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In the United Kingdom, common ragwort (Senecio jacobaea) is one of the five plants named as an injurious weed under the provisions of the Weeds Act 1959. The word injurious in this context indicates that it could be harmful to agriculture, not that it is dangerous to animals, as all the other injurious weeds listed are non-toxic.
Packera aurea (formerly Senecio aureus), commonly known as golden ragwort or simply ragwort, is a perennial flower in the family Asteraceae.. It is also known as golden groundsel, squaw weed, life root, golden Senecio, uncum, uncum root, waw weed, false valerian, cough weed, female regulator, cocash weed, ragweed, staggerwort, and St. James wort.
Stinkwort – Various plants including Helleborus foetidus, the stinking hellebore; Dittrichia graveolens and Inula graveolens; and Datura stramonium, jimson weed. Stitchwort - Any of several plants of the genus Stellaria. Stichwort. St. James' Wort - Senecio jacobaea or Senecio aureus, two species of ragwort.
A ragwort plant can produce around 30,000 to 120,000 seeds but as this is a native plant in the UK these would on average only create one new plant. It can be toxic to livestock if it is contained in hay and it contains several kinds of Pyrrolizidine alkaloid which can, if the dose is high enough, cause liver damage .
Packera obovata, commonly known as roundleaf ragwort, [1] spoon-leaved ragwort, [2] or roundleaf groundsel [3] is an erect perennial herb in the Asteraceae (aster) family native to eastern North America. It was previously called Senecio obovatus. Basal and lower leaves are obovate with toothed margins, while upper leaves are pinnately divided.
Senecio ampullaceus — Texas ragwort, Texas squaw-weed, Texas groundsel, clasping-leaf groundsel [10] Senecio angulatus L.f. — creeping groundsel Senecio antisanae
It is variously known as the woodland ragwort, [1] heath groundsel, [2] or mountain common groundsel. [3] It is native to Eurasia, and it can be found in other places, including western and eastern sections of North America, as an introduced species and an occasional roadside weed. It grows best in cool, wet areas.
Senecio madagascariensis, also known as Madagascar ragwort, [3] is a species of the genus Senecio and family Asteraceae that is native to Southern Africa. Other common names include Madagascar groundsel and fireweed. [3] It has been included on the noxious weeds list for Hawaii [4] and the reject list for Australia. [5]