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Poa   secunda    J. Presl. s.l. is a morphologically highly variable bunchgrass that is a valuable forage species in western North America. There has been much controversy as to whether multiple taxa should be recognised and at what rank in this taxonomically challenging apomictic complex. Here we propose an infraspecific classification for    Poa   secunda    of six varieties within two subspecies,juncifolia    andsecunda  .  New combinations are    P.   secunda    vars.ampla   ,gracillima   ,juncifolia   ,nevadensis    andscabrella   . Conflicting plastid and  nrDNA  phylogenies show that   P.   sect.   Secundae   is of ancient hybrid origin. Based on this and its distinct morphology, the section is raised to the rank of subgenus. A key is presented for    P.   secunda    infraspecies and closely related non-arctic species. Suppl. materials are provided of chromosome counts for    Secundae    taxa and D.D. Keck specimen annotations of taxa here included in    P.   secunda   .

phytokeys

Poa   secunda    J. Presl (  Poaceae  ): a modern summary of infraspecific taxonomy, chromosome numbers, related species and infrageneric placement based on DNA