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Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Poaceae
Subfamily: Panicoideae
Genus: Alexfloydia
Species: A. repens
Binomial name
Alexfloydia repens

Alexfloydia is an Australian genus of perennial stoloniferous plants panic grass subfamily of the grass family.[1][2]

This genus is found only in Coastal Eastern New South Wales. There is one known species, Alexfloydia repens.[3] This genus was named in honour of the species discoverer, Australian botanist Alexander Floyd (1926-).[4][5]

Habitat and distribution[edit]

Alexfloydia repens is a spreading, mat-forming grass found on the margins of brackish and tidal waterways in areas flooded by unusually high tides (called "king tides").[6] The species forms a groundcover associated with the tree species Casuarina glauca and the Endangered Ecological Community Swamp Oak Floodplain Forest. Currently this grass is known only from a few locations in the Coffs Harbour region.


This species is listed as Endangered on the schedules of the NSW Threatened Species Act.[7]


Alexfloydia repens is the sole larval food plant for the endangered Black grass-dart butterfly (Ocybadistes knightorum) (Lambkin & Donaldson, 1994).[8]

See also[edit]


  1. ^ Watson L, Dallwitz MJ. (2008). "The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references". The Grass Genera of the World. Retrieved 2009-08-19. 
  2. ^ Simon, B.K. 1992. Studies in Australian grasses 6. Alexfloydia, Cliffordiochloa and Dallwatsonia, three new panicoid grass genera from Eastern Australia. Austrobaileya 3:669-681.
  3. ^ "Alexfloydia". The Grass Genera of the World. Archived from the original on 14 May 2008. Retrieved 2008-04-02. 
  4. ^ "Alexander G. Floyd (1926 - )". Australian National Herbarium. Retrieved 2008-04-02. 
  5. ^ Atlas of Living Australia, Alexfloydia B.K.Simon
  6. ^ Tidal Variations — The Influence of Position and Distance NOAA ocean service education
  7. ^ "Black grass-dart butterfly - endangered species listing". Department of Environment & Climate Change (NSW). Retrieved 2008-04-02. 
  8. ^ "Alexfloydia repens (a grass) - endangered species listing". Department of Environment & Climate Change (NSW). Retrieved 2008-04-02.