Page 47 - 《广西植物》2020年第10期
P. 47

1 4 3 0                                广  西  植  物                                         40 卷
       地区别:黄进报春苣苔具有更短的、长 2.5~ 6 mm 的苞片(vs. 短序报春苣苔具有长 15 ~ 30 mm 的苞片ꎬ顺序
       下同)ꎻ花萼裂片等长(vs. 不等长)ꎬ花丝基部附近膝状突起ꎬ中部以上具腺毛(vs. 于中部膝状突起且无毛)ꎻ
       柱头倒三角形ꎬ深 2 裂成 2 线形裂片(vs. 片状ꎬ稍 2 浅裂ꎬ裂片为三角形)ꎬ侧膜胎座(vs. 中轴胎座)ꎮ 加上
       该新种在内ꎬ丹霞山目前共记录有 6 种报春苣苔属植物ꎬ其中丹霞小花苣苔(P. danxiaensis) 和该新种均为
       丹霞地貌特有植物ꎮ 黄进报春苣苔目前在丹霞山的两个地方有发现ꎬ成年植株不超过 200 株ꎬ根据 IUCN 红
       色名录标准ꎬ属于极危种ꎮ
       关键词: 丹霞ꎬ 长蒴苣苔亚科ꎬ 广东植物区系ꎬ 形态学比较ꎬ 短序报春苣苔



                                                     K. F. Chung (Shen et al.ꎬ 2010ꎻ Xu et al.ꎬ 2012)ꎬ and
   1  Introduction                                   Viola hybanthoides W. B. Liao & Q. Fan (Fan et al.ꎬ
                                                     2015). The endemism in this unique Danxia landform also
       The redefined Primulina Hanceꎬ based on the   arouse people’s interests in the biodiversity patterns.
   re ̄circumscription of recent molecular phylogenetic   Since  2004ꎬ  we  have  conducted  continuous
   studiesꎬ is the largest genus in the subfamily    biological surveys on Mount Danxia in order to elucidate

   Didymocarpoideae of Gesneriaceae with about 204 +  the biodiversity patterns of Danxia landforms (Peng et
   species (including subspecies and varieties) in China  al.ꎬ 2011). During the expeditionsꎬ a distinct Primulina
   ( Wen et al.ꎬ 2019ꎬ 2020 )ꎬ including nearly all  species was collected by the third author ( JQG) in
   previous species of Chirita sect. Gibbosaccus Clarkeꎬ all  2016. Including this putative new taxonꎬ a total of six
   species of Chiritopsis W. T. Wangꎬ and two species of  Primulina species occur in Mount Danxia. The rest are
   Wentsaiboea D. Fang & D. H. Qin (Wang et al.ꎬ 1998ꎻ  P. danxiaensisꎬP. depressa (Hook. f.) Mich. Möller &
   Fang & Qinꎬ 2004ꎻ Möller et al.ꎬ 2011ꎻ Wang et al.ꎬ  A. Weberꎬ P. rotundifolia ( Hemsl.) Mich. Möller &
   2011ꎻ Weber et al.ꎬ 2011ꎻ Xu et al.ꎬ 2012ꎻ Wang et  A. Weberꎬ P. fimbrisepala (Hand. ̄Mazz.) Y. Z. Wangꎬ
   al.ꎬ 2017). Its species diversity is still growing rapidly  and P. eburnea (Hance) Y. Z. Wang(Wang et al.ꎬ 1998ꎻ

   due to   numerous  new  species  being  constantly  Wei et al.ꎬ 2010ꎻ Möller et al.ꎬ 2011ꎻ Weber et al.ꎬ
   discovered and described since the past decade (Yang et  2011ꎻ Wang et al.ꎬ 2011). At the first glanceꎬ the
   al.ꎬ 2018 ). Interestinglyꎬ more than 170 Primulina  putative new taxon looks similar to P. depressaꎬ which is a
   species are endemic to limestone karsts of South to  relatively common species on Mount Danxia. Howeverꎬ
   Southwest China and North Vietnam (Wang et al.ꎬ 2017ꎻ  after two years’ field observations and the comprehensive
   Xu et al.ꎬ 2017ꎻ Hong et al.ꎬ 2018ꎻ Wen et al.ꎬ 2019).  literature studiesꎬ we confirm that it is a new species and
       Mount Danxia in Guangdong Province is one of the  obviously distinguished from P. depressa. Thereforeꎬ it is
   famous examples of Danxia landform characterized by red ̄  described and illustrated here.

   colored  sandstones  and  conglomerates  of  largely
   Cretaceous age. In the past three decadesꎬ five endemic  2  Materials and Methods
   plant species were found thereꎬ namelyꎬ Danxiaorchis
   sinchiana J. W. Zhaiꎬ F. W. Xing & Z. J. Liu (Zhai et  Morphological observations of the new species and
   al.ꎬ 2013)ꎬ Diospyros danxiaensis (R. H. Miao & W.  its close relatives were carried based on living plants in
   Q. Liu) Y. H. Tong & N. H. Xia. (Zhao et al.ꎬ 2018ꎻ  the field as well as dry specimens. High resolution
   Tong & Xiaꎬ 2019)ꎬ Firmiana danxiaensis H. H. Hsue &  image of the holotype specimen of Primulina depressa
   H. S. Kiu ( Xu et al.ꎬ 1987)ꎬ Primulina danxiaensis  (deposited in Kꎬ barcoding number K000858361) was
   (W. B. Liaoꎬ S. S. Lin & R. J. Shen) W. B. Liao &  consulted on JSTOR Global Plants (https:/ / plants.
   42   43   44   45   46   47   48   49   50   51   52