| Argentina | | | Soreng, R. J., J. Valdés-Reyna & A. M. Cialdella | 2002 | Stipeae | Internet Cat. New World Grasses | ined. |
| Argentina | | | Barkworth, M.E. & A. M. Torres | 2001 | Distribution and diagnostic characters of Nassella (Poaceae: Stipeae) | Taxon | 50(2): 439–468 |
| Argentina | | | Soreng, R. J. | 2003 | Nassella. | Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae, Contr. U.S. Natl. Herb. | 48: 455–467 |
| Argentina | | | 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: |
| Australia | | | Sharp, D. & B. K. Simon | 2002 | AusGrass: Grasses of Australia. CD-ROM, Version 1.0 | | CD–ROM |
| Brazil | | | Soreng, R. J., J. Valdés-Reyna & A. M. Cialdella | 2002 | Stipeae | Internet Cat. New World Grasses | ined. |
| Brazil | | | Barkworth, M.E. & A. M. Torres | 2001 | Distribution and diagnostic characters of Nassella (Poaceae: Stipeae) | Taxon | 50(2): 439–468 |
| Brazil | | | Soreng, R. J. | 2003 | Nassella. | Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae, Contr. U.S. Natl. Herb. | 48: 455–467 |
| Brazil | | | 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: |
| Uruguay | | | 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: |
| Uruguay | | | Soreng, R. J., J. Valdés-Reyna & A. M. Cialdella | 2002 | Stipeae | Internet Cat. New World Grasses | ined. |
| Uruguay | | | Barkworth, M.E. & A. M. Torres | 2001 | Distribution and diagnostic characters of Nassella (Poaceae: Stipeae) | Taxon | 50(2): 439–468 |
| Uruguay | | | Soreng, R. J. | 2003 | Nassella. | Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae, Contr. U.S. Natl. Herb. | 48: 455–467 |