臺灣新紀錄植物——薩摩細辛（馬兜鈴科）

Asarum satsumense F. Maekawa (Aristolochiaceae), a Newly Recorded Species in Taiwan

本文報導臺灣產馬兜鈴科細辛屬新紀錄植物-薩摩細辛。本種原本僅知分布於日本九州鹿兒島地區，為當地特有種；最近我們發現其亦分布於臺灣苗栗與台中一帶。本種與臺灣特有之大花細辛頗為相似，但可由壓扁之西洋梨形的花被筒、較大之花被筒開口，花被筒內特殊之網紋形式（花被筒上半部具棋盤格狀脊形隆起，下半部僅具縱向脊形隆起）以及花粉具較多的上頂蓋瘤突與大花細辛區別。本文提供該種之形態描述、手繪圖、體染色體數目、花粉SEM圖片、地理分布、花部特徵照片以及與大花細辛之詳細比較以供鑑定參考。

The present paper reports a newly recorded Asarum, A. satsumense F. Maekawa, collected from Taiwan. This species was for merely recorded as an endemic species in Kagoshima, southern Kyushu, Japan. However, recently it was found in northwestern Taiwan, Miaoli and Taichung Counties. Asarum satsumense resembles A. macranthum Hook. f. of Taiwan, but can be distinguished by having a more depressed pyriform perianth tube, larger perianth tube entrance, tessellate-reticulate apically but longitudinally thick-ridged basally inner surface of perianth tube (vs. tessellate throughout the inner wall), and denser supratectate warts on pollen grains. Taxonomic description, line drawing, pollen SEM plates, chromosome number, distribution information, and color photographs of floral characters of this newly recorded species are provided to aid its identification.