Page 44 - 《广西植物》2020年第10期
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10 期                 张贵良等: 云南东南部苦苣苔科植物一新种———南溪蛛毛苣苔                                        1 4 2 7

       Phenology: Flowering from July to Augustꎻ     white below the middle ( vs. two yellow patches
   fruiting from September to December.              underside of tube near base )ꎻ filament glabrous
       Distribution & Ecology:Paraboea nanxiensis is  (vs. glandular puberulent)ꎬ and capsule slightly twisted
   found from Hekou County and Maguan County with    (vs. not twisted). Additionallyꎬ the new species grows

   two separate populations in southeastern Yunnan   in the altitude of 530-610 m in southeastern Yunnanꎬ
   Provinceꎬ near the border between China and       while its congener grows at an altitude of 900-1 150 m
   Vietnam. It grows on the surface of the moist rocks  in Guangxi. It also resembles P. trisepala W. H. Chen &
   under the tropical rainforest in limestone area with  Y. M. Shui from Guangxi in the shape and indumentum
   other lithophytic plants ( e. g. Adiantum L.ꎬ Begonia  characteristic of leaf bladeꎬ but obviously different in
   L.ꎬ and Elatostema J. R. Forster & G. Forster).   the three calyx lobes and straight capsule of the latter
       Etymology: The specific epithet “nanxiensis” is  (Chen et al.ꎬ 2008) (Fig. 2: F). There are also two
   derived from the name of the type localityꎬ Nanxi  basal leaves Paraboea species ( P. hekouensis Y. M.

   Townshipꎬ  Hekou   Countyꎬ   Yunnan   Provinceꎬ   Shui & W. H. Chen and P. manhaoensis Y. M. Shui &
   China. The Chinese name is “nán xī zhū máo Jù Tái”  W. H. Chen) in the same geographic regionꎬ but they
   (南溪蛛毛苣苔).                                         are very different from the new species. P. hekouensis
       Conservation status: Approximately only 50    has white flowers and golden ̄brown simple long
   individuals were found in two separate locations during  trichomes on the lower leaf surfaceꎬ petiolesꎬ peduncles
   filed investigation. Base on the result of field surveys  and pedicelsꎬ while P. manhaoensis has tiny white
   and   available  dataꎬ  Paraboea  nanxiensis  is  flowers and golden subsessile glands on lower leaf
   provisionally assessed as Critically Endangered ( CR)  surface on the veinsꎬ petiolesꎬ peduncles and filaments
   B2a according to IUCN Red List categories and     (Chen et al.ꎬ 2012) ( Fig. 2: Gꎬ H). At the same
   criteria (IUCNꎬ 2019)ꎬ and we will continue to pay  timeꎬ the type locality is in the Sino ̄Vietnamese

   attention on the dynamics of this plant species with  limestone region which is one of the biodiversity hotspots
   extremely small populations.                      in the worldꎬ many species of Gesneriaceae (including
       Additional specimens examined: Chinaꎬ Yunan   the genus Paraboea) were discovered in this area in
   Provinceꎬ Maguan  Countyꎬ Gulinqing  Communityꎬ   recent years ( Chen et al.ꎬ 2012ꎬ 2014ꎻ Cai et al.ꎬ
   Juziyuanꎬ  Zhankengdaokouꎬ  103° 54′ 09. 91″  Eꎬ  2017ꎬ 2019ꎻ Xu et al.ꎬ 2017aꎻ Middletonꎬ 2018ꎻ Chen
   22°43′41.92″ Nꎬ alt. 610 mꎬ on the surface of moist  et al.ꎬ 2019ꎻ Lu et al.ꎬ 2019ꎻ Averyanov et al.ꎬ 2020)ꎬ
   rocksꎬ 20 November 2017ꎬ L. Cai et al. CL2017092  thereforeꎬ we will continue to pay more attention to the
   (KUN!).                                           Gesneriaceae species diversity in this area and adjacent

       Notes:   Paraboea  nanxiensis  morphologically  region.
   resembles P. nutans in the obovate leaf blade with    Acknowledgements  We thank Mr. Guoyun Li of
   cobwebby ̄woolly and brownish woolly hairꎬ absent or  Maguan Gulinqing Provincial Nature Reserveꎬ Mr. Pin
   short petiole and purplish blueꎬ howeverꎬ P. nanxiensis  Zhangꎬ Mr. Yunmeng Li and Ms. Jiajun Yang of
   can be clearly distinguished from P. nutans by several
                                                     Kunming Institute of Botanyꎬ Chinese Academy of
   vegetative charactersꎬ e. g. the calyx lobes oblong to
                                                     Sciences during the field workꎬ and we are particularly
   oblanceolateꎬ glabrous (vs. oblong or lanceolate ̄oblongꎬ
                                                     grateful to Dr. Weibin Xu and Dr. Fang Wen of Guangxi
   outside sparsely brownish woolly )ꎻ corolla broadly
                                                     Institute of Botanyꎬ Guangxi Zhuang Autonomous
   shallow campanulate (vs. helmet shaped)ꎻ limb slightly
                                                     Region and Chinese Academy of Sciences for their
   2 ̄lipped ( vs. limb obviously 2 ̄lipped)ꎻ tube inside
                                                     assistance on species identification.
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