be distinguishedamotg the Micromyftus species,and thesecoincide with the two groupsdelimited by the moleculardata. Most Micromyftus species,including the five speciesforming a clade,have less than ten ribs, usually with one rib opposite eachsepal, on the hypanthium.This largespecies group extendsacross the Ausfalian mainlandand has variablenumbers of stamens(5-12) and ovules(1-10) per flower. In the other category,the one with closeraffinities to Co4tnanthera, thehypanthium is usually 10-ribbedwith one rib oppositeeach sepal and petal. This group, comprisedof M. elobata and its rclatives, is restrictedto the south-westof WesternAustalia and consistentlyhas ten stamensand two ovules. Most ofthe speciesincluded in the genusMicromynus when it wasoriginally describedby Bentham (1865, 1867)belong to the more widespreadand more speciosecategory lacking antipetalousdbs on the hypanthium. The purposeof the cuffentpaper is to nominateone of the membersofthis plant group as the lectotypeof Micromyfius andto completethe Australia-widecoverage of the group by revising the south-westernspecies, all of which have a 5-ribbed hypanthium. A d€scriptionapplicable to this group throughoutits range,and a key to the WesternAustralian species,are also given. Methods All measurementswere liom dry herbariumcollections, with leaf andbracteole measurements taken from the largestofthese structureson eachspecimen. Petal length and most other floral measurements weretakenfrom well pressedmature flowers. Peduncleand style measurements were taken frommature flowers andfrom fruits. Fruit measurementsinclude the adnateportions ofthe hypanthiumand disc but do not include the length of the l'reeportion of the hypanthlumand the pe$istent sepals, Distdbutions were plotted on maps showing the interim biogeographicregions of Thackway & Cresswell(1995) and the following abbreviationsare usedhere for theseregions. Botanicalprovinces are as defined by Beard (1980). AW Avon Wheatbelt COO Coolgardie ESP - EsperancePlains GS - GeraldtonSandplain JF - JarrahForest MAL - Mallee MUR - Murchison YAL - Yalgoo Formal taxonomy Micromyrtus Benth.ln G. Bentham& J.D. Hooker,Gen. Pl. 1, 700 (1865).- Thryptomenesect. Micromyrtus(Benth.) F. Muell.,Fragm. Phyt. Austfal.8, 13(1873). Type: Micromyrtus drummondii BelJth.nom. supetl. l= Micromyfiusobovqta (Turcz.) J.W. Greenl, lectotype here nominated. 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