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.