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S.diceratum 2 Gynostcmiumwith l appcndage;corolla white or pink on adaxialsurfacc...............................3 3: Gynostemiumbearing a recurvedhorn shaped appcndage on thebend....................................4 3 Gynostemiumappcndage not horn-shaped .. 5 4: Throat appendages2; labellumclliptic, apexnot emarginatc, irregularlyserrate .....S. calcaratum 4 Throatappendages 4; labellumlagcniforrn, apex emarginatc, not serrate.............. S. weeliwolli 5: Gynostemiumappendlge reniform, recurved from thebend; nectaryspur prominent, cradled by the horizontalposterior sepal........................ S.mimeticum 5 Gynostcmium appcndagcsquare, recurved from the bend, apex irregularly scrrate;ncctary spur absentor very poorly developed and hiddenbehind the alwaysvertical posterior sepal....... ...........S. ecorne 6: Corolla orangc; posterior corolla lobes each deeply dividcd into 2 (soas to appearas 4 individuallobes).................... ...........S.ceratophorum 6 Corolla white to pink; postcriorcorolla lobes undivided ...........................7 7: Plantsmostly 1.5-2.5crn high; nectaryspur abscnt............ S.perpusillum 7 Plantsmostly 4.5 25 cm high; ncctaryspur present .. 8 8: Posteriorcorolla lobcs cuncale, the apexobtuse and unlobcd,with a distinctiveblunt lateraltooth at the basc....................... .........S. edenlatum 8 Posterior corolla lobes either cuneatewith a tridentateapex or obovate with a crenateapex, lacking basal tooth............. .........................................9 9: Plantsmostly 5 9 cm talli postcriorcorolla lobes cuneatc, apex tridentate; nectaryspur shortcr than the posteriorsepal ....................... .......S. aceratum 9 Plantsmostly l0-25 cm tall; postedorcorolla lobes obovate, apex crenate; nectaryspur longcr than thc posteliorsepal ....................... ....S.longicornu Stylidium aceratum Lowrie & Kenneally,qr. /lor. Stylidio calcqrqto R. Br. affinis sed cornu appendicise flexo gynostemii absenti. ?ypus. Great Northem Highway, north of Bullsbrook fpreciselocality withheld], Wcstern Australia, 9 Novcmber 1991,A. Lowrie 496 (.holo: PERTH 04980336;lso: MEL). A fibrous-rooted annual herb 5 9 cm high (including infloresccnce);stem translucent white, 2.54 mm long, 0.8 I mm diam.; basal rosetteof leavesflat, 5-12 mm diam. Leayes spathulate, 3 6 mm long, 0.7 1.5 mm widc nearapex, 0.3-0.6 mm wide at the base,flat in section,glabrous. Inflorescenceusually a simpledichasium but alsothc beginningsof a compounddichasium in older plants,5-9cm long(including peduncle), glandular. 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VA\ tuo{ r/rrrpr rS ^{.u :r:rllJ C ) 2p .oao-t V N/./)hizr Vol. 12, No. 2 (1998) *v I B A. Lowrie 1998 Figurc 1. .5/llidrr?rar.r'drrrr. A hrbit ol llolvcriDgplant; B - leaf, eDlafgedsecli{tr lelt; C hypanthium and sepals; D laleralview ol-corullir,gynoslcrrinrn and hypanlhium;E corollar F throat appcndagcs; G - tabellurniH - laloralviclv of gyrostemium,anthcrs and slipilalcst;gma in lhe set non triggefedposition Scaie bar for all = | nnn. DrarvD lrc.|' A. It^rriz 4')6. i 'DlloJipuatd 'DrnpDr "8ztlC Da t^argpuuotolltuustlqtg'nxopatDtl 61 Dt)soro A,^d 'wnJoUdopJal wndocsuqnt S M/ip4fJS:qlr,r {eetr lo s-ur8lrru cql uo slros {puus ut s,\\olD lrt?qrll 'uolluJoledll eqt uol1 ,{1uourrJuy uounqlJtsl1 (HJuEd) gEz 112.'!Dfi0 n't661 '[pteqqtr,ti 8nV ,{lrlucolesl..rd] uoilccoled,{a:yllylllgnV NUEISA,11pa ttnora uatuttadst atltll 'ru€lpgl ipro^o (Z orn8rC) peqqu^leurl ,(1leurpn1r8uol 0-1 0'8uol rlrurt 0 Z 0 pcssordruoc+ 'u,lroJq,{tsnJ 'asoqot8 'iuo1 ,srcqtue .tpaasuurp rurut g Z a1nsdo1a44 qsnlqxcdu urur 1 f, aql uee,,rlteqatB]rdts Bur8rts :urnrurelsou,{3
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