NUMERICAL VARIATION OF FLOWER PARTS AND THE AXILLARY FLOWERS IN WOONYOUN GIA SEPTENTRIONALIS (DANDY) LAW
焕镛木花部数量变异和腋生花现象

Flowerlocation,sex ratioand numericalvariationof the flowerpartsof Woonyoungia septen trionalis(Dandy)Law,an endemicspeciesin China,wereinvestigatedby randomsamplingtrees fromnaturalpopulationof Woonyoungia septentrionalis inMulunVillage,HuanjiangCounty(Guangxi Province).Althoughmostof theflowers(90%)wereterminalas previouslydescribed,a smallfraction(10%)werefoundto be axillary,whichwas not recordedpreviously.The ratioof maleto female individualswas1.21:1.Statisticresultsfrom600flowersin20individualsfrom introducedtreesin SouthChinaBotanicalGardenandfromnaturalpopulationin Mulunshowthatthenumberof flower parts,exceptthenumberof thecaeperstamenandthenumberof ovulespercarpel,is variable.The variationsare:2-6tepalsin oneor two whorls,81-152stamensin maleflowers,two whorlsof tepals,2-4intheouterwhorl,5-13intheinner,and3-8carpelsinfemalflowers.Two thecaeineachstamen,andtwoovulesineachcarpelaretheonlystablecharacters.Greatvariationinfloralcharactersindicates thatthisspeciespossesseshighgeneticdiversity.The phylogeneticsignificanceof co-occurrenceof axillaryand terminalflowers,the heterobathmyof floralcharacters,and the tenabilityof the genus Woonyoungia arediscussed.