Poa subg. Secundae (V.L. Marsh ex Soreng) Soreng & L.J. Gillespie, comb. et stat nov.

Soreng, Robert John & Gillespie, Lynn J., 2018, Poa secunda J. Presl (Poaceae): a modern summary of infraspecific taxonomy, chromosome numbers, related species and infrageneric placement based on DNA, PhytoKeys 110, pp. 101-121 : 110

Poa subg. Secundae (V.L. Marsh ex Soreng) Soreng & L.J. Gillespie, comb. et stat nov.

Basionym.

Poa sect. Secundae V.L. Marsh ex Soreng, Syst. Bot. 16(3): 511, 523. 1991a.

Type species.

Poa secunda J. Presl.

Species included.

Poa ammophila , P. curtifolia , P. hartzii , P. napensis , P. secunda , P. stenantha (including P. macroclada ?), P. tenerrima , P. unilateralis .

Notes.

The section Secundae was originally suggested to belong to P. subg. Poa ( Soreng 1991a), but, in subdividing the genus into more subgenera based on our plastid phylogeny ( Gillespie et al. 2007), the section was moved to subg. Stenopoa (Dumort.) Soreng & L.J. Gillespie. We subsequently discovered that the set of plastid Secundae genotypes resolved in a clade with three European diploid species with Nn genotypes, but the nrDNA genotypes of Secundae were like those of subg. Stenopoa (Ss) ( Cabi et al. 2017, Soreng et al. 2017 and results presented above). The apparently ancient reticulate origin of the group, along with its odd morphology within Poa , now leads us to raise the section to the rank of subgenus.