Four new species of Orchidaceae from China,Heminium lijiangense,Peristylus fasciculatus,Platanthera milinensis,and Ponerorchis gongshanensis,together with a new country record,Peristylus tenuicallus,are described and ...Four new species of Orchidaceae from China,Heminium lijiangense,Peristylus fasciculatus,Platanthera milinensis,and Ponerorchis gongshanensis,together with a new country record,Peristylus tenuicallus,are described and illustrated based on morphological and/or phylogenetic analyses.Heminium lijiangense is closely related to H.elisabethae but differs from it by having the dorsal sepal ovate-orbicular and lip midlobe distinctly shorter than lateral lobes.P.fasciculatus is close to Peristylus tradescantifolius but is distinguished from it by having several fascicled and straight,root-like tubers(vs.one or two oblongoid tubers),old stems usually persistent,middle lobe of lip narrowly ligulate-lanceolate and half as long as the lateral lobes(vs.middle lobe deltoid,about a third as long as the lateral lobes or less),a raised callus at the base of each lateral lobe(vs.callus absent),spur gradually attenuate toward the apex(vs.spur clavate).Platanthera milinensis is similar to P.stenochila by sharing small green flowers and lip without a spur,but differs in having a creeping rhizome,a corymbose inflorescence,and a broadly ovate and slightly 3-lobed lip.Ponerochis gongshanensis is similar to P.faberi in its small flowers,but differs in having a linear leaf c.3 mm wide(vs.leaf 5-13 mm wide),in the lip having collar-like raised margins on the sides of the spur entrance,and a mid-lobe which is notched at the apex but not divided into two divergent lobules that are nearly as large as the lateral lobes,as in P.faberi.All the proposed species obtained high support in phylogenetic analysis as new species.The recently described genus Apetalanthe is reduced to synonymy of Ponerorchis and a new combination is made.展开更多
报道了浙江产兰科Orchidaceae植物3个地理分布新记录,其中齿突羊耳蒜Liparis rostrata Rchb. f.属于华东分布新记录,乐东石豆兰Bulbophyllum ledungense T. Tang et F. T. Wang、密花石豆兰B. odoratissimum (J. E. Smith)Lindl.属于浙...报道了浙江产兰科Orchidaceae植物3个地理分布新记录,其中齿突羊耳蒜Liparis rostrata Rchb. f.属于华东分布新记录,乐东石豆兰Bulbophyllum ledungense T. Tang et F. T. Wang、密花石豆兰B. odoratissimum (J. E. Smith)Lindl.属于浙江分布新记录;描述了3个种的主要形态特征,指出了其与相近分类群的区别;确认了福建羊耳蒜Liparis dunnii Rolfe和伞花石豆兰Bulbophyllum shweliense W. W. Smith在浙江有分布的历史记录,分别是齿突羊耳蒜和乐东石豆兰的误定。比较研究了黄山舌唇兰Platanthera whangshanensis(S. S.Chien) Efimov与华南舌唇兰P. australis L. Wu, X. L. Yu, H. Z. Tian et J. L. Luo、筒距舌唇兰P. tipuloides (L. f.) Lindl.的形态特征,确认华南舌唇兰应作为黄山舌唇兰的异名;确认筒距舌唇兰在我国南方有分布的历史记录,系黄山舌唇兰之误定。凭证标本藏于浙江自然博物院(ZM)。展开更多
Aims Habitat connectivity is important in conservation since isolation can diminish the potential of a population for adaptation and increase its risk of extinction.However,conservation of naturally patchy ecosystems ...Aims Habitat connectivity is important in conservation since isolation can diminish the potential of a population for adaptation and increase its risk of extinction.However,conservation of naturally patchy ecosystems such as peatlands has mainly focused on preserving specific sites with exceptional characteristics,neglecting the poten-tial interconnectivity between patches.In order to better under-stand plant dynamics within a peatland network,we assessed the effect of population isolation on genetic distinctiveness,phenotypic variations and germination rates using the peatland-obligate white-fringed orchid(Platanthera blephariglottis).Methods Fifteen phenotypic traits were measured for 24 individuals per pop-ulation(20 distinct populations,Quebec,Canada)and germination rates of nearly 20000 seeds were assessed.Genetic distinctiveness was quantified for 26 populations using single nucleotide polymor-phism markers obtained via a pooled genotyping-by-sequencing approach.Geographic isolation was measured as the distance to the nearest population and as the number of populations occurring in concentric buffer zones(within a radius of 2,5 and 10 km)around the studied populations.Important Findings All phenotypic traits showed significant differences among popu-lations.Genetic results also indicated a pattern of isolation-by-distance,which suggests that seed and/or pollen exchange is restricted geographically.Finally,all phenotypic traits,as well as a reduced germination rate,were correlated with either geographic isolation or genetic distance.We conclude that geographic iso-lation likely restricts gene flow,which in turn may affect germi-nation.Consequently,it is imperative that conservation programs take into account the patchy nature of such ecosystems,rather than targeting a few specific sites with exceptional character for preservation.展开更多
