Sinosenecio Baojingensis (Asteraceae), a New Species from Hunan, China

中國湖南產蒲兒根屬一新種：保靖蒲兒根

劉瑩(Ying Liu) ； 陳功錫(Gong-Xi Chen) ； 楊親二(Qin-Er Yang)

《Botanical Studies》 50卷1期 (2009/01) Pp. 107-113

摘要

本文描述了中國湖南西北部產蒲兒根屬一新種：保靖蒲兒根(Sinosenecio baojingensis Y. Liu & Q. E. Yang)。本新種與S. euosmus, S. denticulatus相似，但以植株高大，葉卵狀心形不分裂，葉柄基部僅擴大，不成耳狀而與這兩者明顯有別。其體細胞染色體數目為2n=48。本文提供了保靖蒲兒根的彩色圖版、線繪圖、花部微觀性狀的光鏡照片以及地理分佈圖。

關鍵字

染色體數目 ； 菊科 ； 花部微觀性狀 ； 千里光族 ； 保靖蒲兒根

並列摘要

Sinosenecio baojingensis Y. Liu & Q. E. Yang, a new species of Asteraceae from northwestern Hunan, China, is described and illustrated. Its chromosome number (2n=48) is reported here. The new species is similar to S. euosmus and S. denticulatus in having leafy stems and smooth achenes bearing a pappus. It differs from S. euosmus in its much taller stature (75-150 cm vs. 20-75 cm), the ovate-cordate outline of its leaves (vs. ovate to broadly ovate), its denticulate (vs. crenate) margin, and its much larger size (12-20×10-18 cm vs. 2-5×3-6 cm). From S. denticulatus it differs in its sometimes taller stature (75-150 cm vs. 35-140 cm), and ovate-cordate (vs. reniform) leaves, denticulate (vs. dentate) margin, and its larger size (12-20×10-18 cm vs. 4-14×6-17 cm). From both it differs in having undivided (vs. more or less lobed) leaves and basally expanded but never auriculate (vs. auriculate) petioles. A color plate, line drawings, distribution map, light microscope (LM) photomicrographs of floral characters, and a key to aid in the identification of S. baojingensis and its possible relatives are provided.

並列關鍵字

Asteraceae ； Chromosome number ； Floral microcharacters ； Senecioneae ； Sinosenecio baojingensis