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No. 3 (2001) Three independentlines of investigation suggestthat, taken together,Leiocarpa is generically distinctfrom all cunently recognizedgenera. Theseare thechromosome numbers (whereknown), the mycorrhizal associations(where known), and the morphology of the involucral bracts,carpels and other organs. Chromosome number Thc chromosomen unber of lxiolaena s.,lrr.has not beenrecorded. The fcw chromosomecounts that have been made in the othcr three generaunder considerationsuggest that the base number in Leiocarpa is dilferent ftom that of C&ry.tocephalumand of Leptorhyncho.s(Table l). Leiocarpa appears to have polyploid numbers on a base of x = 10, whereas both Chrysoceplulum ar'd Leptorhlnchos appearto have mostly diploid numberson the baseof x = 12. Table l. Summaryofchronosome numberrecordsin Chrysoceplnlum, LeiocarpaandLeptorhynchos. Taken from Watanabcet al. (1999) which includesthose published by Turner (1970). Currentname and recorded name Chromosomenumber ChrysocephalumaJf. adpressum (W. Fitzg.) Anderb. n=24 C. apiculatum(Labill.) Steetz n=12,c.38 C. semipapposum(Labill.) Steetz n= 12 Chrysocephalumsp. n=12 Leiocarpaleptolepis laslxiolaenachloroleucal n=20 Leioca rpa tonxento sa las I xiol aena tomentosaf n=20 Leiocarpa senicalva fas LePtorhynchosambiSuusl n=c.38,c.40 Leiocarpavtebsteri las lxioLaenaleptoLepisl n = 20,c.21,30 LeptorhynchzsbaiLeyi F. Muell. n= 12 Leptorhynchosscabcr (Benth.) Haegi [as L. medius\ Lepto rhynchos scluanalas(Labill.) Less. l= 12 Leptorhyncho s w4itzi.r Sond. Mycorrhizal associations Work by Warcup ( 1990)and McGee ( 1986)on mycorhizal associationsin the Australian Inuleae has shown that while those species of Chrysocephalum and Leptorhynchos that were studied (r.e. C. apiculatum (Labill.) Steetz,C, semipapposum(Labill.) Steetz C. pterochaetum F. Muell., HelichrysumramosissimumHook.l=Chrysocephalum sp.\,L. squamatus(Labill.)Less ' a\d'L' wqitzia Sond.) form both ectomycorrhizaland vesicular-arbuscularmyconhizal associations,those species that were examinedthat are hereplaced in Leiocarpa (i e. L. ambigua,L. breviconxpta,L. lePtolepis, and L supina) form only vesicular arbuscular mycorrhiza. Warcup observed that mycorrhizal relationship in generalcorrelates with taxonomic relationship,which, if correct, suggeststhat those speciesstudied that are here placed in leiocarpa are geneti.callydistinct from those studiedthat ale placed in the other two genera. The mycorrhizal relationship of lxiolaena virrcosahas not been recorded. 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Receptaclenaked, convex or conical. ,Florcls bisexual or the outer female; corolla tube slenderbelow, narrowly turbinateto campanulateabove, shortly exceedingthe bracts,usually yellow; lobes5 (3 or 4 in female),smooth withifl. Anther tails lorgandfirm. Styleapex truncate to rounded. Cypselasterete or somewhatcompressed, 2-4-ribbed, not beaked; pericarp cartilaginous, striatc, with scatteredpaired linear transparentcells among linear translucentcells, smoothor sparselyglandular and with a fcw minuteunicellula rhalrs. Pctppus bri,stleslinear to liliform, barbellate,persistent. An Australianendemic genus of ten species. Etytnology. The genericname is derived from the Greek words - leior smooth and co4pos- fruit; it refers to the smooth cypselasthat are typical of this genus. Nole.r, The pericarphas the appearanceofcontaining many linear clearwindows setinto a translucent background. When mature, the pericarp disintegratesinto linear (and presumably one-celled) fiagments. Details of thesecclls in transverscsection are given by Short et al. (1989). Unlike