ABSTRACT Hedychium coronariumJ.Koenig is a rhizomatous herbaceous species native to Asia and invasive in most states of Brazil. We aimed to evaluate the influence of H. coronariumon terrestrial herbaceous communities and natural regeneration of woody plants in a remnant of Alluvial Araucaria Forest in Curitiba - PR. The communities were sampled considering two treatments: (EC) high coverage of H. coronarium(>60%); (BC) low coverage of H. coronarium(<30%). Two communities were recorded: i) herbaceous vascular species (including subshrubs) and ii) seedlings of woody species between 15-130 cm height. In EC H. coronariumhad an average cover of 78.06%, with only five native herbaceous species and 24 native woody species. The average cover of the invasive in BC was 6.29%, with 17 native herbaceous and 37 woody native species. The most representative native herbaceous was Christella dentata(Forssk.) Brownsey & Jermy, while among the woody species Myrcia selloi(Spreng.) N.Silveira stood out for its frequency and abundance. The abundance of woody plants in the EC was approximately four times less than in the BC, showing that the high density of H. coronariumnegatively influences native plant communities. The high cover of the invasive species results in a decrease in species richness and the number of individuals in the communities, both herbaceous and woody regeneration. coronariumJKoenig coronariumJ Koenig Brazil H PR treatments (EC coronarium>60% coronarium60 coronarium >60% 60 coronarium(>60%) (BC coronarium<30%. coronarium30 <30% . 30 coronarium(<30%) recorded i including subshrubs ii 15130 15 130 15-13 height 7806 78 06 78.06% 2 629 6 29 6.29% 1 3 dentataForssk. dentataForssk dentata Forssk. Forssk dentata(Forssk. Jermy selloiSpreng. selloiSpreng selloi Spreng. Spreng selloi(Spreng. NSilveira N Silveira coronarium>60 coronarium6 >60 coronarium(>60% coronarium<30% coronarium3 <30 coronarium(<30% 1513 13 15-1 780 7 0 78.06 62 6.29 dentata(Forssk selloi(Spreng coronarium>6 >6 coronarium(>60 coronarium<30 <3 coronarium(<30 151 15- 78.0 6.2 coronarium> > coronarium(>6 coronarium<3 < coronarium(<3 78. 6. coronarium(> coronarium< coronarium(< coronarium(

RESUMO A espécie herbácea rizomatosa Hedychium coronarium J.Koenig é de origem asiática e ocorre como invasora na maioria dos estados do Brasil. O objetivo do estudo foi avaliar a influência de H. coronarium sobre as comunidades de herbáceas terrícolas e de regeneração natural de lenhosas em um remanescente de Floresta Ombrófila Mista Aluvial em Curitiba - PR. As comunidades foram amostradas considerando-se dois tratamentos: (EC) elevada cobertura de H. coronarium(>60%); (BC) baixa cobertura de H. coronarium (<30%). Foram avaliadas duas comunidades: i) espécies herbáceas (incluindo subarbustivas) e ii) plântulas de espécies lenhosas entre 15 cm - 130 cm de altura. No EC, H. coronariumapresentou cobertura média de 78,06%, sendo registradas apenas cinco espécies herbáceas nativas e 24 lenhosas nativas. No BC, a cobertura média da invasora foi de 6,29%, com registro de 17 herbáceas nativas e 37 lenhosas nativas. A herbácea nativa mais representativa foi Christella dentata(Forssk.) Brownsey & Jermy, enquanto, dentre as lenhosas, destacou-se Myrcia selloi(Spreng.) N.Silveira por sua frequência e abundância. A abundância das lenhosas no EC foi aproximadamente quatro vezes menor que no BC, mostrando que a elevada densidade de H. coronariumexerce influência negativa nas comunidades vegetais nativas. A elevada cobertura da espécie invasora resulta na redução da riqueza de espécies e do número de indivíduos nas comunidades, tanto de herbáceas quanto da regeneração de lenhosas. JKoenig J Koenig Brasil H PR considerandose considerando se tratamentos (EC coronarium>60% coronarium60 >60% 60 coronarium(>60%) BC (BC <30%. 30 <30% . (<30%) i incluindo subarbustivas ii 1 13 altura 7806 78 06 78,06% 2 629 6 29 6,29% 3 dentataForssk. dentataForssk dentata Forssk. Forssk dentata(Forssk. Jermy enquanto destacouse destacou selloiSpreng. selloiSpreng selloi Spreng. Spreng selloi(Spreng. NSilveira N Silveira coronarium>60 coronarium6 >60 coronarium(>60% <30 (<30% 780 7 0 78,06 62 6,29 dentata(Forssk selloi(Spreng coronarium>6 >6 coronarium(>60 <3 (<30 78,0 6,2 coronarium> > coronarium(>6 < (<3 78, 6, coronarium(> (< coronarium( (

ABSTRACT Although the Araucaria Mixed Forest has long been recognized for their woods and ecosystem services, we still lack basic information on what tree species occur there. Habitat loss and overexploitation have led several tree species of this forest into an extinction process. Therefore, it is urgent to compile what are the tree species of this forest type, identify if these species are threatened and which were not assessed for their threat category. We aimed to answer: (1) How many tree species occur in the Araucaria Mixed Forest? 2) How many of these species are under a threat category? (3) Does the number of threatened species per state/province mirror the species richness of the state/province through the Araucaria Mixed Forest distribution? We found 1,213 tree species for the forest type. The states of São Paulo, Minas Gerais and Rio de Janeiro presented the highest species richness. The number of assessed species reflected the total number of species per state/province. Of the species listed, 5.3 % were classified as threatened and 72.8 % have not been assessed. We provided the most comprehensive tree species list to date for the Araucaria Mixed Forest and unveiled the conservation status of its tree flora.