ResumoLemnoideae são consideradas as menores Angiospermas, sendo Wolffia o gênero com o menor tamanho de fronde e flores. São plantas de difícil interpretação morfológica e os termos utilizados para descrição são, em parte, diferentes dos usados para outras plantas. AbstractLemnoideae are the smallest Angiosperms, Wolffia is the genus with smallest fronds and flowers. Morphological interpretations are difficult and terms used for description are slightly different from those used for other plants. A survey of Lemnoideae was carried out in Paraná between July 2013 and September 2014, the specimens collected were identified and prepared according to special herborization techniques and deposited at UPCB and UNOP herbaria. Six species were found: Landoltia punctata, Lemna minuta, Lemna valdiviana, Spirodela intermedia, Wolffia brasiliensis and Wolffiella oblonga. Typically found in lentic environments, sewage ditches and creeks of the river, in Paraná they have been collected in Tropical Rainforest, Araucaria Forest, semideciduous forest and cerrado remnants.
ResumoO trabalho apresenta o tratamento taxonômico das Monsteroideae (Araceae) nativas do Brasil encontradas no estado do Paraná, com uma chave de identificação, descrições e ilustrações das espécies. AbstractThe study presented in this paper is a taxonomic treatment with an identification key, descriptions and illustrations of Monsteroideae (Araceae) species, located in the Paraná state (Brazil). The specimens were collected from July 2013 to September 2014, identified and deposited at UPCB and UNOP. Sixty-One exsiccates distributed in the herbaria of the Paraná were analyzed, the study revealed that the species: H. rigidifolia, H. salicifolia, M. adansonii and M. praetermissa are native to Brazil, and the exotic E. pinnatum and M. delicious were found in disturbed areas of conservation units. They are represented in this study by illustrative photos for their recognition in the field. Furthermore, the native species M. adansonii is neotropical and distributed in several states of Brazil, while H. rigidifolia, H. salicifolia and M. praetermissa are endemic to Brazil and more restricted to the Atlantic Forest. The Paraná state is the southern limit of geographical distribution for H. salicifolia and M. praetermissa. In Paraná, all native species Monsteroideae are found exclusively in areas of Ombrophylous Dense Forest.
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