RESUMO -O Jardim Botânico de Porto Alegre (JBPA) atua na conservação da flora nativa no Rio Grande do Sul e representa uma das principais áreas verdes da cidade. Através de coletas periódicas, foi realizado o levantamento florístico das plantas trepadeiras com ocorrência espontânea no JBPA. Para cada espécie, foram registrados os atributos hábito, mecanismo de escalada e síndrome de dispersão. São apresentadas chaves de identificação para as espécies baseadas em caracteres vegetativos. Foram registradas 81 espécies, sendo oito exóticas, pertencentes a 58 gêneros e 30 famílias. As três famílias mais ricas foram Apocynaceae, Asteraceae e Convolvulaceae com 11, nove e sete espécies, respectivamente. Há 42 trepadeiras herbáceas e 39 lenhosas, das quais o mecanismo de escalada mais frequente é o volúvel e a síndrome de dispersão a anemocoria. O atributo mecanismo de escalada mostra-se relacionado ao hábito, ao passo que a síndrome de dispersão não apresenta relação com o mesmo. Evidencia-se que o JBPA abriga 16% das espécies de trepadeiras nativas no estado, o que ressalta a importância dessa pequena área verde urbana para a conservação da flora.Palavras-chave: área verde urbana, conservação, lianas ABSTRACT -Climbing Plants in the Porto Alegre Botanical Garden, Rio Grande do Sul, Brazil: floristics and identification keys based on vegetative characters. The Porto Alegre Botanical Garden (JBPA) aims at the conservation of native flora in Rio Grande do Sul and represents one of the main green areas in the city. Through periodic collections, we made a floristic inventory of the naturally occurring climbers in JBPA. For each one of the species, the attributes growth form, climbing mechanism and dispersal syndrome were described. Identification keys for species based on vegetative characters are presented. We recorded 81 species, of which eight are exotic, belonging to 58 genera and 30 families. The three richest families were Apocynaceae, Asteraceae and Convolvulaceae with 11, nine and seven species, respectively. There are 42 herbaceous and 39 woody climbers, of which the most frequent climbing mechanism is the twiner and the dispersal syndrome is the anemochory. The climbing mechanism attribute is associated with growth form, while dispersal syndrome is not. This study highlights that the JBPA shelters 16% of the native climbers in the state, which emphasizes the importance of that small urban green area for the conservation of flora.
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