[[alternative]]A taxonomic study of Alpinia Roxb. (Zingiberaceae) of Taiwan

[[abstract]]本論文共處理臺灣產月桃屬植物14 個類群及一未確定類群。長穗月桃 ( A. dolichocephala ) 及濁水月桃 (A. schumanniana) 分別併入島田氏 月桃(A. shimadai) 及月桃 (A. zerumbet)；將川上氏月桃 ( A. kawaka- mii ) 與考氏月桃 (A. copelandii)分開，並處理為島田氏月桃(A.shima- dai) 之型(forma) ；屈尺月桃 (A. kusshakuensis) 與烏來月桃(A. ura- iensis) 分開﹔將阿里山月桃 (A. sessiliflora) 處理為普來氏月桃 (A. pricei) 之變種。另外確定兩個疑問種──角板山月桃(A. mesanthera)及 通洛月桃 (A. tonrokuensis) 之存在。其中臺灣月桃、屈尺月桃、角板山 月桃及通洛月桃等四分類群具中間型形態， 疑似為雜交種。依據外表形態 ﹐尤其是花序及唇瓣之特徵﹐將這些種類歸屬於4 個亞節。 除傳統之形態特徵外﹐ 本研究另觀察染色體數目、花粉形態、地理分 布及生殖週期，並首次報導11個分類群之染色體數目。 省產本屬植物之染 色體皆為 2n =48 (四倍體)，無種間差異；大部份種類之花粉可染率在90% 以上，但前述4 疑似雜交類群則僅35-65 % ，可支持形態觀察之推論； 而 共域分布、 花期重疊及同數染色體之現象或為導致雜交之有利因子，唯仍 需進一步研究以證實之。 The genus Alpinia Roxb. (Zingiberaceae) of Taiwan is taxono- mically treated as fourteen taxa and one infficiently known species in this study. A. dolichocephala and A. schumanniana are treated as synonym of A. shimadai and A. zerumbet respectively. A. sessiliflora and A. kawakamii are newly combined as A. pricei var. sessiliflora and A. shimadai form. kawakamii respectively. A. kawakamii and A. kusshakuensis are divided from A. copelandii and A. uraiensis respectively. Besides, two doubtful species i.e A. mesanthera and A. tonrokuensis are confirmed. Among them, A. formosana, A. kusshakuensis, A. mesanthera and A. tonrokuensis appear to be natural hybrids based on their intermediate morpho- logical characters. Besides morphology, this study observes chromosome number, pollen morphology, geographical distribution and floral phenolo- gy. There are eleven taxa which chromosome number are firstly reported here. The chromosome numbers of Taiwan species are all same i.e. 2n=48 (tetraploid). The pollen stainability is higher than 90% in most species, but lower than 65% (35-65%) in those doubtful hybrids mentioned above. This support the result of morphological characters. Sympatric distribution, overlap of fl- oral phenology and the same number of chromosome may be the fav- orable factors of hybridation, but it is necessary to study more that hybridation is confirmed. The genus Alpinia Roxb. (Zingiberaceae) of Taiwan is taxono-