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.