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Taxon: Nassella trichotoma (Nees) Hack. ex Arechav.

Genus: Nassella
Family: Poaceae (alt. Gramineae) subfamily: Pooideae tribe: Stipeae
Nomen number: 316386
Place of publication: Anales Mus. Nac. Montevideo 1:336. 1895
Comment: authorship and valid publication verified from original literature
Name verified on: 15-Apr-2004 by ARS Systematic Botanists. Last updated: 15-Apr-2004
No species priority site assigned.


A declared noxious weed by USDA-APHIS.
A declared aquatic or terrestrial noxious weed and/or noxious-weed seed in these U.S. states (see state noxious weed lists), with links to state information or web documents:
AL*°, AR*°, AZ*°, DE°, FL*°, GA°, HI(as Stipa trichotoma)*°, IL°, MA*, MD°, MI(as Nasella trichoma)*°, MO°, MS°, NC°, NE°, OH°, OK*°, OR°, SC°, TX*°, VA°, VT°, WV°, WY°.
ªAquatic. *Terrestrial. °In seed.
noxious weed information from Invaders Database System for northwestern U.S.

Common names:

  • nassella tussock   (Source: Noxweed Aust ) – English
  • serrated tussock   (Source: World Econ Pl ) – English
  • Yass River tussock   (Source: Noxweed Aust ) – English
  • nassella polgras   (Source: Weeds SAfr 2001 ) – Afrikaans
  • flechilha   (Source: D. Groth, p.c. 2005 [as Stipa trichotoma]) – Portuguese (Brazil)

Economic importance:

Distributional range:

    Brazil: Brazil - Rio Grande do Sul
    Southern South America: Argentina - Buenos Aires, Cordoba, Entre Rios, Federal District, La Pampa, Mendoza, San Luis, Santa Fe; Uruguay

      Naturalized: (links to other web resources are provided for some distributions)
    Macaronesia: Portugal - Madeira Islands
    Southern Africa: South Africa
    Australia: Australia
    New Zealand: New Zealand
    Europe [s.]
    United States
    North-Central Pacific: United States - Hawaii


  • Barkworth, M. E. 1990. Nassella (Gramineae, Stipeae): revised interpretation and nomenclatural changes. Taxon 39:612.
  • Germishuizen, G. & N. L. Meyer, eds. 2003. Plants of southern Africa: an annotated checklist. Strelitzia 14.
  • Groth, D. 2005. pers. comm. [re. Brazilian common names].
  • Henderson, L. 2001. Alien weeds and invasive plants: a complete guide to declared weeds and invaders in South Africa. Plant Protection Research Institute, Handbook 12.
  • Henderson, M. et al. 1987. Declared weeds and alien invader plants in South Africa. Botanical Research Institute, bulletin 413. [= Stipa trichotoma Nees].
  • Hnatiuk, R. J. 1990. Census of Australian vascular plants. Australian Flora and Fauna Series No. 11.
  • Holm, L. et al. 1979. A geographical atlas of world weeds.
  • Jacobs, S. W. L. & J. Everett. 1995. Austrostipa, a new genus, and new names for Australasian species formerly included in Stipa (Gramineae). Telopea 6:593.
  • Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia.
  • Press, J. R. & M. J. Short, eds. 1994. Flora of Madeira.
  • Seed Regulatory and Testing Division, Agricultural Marketing Service, U.S.D.A. State noxious-weed seed requirements recognized in the administration of the Federal Seed Act (updated annually).
  • Weber, E. 2003. Invasive plant species of the world: a reference guide to environmental weeds.
  • Zuloaga, F. O. et al. 1994. Catalogo de la familia Poaceae en la Republica Argentina. Monogr. Syst. Bot. Missouri Bot. Gard. 47. [= Stipa trichotoma Nees].


Check other web resources for Nassella trichotoma (Nees) Hack. ex Arechav.:


  • Disseminule drawings: U.S. National Seed Herbarium drawing
  • Embryo drawing: U.S. National Seed Herbarium drawing
  • Florets: U.S. National Seed Herbarium image
  • Florets: Seed ID Workshop image, from Department of Horticulture and Crop Science, Ohio State University
  • Check for additional images
  • Google Images Images Note: Be advised that their identity may be inaccurate. Proper identification of a plant may require specialized taxonomic knowledge or comparison with properly documented herbarium material.

Abbreviations & symbols in GRIN Taxonomy

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Cite as:
USDA, ARS, National Genetic Resources Program.
Germplasm Resources Information Network - (GRIN) [Online Database].
National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: (26 November 2015)

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