臺灣豆科硬皮豆屬之註解與新歸化種——腋花硬皮豆

Notes on the spread of the genus Macrotyloma (Wight & Arn.) Verdc. (Fabaceae) in Taiwan: description of a newly naturalized species M. axillare (E. Mey.) Verdc.

硬皮豆屬（Macrotyloma（Wight & Arn.）Verdc.）植物花為黃綠色、黃色至乳白色，總狀花序極度短縮而看似花朵簇生於葉腋，可與其他豆科植物區別。原本臺灣植物誌僅記載長硬皮豆（M. uniflorum（Lam.）Verdc.）一種，本文描述另一種臺灣新歸化的腋花硬皮豆（M. axillare（E. Mey.）Verdc.）。腋花硬皮豆全株具伏貼毛、旗瓣較大（12–15×9–12 mm）、花萼裂片先端三角形，可與長硬皮豆區分。本文提供腋花硬皮豆的特徵描述、彩色照片和線繪圖以供鑑定參考。

The yellow-green/yellow-to-cream flowers of plants belonging to the genus Macrotyloma (Wight & Arn.) Verdc. (Fabaceae) form characteristic fascicle-like racemes by which they can be distinguished from other Fabaceae species. Only one species of the genus, Macrotyloma uniflorum (Lam.) Verdc., has been recorded in Taiwan in the past. Here, we report a newly naturalized species, Macrotyloma axillare (E. Mey.) Verdc., which could be distinguished from M. uniflorum by a larger (12–15 × 9–12mm) standard, triangular calyx lobes and stems and leaves covered with appressed hairs. The taxonomic description, color photographs and line drawings of M. axillare are provided to facilitate its identification.