J. J.  Spies, H. Plessis, D., and Barker, N. P., ?Spies (1990)?, Genome, vol. 33, pp. 646-658, 1990.

H. P.  Linder, Verboom, G. A., and Barker, N. P., ?Phylogeny and evolution in the Crinipes group of grasses (Arundinoideae: Poaceae)?, Kew Bulletin, vol. 52, pp. 91-110, 1997.

H. P.  Linder, Baeza, C. M., Barker, N. P., Galley, C. A., Humphreys, A. M., Lloyd, K. M., Orlovich, D. A., Pirie, M. D., Simon, B. K., Walsh, N. G., and Verboom, G. A., ?A classification of the Danthonioideae (Poaceae)?, Annals of the Missouri Botanical Garden, 2009.

H. P.  Linder and Barker, N. P., ?Biogoegraphy of the Danthonieae?, in Monocot II Abstracts, K.  Wilson, Ed. Sydney: RBG, 1998, p. 36.

H. P.  Linder and Barker, N. P., ?Biogeography of the Danthonieae?, in Grass Systematics and Evolution Vol 2 of Proceedings of Monocots 2 Sept 1998, S. W. L.  Jacobs and Everett, J., Eds. Melbourne: CSIRO, 2000.

H. P.  Linder and Barker, N. P., ?From Nees to Now -Changing Questions in the Sytematics of the Grass Subfamily Danthonioideae?, Nova Acta Leopoldina NF, vol. 92, pp. 29-44, 2005.

C.  Hsiao, Jacobs, S. W. L., Barker, N. P., and Chatterton, N. J., ?A molecular phylogeny of the subfamily Arundinoideae (Poaceae) based on sequences of rDNA?, Australian Systematic Botany, vol. 11, pp. 41-52, 1998.

G. E. Gibbs Russell, Watson, L., Koekemoer, M., Smook, L., Barker, N. P., Anderson, H. M., and Dallwitz, M., Grasses of southern Africa. Memoirs of the Botanical Survey of South Africa 58, 1990.

R.  Cerros, Columbus, J. T., and Barker, N. P., ?Cerros (2008)?, in 4th International Conference: The Comparative Biology of the Monocotyledons: 5th International Symposium: Grass Systematics and Evolution, Copenhagen: Monocots IV, Copenhagen, 2008, p. 15.

N. P.  Barker, ?A systematic study of Pseudopentameris (Arundinoideae, Poaceae).?, Bothalia, vol. 25, pp. 141-148, 1995.

N. P.  Barker, ?The relationships of Amphipogon, Elytrophorus and Cyperochloa (Poaceae) as suggested by rbcL sequence data?, Telopea, vol. 7, pp. 205-213, 1997.

N. P.  Barker, ?Sequences of the grass-specific insert in the chloroplast rpoC2 gene elucidate generic relationships of the Arundinoideae (Poaceae)?, Systematic Botany, vol. 23, pp. 327-350, 1999.

N. P.  Barker, Clark, L. G., Davis, J. I., Duvall, M. R., Guala, G. F., Hsiao, C., Kellogg, E. A., H. Linder, P., Mason-Gamer, R. J., Matthews, S., Soreng, R. J., and Spangler, R., ?A Phylogeny of the Grass Family (Poaceae), as inferred from eight character sets?, in Grasses, Systematics and Evolution, S. W. L.  Jacobs and Everett, J., Eds. Collingwood: CSIRO Publishing, 2000, pp. 3-7.

N. P.  Barker and Fish, L., ?Rare and infrequent southern African grasses; assessing their conservation status and understanding their biology?, Biodiversity and Conservation, vol. 16, pp. 4051-4079, 2007.

N. P.  Barker, Galley, C. A., and Verboom, G. A., ?The phylogeny of the austral grass subfamily Danthonioideae: Evidence from multiple data sets.?, Plant Systematics and Evolution, 2009.

N. P.  Barker and H. Linder, P., ?Polyphyly of Arundinoideae (Poaceae): Evidence from rbcL Sequence Data?, Systematic Botany, vol. 20, pp. 423-435, 1995.

N. P.  Barker, H. Linder, P., and Morton, C., ?The Danthonieae: Composition and Relationships?, in Monocots II Abstracts, 1stst ed., K.  Wilson, Ed. Sydney: RBG, 1998, p. 6.

N. P.  Barker, Morton, C., and H. Linder, P., ?The relationships of Cortaderia (Poaceaeae): Molecules and Morphology?, in Monocots II Abstracts, K.  Wilson, Ed. Sydney: RBG, 1998, p. 6.

N. P.  Barker, Morton, C. M., and H. Linder, P., ?The Danthonieae: Genomic composition and relationships?, in Grasses, Systematics and Evolution, S. W. L.  Jacobs and Everett, J., Eds. Collingwood: CSIRO Publishing, 2000, pp. 221-230.

N. P.  Barker, ?The shape and ultrastructure of the caryopsis of Pentameris and Pseudopentameris species (Arundinoideae, Poaceae)?, Bothalia, vol. 16, pp. 65-69, 1986.

N. P.  Barker, ?A systematic study of Pentameris Beauv.?, Bothalia, vol. 23, pp. 25-47, 1993.

N. P.  Barker, ?External fruit morphology of southern African Arundineae (Arundinoideae: Poaceae).?, Bothalia, vol. 24, pp. 55-66, 1994.