本論文對台灣產鴨跖草科植物進行分類研究，研究結果將台灣產鴨跖草科植物處理為8屬25種，將Cyanotis kawakamii Hayata新組合為Belosynapsis kawakamii；將Murdanniatriquetra (Wall.) Br(ckn.併入Murdannia keisak (Hassk.) Hand.-Mazz.，並報導1個新記錄種：Cyanotis axillaris (Linn.) Roem. et Schult.；1個新種：M. taiwanensisPeng var. taiwanensis及一個新變種：M. taiwanensis var. lilungensis Y. J. Chen。 在外部形態方面，種子形態是區別省產鴨跖草科植物的重要特徵，花瓣、可稔雄蕊、退化雄蕊及果實形態可作為屬間分類依據，並可提供作為種間分類參考，此外植株生長型、根、莖、葉形態及花序類型也有助於區分近似種。在花粉形態方面，花粉大小、外壁紋飾及溝膜大小是區分省產鴨跖草科植物屬間及種間的重要依據，但Murdannia屬內植物花粉類型則十分相似，僅可供分類參考。花粉可稔性測試結果發現省產Belosynapsis ciliata及Commelina diffusa之部分族群花粉不稔。細胞學研究顯示省產Amischotolype屬植物n = 9；Belosynapsis屬植物n = 13，但B. ciliata n =8；Cyanotis屬植物n = 12；Commelina屬植物除Co. benghalensis及Co. communis n = 11外，其餘種類n = 15，Murdannia屬植物以n = 10為主；Pollia屬植物n = 16；Rhopalephora屬植物n = 29。其中B. ciliata及Floscopa scandens減數分裂時期出現四價體；Pollia japonica在惠蓀林場的族群出現各種多價體；M. angustifolia具有n = 19及n = 20的花粉細胞。本研究首度報導B. kawakamii為n = 26；M. angustifolia 為n = 19, 20；M. bracteata 為n = 9；M. taiwanensis為n = 28；M. taiwanensis var. lilungensis 為n = 28，另外，A. hispida 為n = 18F. scandens 為n = 10 II + 1 IV，M. edulis 為n = 21，P. miranda 為n = 16，與前人報導不符。

In the course of a taxonomic revision of the Commelinaceae in Taiwan, 25 species in eight genera were recognized, including a new species and anew variety of Murdannia and a new record, Cyanotis axillaris (L.)Sweet.Murdannia triquetra (Wall.) Br(ckn. was synonymized with Murdannia keisak(Hassk.) Hand.- Mazz. A new combination, Belosynapsis kawakamii, was madeof Cyanotis kawakamii Hayata. In this study, seed morphology was shown to be important in distinguishingplants of Taiwan Commelinaceae. Morphology of petals, stamens (both fertile andsterile), and fruits are diagnostic at generic and sometimes specific level.Plant habit, roots, stems, leaves, and inflorescence types are often useful indistinguishing related species. Pollen size, exine sculpture, and sulcalmorphology are useful in sepannia, in which pollenf all species are similar.All but a number of populations of Belosynapsis ciliata and Commelina diffusaexamined have stainable pollen. Studies of chromosome cytology reveals that Taiwanese Amischotolype isbased on n = 9. Belosynapsis has a basic chromosome number of n = 13, althoughB. ciliata has n = 18. Cyanotis is based on n = 12. Commelina has n = 15 in allbut Co. benghalensis and Co. communis, which have n = 11. Murdannia has n= 10,with possibly derived aneuploid chromosome numbers in several species. Polliahas n = 16. Rhopalephora is based on n = 29. Tetravalents were observed inmeiosis of Belosynapsis ciliata and Floscopa scands. First reports on chromosomenumbers include Belosynapsis kawakamii (n = 26), Murdannia angustifolia(n = 19, 20), M. bracteata (n = 9), Murdannia taiwanensis (n = 28), and Murdanniataiwanensis var. lilungensis (n = 28). Counts of n = 18 for Amischotolype hispida,n = 10 II + 1 IV for Floscopa scandens, n = 21 for Murdannia edulis, and n = 16for Pollia miranda disagree with previous reports.