Weed Identification

Australia > > Kochia

Kochia

Bassia scoparia

IMPORTANT: IF YOU SUSPECT THE PRESENCE OF THIS PLANT, PLEASE REPORT IT BY CALLING 1800 084 881 (local call cost anywhere in Australia)
or
REPORT IT ONLINE.


Alternative Name(s): Kochia scoparia

Family: Chenopodiaceae.

Form: Herb

Origin: Native of Europe and Asia.

Flowers/Seedhead: Inconspicuous, 2.3–3 mm wide, green, in groups of 2 to 6 in leaf-like bracts, amongst tufts of hairs longer than the flowers. Flowers summer.

Description: Erect annual herb to 1.8 m high. Leaves lanceolate, 2–12 cm long, 0.5–12 mm wide with 1–5 conspicuous veins; margins entire, fringed with hairs. Fruit star-shaped containing a single seed. Seeds oval, 1–2 mm long, brown or black.

Distinguishing features: Distinguished by simple to much-branched stems that are often shortly hairy but may be hairless, often red with age; leaves alternate, narrow-lanceolate with upper surface hairless, lower surface usually with dense covering of appressed hairs; flowers on short dense spikes in axils of upper branches or at ends of branches; base of flower surrounded by 5-lobed calyx with horizontal wings that persist around globeshaped fruit.

Dispersal: Spread by seed, particularly by tumbling dead plants.


Habit, Cranbrook, WA, April
photos WA Dept of Agric, J. Dodd

Notes: Introduced to salt affected areas in WA in 1990/91 but spread rapidly to non salt affected areas and roadsides and was considered a threat to cropping. An eradication program began in 1992. Hardy salt tolerant species adapted to arid areas. Useful fodder but contains nitrates. If the plant contains more than 1.5% by dry matter of nitrate it may be toxic. Is an allelopath, i.e. produces substances that suppress plant growth.

References:

    Weeds of Canada and the northern United States. F. Royer and R. Dickinson, 1999, pages 158–159.

Web References: Search Australian web sites for further information on this weed.


Kochia in wind-blown lines
Gairdner Range, WA.

Seeds

Roadside
Cranbrook, WA, April.

Seedling

Flowers & hairy leaves
Taft, California.

This weed has been included in the WEEDeck field guide as card H22

More information about WEEDeck is available from Sainty & Associates Pty. Ltd.

 

Australia > > Kochia

SITE MAP

Site Map

National Weeds Strategy | Weed Identification | State and Territory Contacts | About Weeds Australia
Australian Weeds Committee | Target Species for Biological Control | Training and Materials
Web Addresses | Feedback | Weeds of National Significance | Noxious Weeds List
Glossary of Acronyms | National Weeds Management Facilitator

National Weeds Strategy
Telephone: (03) 6344 9657
Fax: (03) 6343 1877
Email: jthorp@weeds.org.au

Privacy Statement

Legal Notice

Site Design - Computer Support Tasmania
© Australian Weeds Committee
National Weeds Strategy State and Territory Contacts Australian Weeds Committee Web Addresses and Other Stuff Weeds of National Significance Glossary of Acronyms Weed Identification & Information About Weeds Australia Target Species for Biological Control Training and Materials Feedback Noxious Weeds List Search Weeds Australia National Weeds Management Facilitator Home