New Circumscription of the Endemic Brazilian Genus Actinocephalus (Eriocaulaceae)

作者：Costa Fabiane Nepomuceno^*; Sano Paulo Takeo

来源：Novon: A Journal for Botanical Nomenclature , 2013, 22(3): 281-287.

DOI：10.3417/2011001

• Actinocephalus
• Brazil
• Eriocaulaceae
• Paepalanthus

Based initially on the morphological similarity between species belonging to Actinocephalus (Korn.) Sano and Paepalanthus Mart. subsect. Aphorocaulon Ruhland (Eriocaulaceae), these taxa were studied to clarify their relationships. After intensive fieldwork and morphological analyses of specimens belonging to Paepalanthus subsect. Aphorocaulon and Actinocephalus, we conclude that Paepalanthus subsect. Aphorocaulon and Actinocephalus should not be classified as different taxa. This taxonomic opinion is confirmed by published phylogenetic morphological and molecular data. We propose herein to include species of Paepalanthus subsect. Aphorocaulon in Actinocephalus. Thus nomenclatural and taxonomic changes are proposed in Actinocephalus and Paepalanthus with the following 16 new combinations: A. actinocephaloides (Silveira) F. N. Costa P. actinocephaloides Silveira], A. arenicola (Silveira) F. N. Costa [equivalent to P. arenicola Silveira], A. armeria (Mart. ex Kern.) F. N. Costa [equivalent to P. armeria Mart. ex Korn.], A. bahiensis (Bong.) F. N. Costa P. bahiensis (Bong.) Kunth], A. barbiger (Silveira) F. N. Costa [equivalent to P. barbiger Silveira], A. geniculatus (Bong.) F. N. Costa [equivalent to P. geniculatus (Bong.) Kunth], A. glareosus (Bong.) F. N. Costa P. glareosus (Bong.) Kunth], A. heteropus (Silveira) F. N. Costa P. heteropus Silveira], A. incanus (Bong.) F. N. Costa P. incanus (Bong.) Korn], A. longifolius (Korn.) F. N. Costa P. longifolius Korn, A. perbracchiatus (Silveira) F. N. Costa [equivalent to P. perbracchiatus Silveira], A. phaeocephalus (Ruhland) F. N. Costa [equivalent to P. phaeocephalus Ruhland], A. rhizomatosus (Silveira) F. N. Costa P. rhizomatosus Silveira], A. scytophyllus (Ruhland) F. N. Costa P. scytophyllus Ruhland], A. trichopeplus (Silveira) F. N. Costa [equivalent to P. trichopeplus Silveira], and A. velutinus (Silveira) F. N. Costa [equivalent to P. velutinus Silveira]. In addition, nine new synonyms and lectotypifications for the six following names are presented: Paepalanthus subsect. Aphorocaulon Ruhland, Paepalanthus subsect. Aphorocaulon beta Incani Ruhland [unranked], Paepalanthus subsect. Aphorocaulon beta Condensati Ruhland [unranked], P. incanus (Bong.) Korn. var. alpha Korn., P. praemorsus Ruhland, and A. scytophyllus (Ruhland) F. N. Costa. As newly circumscribed, the genus Actinocephalus comprises 49 species restricted to Brazil, with the Espinhaco Range as the center of species diversity. Species of Actinocephalus can be distinguished principally by the presence of paraclades covered by bracts and rarely a single scape arranged in an umbelliforrn coflorescence at the apex.

• 出版日期2013-5