基金Project of Orchid Biodiversity Survey of ChinaNational Forestry and Grassland Administration+2 种基金the National Natural Science Foundation of China(No.31670194)the Large-scale Scientific Facilities of theChinese Academy of Sciences(Grant No.2017-LSFGBOWS-02)the National Wild Plant Germplasm Resource Center。
文摘Four new species of Orchidaceae from China,Heminium lijiangense,Peristylus fasciculatus,Platanthera milinensis,and Ponerorchis gongshanensis,together with a new country record,Peristylus tenuicallus,are described and illustrated based on morphological and/or phylogenetic analyses.Heminium lijiangense is closely related to H.elisabethae but differs from it by having the dorsal sepal ovate-orbicular and lip midlobe distinctly shorter than lateral lobes.P.fasciculatus is close to Peristylus tradescantifolius but is distinguished from it by having several fascicled and straight,root-like tubers(vs.one or two oblongoid tubers),old stems usually persistent,middle lobe of lip narrowly ligulate-lanceolate and half as long as the lateral lobes(vs.middle lobe deltoid,about a third as long as the lateral lobes or less),a raised callus at the base of each lateral lobe(vs.callus absent),spur gradually attenuate toward the apex(vs.spur clavate).Platanthera milinensis is similar to P.stenochila by sharing small green flowers and lip without a spur,but differs in having a creeping rhizome,a corymbose inflorescence,and a broadly ovate and slightly 3-lobed lip.Ponerochis gongshanensis is similar to P.faberi in its small flowers,but differs in having a linear leaf c.3 mm wide(vs.leaf 5-13 mm wide),in the lip having collar-like raised margins on the sides of the spur entrance,and a mid-lobe which is notched at the apex but not divided into two divergent lobules that are nearly as large as the lateral lobes,as in P.faberi.All the proposed species obtained high support in phylogenetic analysis as new species.The recently described genus Apetalanthe is reduced to synonymy of Ponerorchis and a new combination is made.
文摘报道了浙江产兰科Orchidaceae植物3个地理分布新记录,其中齿突羊耳蒜Liparis rostrata Rchb. f.属于华东分布新记录,乐东石豆兰Bulbophyllum ledungense T. Tang et F. T. Wang、密花石豆兰B. odoratissimum (J. E. Smith)Lindl.属于浙江分布新记录;描述了3个种的主要形态特征,指出了其与相近分类群的区别;确认了福建羊耳蒜Liparis dunnii Rolfe和伞花石豆兰Bulbophyllum shweliense W. W. Smith在浙江有分布的历史记录,分别是齿突羊耳蒜和乐东石豆兰的误定。比较研究了黄山舌唇兰Platanthera whangshanensis(S. S.Chien) Efimov与华南舌唇兰P. australis L. Wu, X. L. Yu, H. Z. Tian et J. L. Luo、筒距舌唇兰P. tipuloides (L. f.) Lindl.的形态特征,确认华南舌唇兰应作为黄山舌唇兰的异名;确认筒距舌唇兰在我国南方有分布的历史记录,系黄山舌唇兰之误定。凭证标本藏于浙江自然博物院(ZM)。
基金This study was supported by NSERC:a Postgraduate Scholarship to L.D.V.(partnership with the Jardin botanique de Montréal),an Undergraduate Student Research Award to M.A.L.,a seed grant from the Quebec Centre for Biodiversity Science and a Discovery grant to S.P.(RGPIN-2014-05367)and M.P.(RGPIN-2014-05663).
文摘Aims Habitat connectivity is important in conservation since isolation can diminish the potential of a population for adaptation and increase its risk of extinction.However,conservation of naturally patchy ecosystems such as peatlands has mainly focused on preserving specific sites with exceptional characteristics,neglecting the poten-tial interconnectivity between patches.In order to better under-stand plant dynamics within a peatland network,we assessed the effect of population isolation on genetic distinctiveness,phenotypic variations and germination rates using the peatland-obligate white-fringed orchid(Platanthera blephariglottis).Methods Fifteen phenotypic traits were measured for 24 individuals per pop-ulation(20 distinct populations,Quebec,Canada)and germination rates of nearly 20000 seeds were assessed.Genetic distinctiveness was quantified for 26 populations using single nucleotide polymor-phism markers obtained via a pooled genotyping-by-sequencing approach.Geographic isolation was measured as the distance to the nearest population and as the number of populations occurring in concentric buffer zones(within a radius of 2,5 and 10 km)around the studied populations.Important Findings All phenotypic traits showed significant differences among popu-lations.Genetic results also indicated a pattern of isolation-by-distance,which suggests that seed and/or pollen exchange is restricted geographically.Finally,all phenotypic traits,as well as a reduced germination rate,were correlated with either geographic isolation or genetic distance.We conclude that geographic iso-lation likely restricts gene flow,which in turn may affect germi-nation.Consequently,it is imperative that conservation programs take into account the patchy nature of such ecosystems,rather than targeting a few specific sites with exceptional character for preservation.
