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Minggu, 19 November 2017

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Panicum effusum, commonly known as hairy panic, is a grass native to inland Australia. It occurs in every mainland state, as well as New Guinea. In dry conditions, the fast-growing grass can become a tumbleweed.


Video Panicum effusum



Description

Hairy panic is a perennial grass that reaches 70 centimetres (28 in) high. The leaves have tubercle-based hairs and are up to 5-30 centimetres (2.0-11.8 in) long by 0.4-1 centimetre (0.16-0.39 in) wide. The seed spikes are typically 5-50 centimetres (2.0-19.7 in) long, with the spikelets 2-3 millimetres (0.079-0.118 in) long.


Maps Panicum effusum



Taxonomy

Prolific Scottish botanist Robert Brown described Panicum effusum in his 1810 work Prodromus Florae Novae Hollandiae et Insulae Van Diemen. It still bears its original name. Ferdinand von Mueller described Panicum convallium, which he recorded from the banks of the Torrens and Gawler Rivers, on the Murray River and along the Flinders Ranges, in 1855.

Common names include branched panic, hairy panic, effuse panic, native millet and poison panic.


Australian Town Inundated by Hairy Panic | Al Jazeera America
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Distribution and habitat

Found across Australia, particularly in the east and Papua New Guinea, hairy panic occurs on low- to medium-nutrient clay soils over shale or conglomerate. Its large range, abundance and stable population mean that hairy panic is classified as Least Concern on the IUCN Red List, and in fact may be becoming more abundant.

"Hairy panic" is found on the following ecoregions in Australia: Shrubland, grass downs, tropical savanna, desert, woodlands, lowland rainforest, tropical rainforests, montane grasslands, sub-alpine grassland, mangroves, xeric scrub and temperate rainforests.


Panicum effusum â€
src: upload.wikimedia.org


Ecology

Panicum effusum produces a dry, single-seeded, indehiscent fruit which is eaten by the stubble quail. The seeds are wind-borne, though can also be transported in mud on cars.

The flowering of this plant occurs during summer. the plant is highly drought tolerant, but is sensitive to frost.

Under extremely dry conditions, the fast-growing grass becomes a tumbleweed (that is designed to disperse seeds) and can become a nuisance in residential areas due to the accumulation of grass stalks. In February 2016, the town of Wangaratta, Victoria, was invaded by large numbers of tumbleweeds of the plant, which piled up to roof height in places. Some residents blamed the problem on a local farmer who had failed to upkeep his paddock.

Hairy panic uses C4 carbon fixation, giving it an advantage in conditions of drought and high temperature.


File:Panicum effusum flowerhead4 (8242373861).jpg - Wikimedia Commons
src: upload.wikimedia.org


Uses

Hairy panic is a component of pastures, though not usually abundant. It is of moderate nutritional value to livestock. Sheep consuming large quantities of hairy panic within 2-6 weeks of rain can suffer from photosensitivity and the fatal disease "yellow-bighead".


Panicum effusum var. effusum
src: saseedbank.com.au


See also

  • Kali tragus, a common species of tumbleweed in the United States

File:Panicum effusum plant3 (8242377973).jpg - Wikimedia Commons
src: upload.wikimedia.org


References


Panicum effusum var. effusum
src: saseedbank.com.au


External links

  • Data related to Panicum effusum at Wikispecies
  • Media related to Panicum effusum at Wikimedia Commons

Source of the article : Wikipedia

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