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The Arctic ecozone is undergoing a rapid transformation in response to climate change. Establishing a baseline of current Arctic biodiversity is necessary to be able to track changes in species diversity and distribution over time. Here, we report a vascular plant floristic study of Katannilik Territorial Park, Kimmirut and vicinity within Circumpolar Arctic Bioclimate Subzone D on southern Baffin Island, Nunavut, Canada. We compiled a dataset of 1596 collections gathered in the study area throughout the last century, including 838 we made in 2012. The vascular flora comprises 35 families, 98 genera, 211 species, two nothospecies and seven infraspecific taxa. We newly recorded 51 taxa in 22 families in the study area: , (Asteraceae), , , (Brassicaceae), (Campanulaceae), , Honckenyapeploidessubsp.diffusa, , Sileneuralensissubsp.uralensis, (Caryophyllaceae), Carexbrunnescenssubsp.brunnescens, , , , , Eriophorumscheuchzerisubsp.arcticum (Cyperaceae), , Orthiliasecundasubsp.obtusata (Ericaceae), (Fabaceae), (Juncaceae), (Juncaginaceae), (Lentibulariaceae), (Lycopodiaceae), (Montiaceae), , Platantheraobtusatasubsp.obtusata (Orchidaceae), , , (Plantaginaceae), Calamagrostisneglectasubsp.groenlandica, , Festucaproliferavar.lasiolepis, F.rubrasubsp.rubra, F.rubrasubsp.arctica, Hordeumjubatumsubsp.jubatum, Leymusmollissubsp.mollis, L.mollissubsp.villosissimus, (Poaceae), (Primulaceae), (Pteridaceae), Coptidium×spitsbergense (Ranunculaceae), , P.hyparcticasubsp.hyparctica, , (Rosaceae), (Salicaceae), , , (Saxifragaceae) and (Woodsiaceae). We recorded 196 taxa in Katannilik Territorial Park (191 species, three infraspecific taxa and two nothospecies); 145 of these taxa are first records for the park. We recorded 170 taxa in Kimmirut and vicinity (166 species, three infraspecific taxa and one nothospecies) in Kimmirut and vicinity; 15 of these taxa are first records for Kimmirut and vicinity. All study area species are native, except two grasses that grew in Kimmirut: F.rubrasubsp.rubra, which may have been seeded and Hordeumjubatumsubsp.jubatum, of unknown origin. We summarize the distribution on Baffin Island for each taxon recorded in the study area, including several unpublished southern Baffin Island records.

北极生态区正在因气候变化而经历快速转变。建立当前北极生物多样性的基线对于追踪物种多样性和分布随时间的变化是必要的。在此，我们报告了对加拿大努纳武特地区巴芬岛南部环北极生物气候亚区D内的卡坦尼尔克领土公园、金米鲁特及其周边地区的维管植物区系研究。我们汇编了一个数据集，其中包含上世纪在研究区域收集的1596份标本，包括我们在2012年采集的838份。维管植物区系包括35科、98属、211种、2个杂种和7个种下分类群。我们在研究区域的22个科中新增记录了51个分类群：，（菊科），，，（十字花科），（桔梗科），，洪氏补血草疏花亚种，，乌拉尔蝇子草乌拉尔亚种，（石竹科），灰褐苔草灰褐亚种，，，，，北极羊胡子草北极亚种（莎草科），

，钝叶单侧花钝叶亚种（杜鹃花科），（豆科），（灯心草科）, （水麦冬科），（狸藻科），（石松科），（粟米草科），，钝萼斑叶兰钝萼亚种（兰科），，，（车前科），疏花拂子茅格陵兰亚种，，多蘖羊茅糙鳞变种，紫羊茅紫羊茅亚种，紫羊茅北极亚种，野大麦野大麦亚种，软稃羊茅软稃亚种，软稃羊茅长柔毛亚种，（禾本科），（报春花科），（蕨科），斯匹次卑尔根黄连杂种（毛茛科），，北极早熟禾北极亚种，，（蔷薇科），（杨柳科），，，（虎耳草科）和（岩蕨科）。我们在卡坦尼尔克领土公园记录了196个分类群（191种、3个种下分类群和2个杂种）；其中145个分类群是该公园的首次记录。我们在金米鲁特及其周边地区记录了170个分类群（166种、3个种下分类群和1个杂种）；其中15个分类群是金米鲁特及其周边地区的首次记录。除了在金米鲁特生长的两种草外，研究区域内的所有物种都是本地物种：可能是人工播种的紫羊茅紫羊茅亚种和来源不明的野大麦野大麦亚种。我们总结了研究区域内记录的每个分类群在巴芬岛的分布情况，包括一些未发表的巴芬岛南部记录。