SafePlants

Mitchell Grass (Astrebla spp.)

Astrebla is a genus of grasses commonly known as Mitchell grass, endemic to Australia. These xerophytic (desert-loving) grasses are a dominant feature of the Australian landscape.

Considerations for Pets

• This grass is palatable to livestock even when dry.
• Some fungi found on Astrebla grasses in north-western Australia have been identified as toxic.

Scientific Classification

• Genus: Astrebla F. Muell. ex Benth.
• Family: Poaceae
• Subfamily: Chloridoideae
• Tribe: Cynodonteae

Species

The Plant List recognizes 4 accepted species names within the genus Astrebla:

• Astrebla elymoides F. Muell. ex F.M. Bailey
• Astrebla lappacea (Lindl.) Domin
• Astrebla pectinata (Lindl.) F. Muell.
• Astrebla squarrosa C.E. Hubb.

Synonyms

For Astrebla lappacea:

• Danthonia triticoides
• Anthistiria imberbis
• Astrebla triticoides

Distribution and Habitat

Astrebla grasses are found exclusively in Australia, dominating many areas of the continent. They are particularly prevalent in the Mitchell grasslands.

Morphological Characteristics

Astrebla lappacea, or Curly Mitchell grass, is a perennial caespitose grass, meaning it grows in tufts or clumps. Key features include:

• Long-lived (up to 30 years)
• Warm-season perennial
• Palatable even when dry
• Culms (stems) that are erect or decumbent (leaning), ranging from 30-80 cm long
• Ligule (a projection at the junction of leaf and sheath) that appears as a fringe of hairs

Ecological Role

• Mitchell grasses are known for their tolerance to heavy grazing.

Interactions with Other Organisms

• Aristida latifolia and Astrebla pectinata have been observed to increase in standing biomass together in certain environments.

Further Information

• Astrebla Downs National Park: Located in Queensland, Australia, this park provides a habitat for these grasses and other native wildlife, such as the bilby.
• The Plant List: A comprehensive resource for plant names.
• Australian Government Department of Sustainability, Environment, Water, Population and Communities (DeSEWPC): A data provider for information on Australian flora.