Sinosenecio jiangxiensis (Asteraceae), a new species from Jiangxi, China

Sinosenecio jiangxiensis (Asteraceae), a new species from Jiangxi, China
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江西中华千里光(菊科),中国江西一新种

DOI:
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发表时间:
2012-07
期刊:
影响因子:
3.4
通讯作者:
杨亲二
杨亲二
中科院分区:
生物学3区
文献类型:
--
作者:
刘莹;杨亲二

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报道了江西一新种Sinosenecio jiangxiensis Y. Liu和Q. E. Yang,并报道了其染色体数目(2n=48)。核型公式为2n=42m+4sm+2st (2sat)。Sinosenecio jiangxiensis与S. guangxiensis C. Jeffrey & Y. L. Chen和S. latouchei (J. F. Jeffrey) B. Nord相似。在叶形上,叶背面被毛被和瘦果短柔毛,但不同的是其较小的高度,较小的基生叶,茎无叶或仅在靠近中部的1苞片状叶,因此更典型的穗状,通常单生头状花序。ITS序列分析进一步证实了江南山雀的区别,并揭示了江南山雀与广西山雀、九华山山雀C. Jeffrey & Y. L. Chen、拉头切山雀、萨克斯山雀Y. L. Chen、武夷山雀Y. L. Chen亲缘关系较近,其中九华山山雀、拉头切山雀和武夷山雀为最近亲缘关系。对这些物种作了详细的比较,并提供了了解它们的钥匙。
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.
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