Decumbent, tufted annual, grass-like or herb, 0.02-1 m high. Fl. green, Nov to Dec or Jan to Jun. Sand, clay, alluvium, sandstone.
Beard’s Provinces: Eremaean Province, Northern Province, South-West Province.
IBRA Regions: Avon Wheatbelt, Carnarvon, Central Kimberley, Dampierland, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Murchison, Northern Kimberley, Ord Victoria Plain, Pilbara, Swan Coastal Plain, Victoria Bonaparte, Warren.
IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Cape Range, Dandaragan Plateau, Eastern Murchison, Fitzgerald, Fitzroy Trough, Geraldton Hills, Hamersley, Hart, Mitchell, Northern Jarrah Forest, Pentecost, Perth, Pindanland, Roebourne, South Kimberley Interzone, Southern Jarrah Forest, Victoria Bonaparte P1, Warren.
IMCRA Regions: Canning, Pilbara (offshore), Shoalwater Coast, WA South Coast.
Local Government Areas (LGAs): Albany, Ashburton, Augusta Margaret River, Boddington, Broome, Busselton, Cunderdin, Dandaragan, Derby/west Kimberley, East Pilbara, Gingin, Halls Creek, Jerramungup, Kalamunda, Karratha, Katanning, Leonora, Mingenew, Narrogin, Nedlands, Northampton, Perth, Port Hedland, South Perth, Swan, Toodyay, Waroona, Wyndham-East Kimberley.
Alternative Names. Henry's crabgrass, southern crabgrass.
General Biology. Growth form. Grass. Life form. Annual, caespitose. Reproduction. Seed. Dispersal. Mowing, movement of seed in hay. Photosynthetic Pathway. C4. Seedbank persistence. Short, several months.
Notes. Can flower and set seed repeatedly throughout the growing season. Seed can germinate over a wide pH range (between 5 and 10). Seedling emergence is greatest for seeds on the soil surface. Seeds are short-lived and do not form a large, persistent seed bank, even when buried. Adapted to heavy grazing and germination can increase after seed is consumed by cattle. Germination occurs at temperatures above 20°C, and is greatest under fluctuating temperatures between 20 and 35°C. The primary dispersal mechanism of seed over larger distances is human activity. Light is critical for seed germination and mass germination can occur with isolated rainfall if temperatures are high enough.
Additional information. Origin. Tropical Asia. History of use/introduction. Animal fodder. Similar exotic species. Digitaria sanguinalis.
Suggested method of management and control. Spray 0.5% glyphosate in spring/summer or Verdict 520® 2 ml/10 L (250 ml/ha) + wetting agent. Read the manufacturers' labels and material safety data sheets before using herbicides. For further information consult the Australian Pesticides and Veterinary Medicines Authority to determine the status of permits for your situation or state.
Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/