臺灣柳屬植物之訂正

Abstract

本文訂正台灣?柳屬植物為水社柳、水柳、薄葉柳、褐毛柳、白毛柳、台灣山柳、高山柳、玉山柳、關山嶺柳等九種和一未確定分類群，並分屬於紫柳節、褐毛柳節和關山嶺柳節，褐毛柳節再分成褐毛柳亞節和台灣山柳亞節。其中修訂薄葉柳之學名，創立關山嶺柳節及降低台灣山柳節為亞節階級。 外部形態如植株習性、葉綠及葉尖、葉下被毛形式和毛色、子房被毛與否、子房胚珠數、子房柄與苞片相對長度為臺灣柳屬植物分類之主要依據，花粉特徵研究結果亦支持外部形態之處理，生態和地理分佈則提供分類處理之基礎背景，數示分析評估顯示區分上述三節和兩亞節甚為合理。各節內常見中間型個體，而褐毛柳亞節內更呈連續變異。

In the present revision of Salix L. of Taiwan, nine species are recognized: Salix doii Hay., S. fulvopubescens Hay., S. kusanoi (Hay.) Schneider, S. morrisonicola Kimura, S. okamotoana Koidz., S. tagawana Koidz., S. taiwanalpina Kimura, S. takasagoalpina Koidz., S. warburgii O. Seem., plus one uncertain taxon. They can be assigned to three sections, i.e. Wilsonianae Chao, Okamotoanae Yang and Fulvopubescentes C. F. Fang which is further divided into two subsections, i.e. Fulvopubescentes, Taiwanalpinae (C. F. Fang) Yang. One nomenclatural revision, S. doii; one new section, Okamotoanae; and one transfered rank, Taiwanalpinae are proposed. The taxonomic treatment is based mainly on the morphological characteristics such as habit, leaf margin, leaf apex, the vesture types and its colors of the leaves, the presence or absence of the pubescense on the ovary, the number of the ovules per ovary, the length ratio of stipe to bract. The palynological evidence supports the morphological result. The ecological study and distributional pattern also serve as excellent taxonomic background for this genus. The divisions of sections and subsections are also reconfirmed by numerical analyses. The intermediate individuals are common within each of the three sections, what's more, the possible introgresive variations within the subsection Fulvopubescentes are observed.