Phylogeny and circumscription of Dasyphyllum (Asteraceae: Barnadesioideae) based on molecular data with the recognition of a new genus, Archidasyphyllum

Author(s)

Ferreira, Paola de Lima ^[1] ; Saavedra, Mariana Machado ^[2] ; Groppo, Milton ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Biol, Fac Filosofia Ciencias & Letras Ribeirao Preto, Ribeirao Preto, SP - Brazil

^[2] Univ Fed Rio de Janeiro, Dept Bot, Inst Biol, Rio De Janeiro, RJ - Brazil

• Document type: Journal article
• Source: PeerJ; v. 7, FEB 27 2019.
• Web of Science Citations: 0

Abstract

Dasyphyllum Kunth is the most diverse genus of the South American subfamily Barnadesioideae (Asteraceae), comprising 33 species that occur in tropical Andes, Atlantic Forest, Caatinga, Cerrado, and Chaco. Based on distribution, variation in anther apical appendages, and leaf venation pattern, it has traditionally been divided into two subgenera, namely, Archidasyphyllum and Dasyphyllum. Further, based on involucre size and capitula arrangement, two sections have been recognized within subgenus Dasyphyllum: Macrocephala and Microcephala (=Dasyphyllum). Here, we report a phylogenetic analysis performed to test the monophyly of Dasyphyllum and its infrageneric classification based on molecular data from three non-coding regions (trnL-trnF, psbA-trnH, and ITS), using a broad taxonomic sampling of Dasyphyllum and representatives of all nine genera of Barnadesioideae. Moreover, we used a phylogenetic framework to investigate the evolution of the morphological characters traditionally used to recognize its infrageneric groups. Our results show that neither Dasyphyllum nor its infrageneric classification are currently monophyletic. Based on phylogenetic, morphological, and biogeographical evidence, we propose a new circumscription for Dasyphyllum, elevating subgenus Archidasyphyllum to generic rank and doing away with the infrageneric classification. Ancestral states reconstruction shows that the ancestor of Dasyphyllum probably had acrodromous leaf venation, bifid anther apical appendages, involucres up to 18 mm in length, and capitula arranged in synflorescence. (AU)

• FAPESP's process: 11/10446-0 - Systematics and taxonomy of Rudgea Salisb. (Psychotrieae, Rubiaceae)
• Grantee: Milton Groppo Júnior
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/06260-2 - Integrative systematic studies in Neotropical families, with emphasis on Rutaceae, Asteraceae and Rubiaceae
• Grantee: Milton Groppo Júnior
• Support Opportunities: Regular Research Grants