- 期刊
Sinosenecio jiangxiensis (Asteraceae), a New Species from Jiangxi, China
中國江西產蒲兒根屬一新種：江西蒲兒根
摘要
本文描述了中國江西產蒲兒根屬一新種：江西蒲兒根（Sinosenecio jiangxiensis Y. Liu & Q. E. Yang）。其體細胞染色體數目為2n＝48。核型公式為2n＝42m＋4sm＋2st(2sat)。本新種在葉形、葉背毛被和瘦果毛被方面與廣西蒲兒根（S. guangxiensis C. Jeffrey & Y. L. Chen）以及白背蒲兒根（S. latouchei（J. F. Jeffrey) B. Nord.）相似，但以植株和葉片均較小，莖葶狀，無葉或僅在近中部具1枚苞片狀葉，頭狀花序通常1而與後兩者相區別。利用ITS序列進行的系統發育分析表明，江西蒲兒根與廣西蒲兒根、九華山蒲兒根（S. jiuhuashanicus C. Jeffrey & Y. L. Chen）、白背蒲兒根、岩生蒲兒根（S. saxatilis Y. L. Chen）以及武夷山蒲兒根（S. wuyiensis Y. L. Chen）相近，可能與九華山蒲兒根、白背蒲兒根以及武夷山蒲兒根最為近緣。本文詳細比較了這些種類的特徵並提供了分種檢索表。
並列摘要
Sinosenecio jiangxiensis Y. Liu & Q. E. Yang, a new species from Jiangxi, China, is described and illustrated and its chromosome number (2n=48) is reported. The karyotype is formulated as 2n=42m+4sm+2st (2sat). Sinosenecio jiangxiensis is similar to S. guangxiensis C. Jeffrey & Y. L. Chen and S. latouchei (J. F. Jeffrey) B. Nord. in leaf shape, abaxial leaf surface indumentum and achene pubescence, but differs in its smaller stature, smaller basal leaves, stem leafless or bearing only 1 bract-like leaf near the middle and thus more typically scapiform, and usually solitary capitula. Analysis of ITS sequences further confirmed the distinction of S. jiangxiensis and also revealed that S. jiangxiensis is closely related to S. guangxiensis, S. jiuhuashanicus C. Jeffrey & Y. L. Chen, S. latouchei, S. saxatilis Y. L. Chen, and S. wuyiensis Y. L. Chen, with S. jiuhuashanicus, S. latouchei and S. wuyiensis being the closest relatives. A detailed comparison of these species is made, and a key to them is provided.
延伸閱讀
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