Gina Darin. Acroptilon repens, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild. Acroptilon repens (Linnaeus) de Candolle in A. P. de Candolle and ; Acroptilon picris (Pallas ex Willdenow) C. A. Meyer; C. picris Pallas ex Willdenow. Acroptilon repens. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences.

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Jepson Flora Project eds.

Rhaponticum repens – Bugwoodwiki

Russian knapweed spreads through creeping horizontal roots and seed. Russian knapweed is the most commonly used name in North America. Human intervention is needed to introduce the nematode to a new site.

Browse related by Tag horticultureinvasive speciesinvasiveweedbiodiversitymastergardenerinvasive plantterrestrial invasive species arcoptilon, terrestrial invasive plantinvasive herbaceous plantinvasive species articleinvasive species profile. It was accidentally introduced into North America as a contaminant of seed and spread rapidly. Citation for the whole project: Young stems are covered with woolly hairs, which rub off in acroptilln, giving older stems a dark-brown appearance.


This plant is listed by the U. Cypselae ivory to grayish or brown, mm; pappus bristles white, mm.

A combination of methods is always more successful for a difficult weed. Contaminated crop seeds are likely to be responsible for its spread worldwide Groh, ; Watson, acroptipon Maddox et al. If an infestation is too large to be treated mechanically, herbicides can be applied for effective control.

All shoot development originates from root-borne stem buds. Spermatophyta — Seed plants. Creeping roots usually dark brown or black, with scaly adventitious buds. Male Aceria acroptiloni mites do arcoptilon differ morphologically between generations Kovalev et relens. More photos of Acroptilon repens in CalPhotos. Accidental introductions of R.

It typically invades disturbed areas, forming dense singlespecies stands. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

Ash Meadows Gumplant Grindelia fraxino-pratensis. To alleviate the effect of residual plant chemicals, remove or plough the treated R.

Sod-forming perennials such as r thickspike wheatgrasses compete better than bunch grasses Benz et al.

Acroptilon repens, Russian Knapweed

Caroptilon involucre is slenderly ovoid, pale, and about 1 cm high. Also, Russian knapweed is a strong competitor in disturbed soils and burning may only lead to a larger infestation.


It is a relatively non-selective compound and is used to control broad-leaved weeds and grasses. Please consider upgrading your browser to the latest version or installing a new browser. US Fish and Wildlife Service, pp.

In North America, A. Liguliflorous heads comprise only ligulate flowers. Monitoring should be conducted during the spring, summer, and fall of each year. Flowering late spring-summer May-Sep. Vegetative propagation via reprouting from root fragments is also responsible for the spread of this species.

Taxonomic Tree Top repend page Domain: It is more competitive under drier conditions, but occurs in irrigated land.

Rhaponticum repens (Russian knapweed)

Acroptilon repens contains an allelopathic polyacetylene compound which inhibits the growth of competing plants. IPM Practitioner, 21 7: Picloram does not bind to soil and may leach acroptioon groundwater. Ecological Site Information System. Wyoming Centaurea repens Russian knapweed Noxious weed.

Login eFloras Home Help. Impacts of noxious weeds on ecologic and economic systems.