Molecular Phylogeny and Morphological Analysis of Tetraglochin (Rosaceae: Rosoideae: Sanguisorbeae) and Recognition of the New Species T. andina

ACOSTA, JUAN MANUEL; SALARIATO, DIEGO L.; CIALDELLA, ANA M.

SYSTEMATIC BOTANY

AMER SOC PLANT TAXONOMISTS

Lugar: Laramie; Año: 2016 vol. 41 p. 839 - 850

0363-6445

Abstract?The genus Tetraglochin belongs to the family Rosaceae, subfamilyRosoideae, tribe Sanguisorbeae, and is distributed along the Andes from Peru tosouthern Argentina and central Chile. In order to test its monophyly and analyzerelationships among species of this genus and allied genera, we conductedmorphological studies and phylogenetic analyses using both nuclear (ITS) and cpDNA(trnL-F) sequences. As a result, Tetraglochin is supported as monophyletic, with thegenus Margyricarpus as its sister group. Tetraglochin acanthocarpa and T. caespitosaresulted basal to the other species of the genus, which were grouped in two mainsubclades: one of them primarily distributed along the Central Andes and including T.cristata, T. inermis and specimens previously classified as T. ameghinoi, this subcladewith coriaceous or papery not translucent hypanthium, and the other subclade, mainlydistributed along the Southern Andes, and comprising T. alata and the remainingspecimens of T. ameghinoi, this subclade characterized by their membranoustranslucent hypanthium. Based on results obtained from morphological studies,molecular phylogenies, and species delimitation analyses, a new species T. andina, isproposed, segregated from T. ameghinoi. A key to identify all species hereinrecognized, and a map containing geographical distribution of them are provided,together with a description and illustration of the new species.