Taxonomic studiesin Thomasiaand Lasiopetalum(Sterculiaceae) by Susan Paustx Abstract Four newspecies of fromartaaod six new species of Lasiopetalumare described; Thomasiaformosa sp. nov., 7' gardnerisp. nov., T. mictophJllasp. nov., 7' trcmandroidessp. nov., Lasiopetalumcardiophyllum sp. nov., a. compactum sp. nov.,.1!. glabratum sp. nov.,L. linaaresp. nov.,-L. monticola sp. r1ov.and L. rotundiJbtiuntsp. nov. Two speciesof J,ctsiopetalnmare reduced to synonymy:L. angustifoliumN. \. Fitzg.is synonymous.r'tilli' L. oppositdoliunF. Muell.:and Z. acatiforumTutcz with -L.rrdutrm SteLld. All specimenscited are housed at PERTH, exceptwhere otherwiseindi- cateo. Thomasia tremandroidesS. Paust sp. nov. (Figures I and 11) (tremandroides: resemblingsome species of Tremandraceae) Folia ovata,brevissime petiolata, 4 8 x 2 5-5 mm stellato_tomentosa.Stipulae foliaceae, 2.5 mm loneae. RarcfiusoiTis stellatis et simpliclmoniliformibustomentolus rracl?o1a? 3. aneu.telineares. calycen'i rubtu.. Cd4\ 8 mm longuq,.lellalo-hirsulu\ lobis 5 ovatis P?tdd5,spathulala, I mmlonEa. ANherce5, fere sessiles, anguste triangulares, 3 mm longae. Stumin;diA5, ctavata,I mm longa. Ovafiun 3-loculare,I mm longun,pilis glandulosiset stellatissparcim tomentosum. ,Sllltrs 2 mn1longus, glaber. Trpe: 33 mi N of Wubin towardsPerenjori, Western Australia, 8 Oct. 1972,S. Paust1319. Holo:PERTH: iso: CANB, K. Erect, multistemmed, woody perennial, l0 60 cm high. Brqnchlets tomentose with stellate and simple-moniliform hairs. Leaves alterrlale:, petiole minute; lamina ovate, charlaceous, 4 8 mm long, 2 5 5 mm wide, stellate-tomentose; margin undulate, slightly recurved. Sttprilesfoliaceous, ovate-orbicular, often oblique, 2 5 mm long. Racemesleaf-opposed, 20 40 mm long, 1 4 flowered, indumentum similarto that ofthe branchlets;peduncle l0 30 mm long; pedicel 3 ? mm long; braclslinear, 2 mm long; bracteoles3, narrow linear, 5 mm long, subtending calyx. Calyx angular in bud, mauve-pink, exduplicate and papery at anthesii, 8 mm long, stellate-hairy, divided to below the middle into 5 ovate lobes, ribs thickened especially at base. Petals 5, spathulate, I mm long, purple-black. Anthers 5, almost sessile,narrowly triangular, 3 mm long, purple-black. Staminodes5, obscured by anthers, clavate, I mm long, alternate and basally connate with stamens. Ot4ry globose,I mm long, purple-black, with scattered simple, glandular and stellate haiN, 3-celled; style lilifbrm,2 mm 1ong,glabrous, yellowish; ovules3-4 per locule. Se?dnot seen. DistribLttion: South-west Western Australia; from Bencubbin north to the Murchison River. MurchisonRiver, Oct. 1961,de la Huntti BoolardyStation, l. B. Cashmore128; Canna, C. A. Ga ner 2691;near Morowa, I/. E. Blackall2817, I mi S of Caron,,S Pdr611309; 9 2mi E of BindiBindi. S. Par?rl 1026; 6 mi S of Ballid:u,J. W Green191:13mi N of Ben- cubbin,lY. E. Blackall33u; (?) Mi. Barkerto walpole,3l Aug. 1965,F. ll. Humphrevs. (It is extremelydoubtful that the collectiondata of the Humphreysspecimen arc correct.) Thomqsicttremandroides is distinguished from other species of Thomasia by its small papery ovate leaves and by the presence and morphology of its stamtnocles. * Prcsentaddress: Mrs. R. Downes, Cleator, Cumberland,England. 348 6t€ '6ItI '^ou'ds lsned S-_editcloH salro.tpuDut))tDtsttutarLl I errtBtJ stl D]S 'slf Htf rdL\ IUrsdlr NviJif sil I. rl' r\\ Iut @! r,rg 44.6r,.4,,,.t elr tr" '3r 1"',4a T',"! d'{' 5..7 :Y:.- :1," '3r .drn--dr,-- ti&pi e11 fr: '3r leJ ue: es( lel'ot: 's!l .:4. 8l;ril obli, subt long Ow Tvp, Hol Ere inflr lonl maI lonl brar lonl pinl 5or glat 3.5 stYl, Dis, coll Ster agj flou I5- Brcc carnr 3mr ,* dens - ooLot"ou Type 4g$ Geor Erec inflc sligl corc anc l0-r brac subt stell larl) lobe Stq shor t€ret 3-cel ovul C. Chapman. Fig:rle 2 Thomdsiafarmora sP.nov. 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