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Based on a molecular DNA phylogeny of three plastid ( rpl32-trnK ,  rps16  intron, and  rps16-trnK ) and nuclear  ITS  regions investigating 32 species of   Agrostidinae  , we describe two new genera,    Agrostula    gen. nov.  with a single species and    Alpagrostis    gen. nov.  with four species; provide support for five species in a monophyletic    Podagrostis   ; and include a small sample of 12 species of a monophyletic    Agrostis    s.s. (including the type and most species of    Neoschischkinia   ), that separates into two clades corresponding to   A.   subg.   Agrostis   and   A.   subg.   Vilfa  .    Agrostula    differs from    Agrostis    in having leaf blades with pillars of sclerenchyma which are continuous between the adaxial and abaxial surface of the blades, dorsally rounded glumes with blunt to truncate and erose to denticulate apices, florets ½ the length of the glumes, lemmas equally wide as long, widest at (or near) apex, apices broadly truncate, irregularly 5 to 7 denticulate to erose, awnless, anthers longer than the lemmas, and rugose-papillose caryopses.    Alpagrostis    differs from    Agrostis    in having geniculate basally inserted awns and truncate lemma apices with lateral veins prolonged from the apex in (2)4 setae. The following eight new combinations are made:    Agrostula   truncatula   ,   Agrostula   truncatula   subsp.   durieui  ,    Alpagrostis   alpina   ,   Alpagrostis   alpina   var.   flavescens  ,    Alpagrostis   barceloi   ,    Alpagrostis   setacea   ,   Alpagrostis   setacea   var.   flava  , and    Alpagrostis   schleicheri   . In addition, we provide a key separating    Agrostula    and    Alpagrostis    from    Agrostis    s.s. and other genera previously considered as synonyms of    Agrostis   ; lectotypify    Agrostis   alpina    Scop.,    A.   schleicheri    Jord. &amp; Verl.,    A.   truncatula    Parl., and   A.   truncatula   var.   durieui   Henriq.; and neotypify    A.   setacea    Curtis.

phytokeys

A phylogeny of species near    Agrostis    supporting the recognition of two new genera,    Agrostula    and    Alpagrostis    (  Poaceae  ,   Pooideae  ,   Agrostidinae  ) from Europe