
1) Benweed 2) Butterweed 3) Ragweed 4) Tansy
Found on
https://www.crosswordclues.com/clue/ragwort

1) Benweed 2) Dangerous greenery 3) Dangerous vegetation 4) Dangerous plant 5) Dicey vegetation 6) Dicey plant 7) Dicey greenery 8) Dicey plant to eat 9) Dicey flora to eat 10) Dodgy plant to eat 11) Dodgy flora to eat 12) Flora with toxic properties 13) Hazardous vegetation 14) Hazardous plant 15) Hazardous greenery
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https://www.crosswordclues.com/clue/ragwort

• (n.) A name given to several species of the composite genus Senecio.
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http://thinkexist.com/dictionary/meaning/ragwort/

(Senecio) This is a large group of hardy and tender annuals and perennials that may have shrubby, herbaceous, or climbing growth. Senecios are found wild in almost every country, especially in southern Europe; others are found in South Africa, New Zealand, Australia, China, Japan, the United States and Mexico. They vary in size and shape, particula...
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http://www.encyclo.co.uk/local/10004
Rag'wort` (-wûrt`)
noun (Botany) A name given to several species of the composite genus
Senecio . »
Senecio aureus is the golden ragwort of the United States;
S. elegans is the purple ragwort of South Africa.
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http://www.encyclo.co.uk/webster/R/6

The ragwort (Senecio jacobaea) is a perennial or biennial plant of the family Compositae native to Europe and western Asia found on waste ground.
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http://www.probertencyclopaedia.com/browse/BR.HTM

[
n] - widespread European weed having yellow daisylike flowers
Found on
http://www.webdictionary.co.uk/definition.php?query=ragwort

A weed which is gaining in population due to it's being uncontrolled on roadside verges etc. It is poisonous to livestock when wilting and should be controlled.
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https://www.encyclo.co.uk/local/20496
ragweed 2 benweed noun widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
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https://www.encyclo.co.uk/local/20974

Any of several European perennial plants, usually with yellow flower heads; some are poisonous. (Genus
Senecio, family Compositae.)
Found on
https://www.encyclo.co.uk/local/21221
No exact match found.