| Canada | | | Soreng, R. J., L. M. Giussani & M. A. Negritto | 2003 | Poa. | Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae, Contr. U.S. Natl. Herb. | 48: 505–580 |
| Canada | | | Soreng, R. J., G. Davidse, P. M. Peterson, F. O. Zuloaga, E. J. Judziewicz, T. S. Filgueiras & O. Morrone | 2003 and onwards | On-line taxonomic novelties and updates, distributional additions and corrections, and editorial changes since the four published volumes of the Catalogue of New World Grasses (Poaceae) published in Contr. U.S. Natl. Herb. vols. 39, 41, 46, and 48 | Internet Cat. New World Grasses | http://www.tropicos.org/Project/CNWG: |
| Canada | Northwest Territories | | Tzvelev, N. N. | 1976 | (none) | Zlaki SSSR | 1–788 |
| Greenland | | | Tzvelev, N. N. | 1976 | (none) | Zlaki SSSR | 1–788 |
| Greenland | | | Soreng, R. J., L. M. Giussani & M. A. Negritto | 2003 | Poa. | Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae, Contr. U.S. Natl. Herb. | 48: 505–580 |
| Greenland | | | Fredskild, B. | 1996 | A phytogeographical study of the vascular plants of West Greenland (62o20'-74o00'N) | BioScience | 45: 1–157 |
| Greenland | | | Böcher, T. W., K. Holmen & K. Jacobsen. | 1968 | (none) | Fl. Greenland (ed. 2) | 312 pp |
| Greenland | | | Holmen, K. | 1968 | (none) | Check-list Vasc. Pl. Greenland | 1–40 |
| Greenland | | | Soreng, R. J., G. Davidse, P. M. Peterson, F. O. Zuloaga, E. J. Judziewicz, T. S. Filgueiras & O. Morrone | 2003 and onwards | On-line taxonomic novelties and updates, distributional additions and corrections, and editorial changes since the four published volumes of the Catalogue of New World Grasses (Poaceae) published in Contr. U.S. Natl. Herb. vols. 39, 41, 46, and 48 | Internet Cat. New World Grasses | http://www.tropicos.org/Project/CNWG: |
| Russian Federation | | | Tzvelev, N. N. | 1976 | (none) | Zlaki SSSR | 1–788 |
| Svalbard | | | Edmondson, J. R. | 1980 | Poa | Fl. Eur. | 5: 159–1167 |
| Svalbard | | | Mossberg, B. & L. Stenberg | 2003 | (none) | Nord. Fl. | 1–928 |
| United States | | | Soreng, R. J., G. Davidse, P. M. Peterson, F. O. Zuloaga, E. J. Judziewicz, T. S. Filgueiras & O. Morrone | 2003 and onwards | On-line taxonomic novelties and updates, distributional additions and corrections, and editorial changes since the four published volumes of the Catalogue of New World Grasses (Poaceae) published in Contr. U.S. Natl. Herb. vols. 39, 41, 46, and 48 | Internet Cat. New World Grasses | http://www.tropicos.org/Project/CNWG: |
| United States | | | Soreng, R. J., L. M. Giussani & M. A. Negritto | 2003 | Poa. | Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae, Contr. U.S. Natl. Herb. | 48: 505–580 |
| United States | Alaska | | Soreng, R. J., L. M. Giussani & M. A. Negritto | 2003 | Poa. | Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae, Contr. U.S. Natl. Herb. | 48: 505–580 |
| United States | Alaska | | Soreng, R. J., G. Davidse, P. M. Peterson, F. O. Zuloaga, E. J. Judziewicz, T. S. Filgueiras & O. Morrone | 2003 and onwards | On-line taxonomic novelties and updates, distributional additions and corrections, and editorial changes since the four published volumes of the Catalogue of New World Grasses (Poaceae) published in Contr. U.S. Natl. Herb. vols. 39, 41, 46, and 48 | Internet Cat. New World Grasses | http://www.tropicos.org/Project/CNWG: |