There are 17 species of Ragweed in North America. . Allergy to ragweed and related plants: Tansy ragwort may cause an allergic reaction in people who are allergic to the Asteraceae/Compositae plant family. Other Common Names: Common ragwort, mare's fart, tansy ragwort, ragweed, stinking willie, stinking nanny, dog standard, staggerwort, stammerwort, cankerwort, cushag, hierba de santiago (Spanish), herbe-de-saint-jacques, cinéraire (French), Jacobs-Greiskraut (German), eng-brandbæger (Danish), landøyda (Norwegian), stånds (Swedish). That’s why it's not unusual to see horses in fields chomping on grass but leaving the ragwort – clever things. We've travelled around a lot of the Southern half of the country and it is all over the place. Ragweed's female flowers are even easier to overlook than its male flowers, as they are hidden in the upper leaf axils—the angles between the upper side of a leaf or stem and the supporting stem or branch. Despite it being such a dangerous plant to both humans and livestock, I have never seen so much of it. The flowers are succeeded by fruits that are technically designated as "achene," a small, dry, single-seed fruit. Common ragweed’s flower spike looks much different from mugwort’s . . Ragwort is covered by the Weeds Act 1959 (which specifies five injurious weeds including common ragwort) and the Ragwort Control Act 2003. Ragwort is mildly poisonous, but the taste of the plant is usually off-putting to livestock. Common ragweed This close-up view of common ragweed shows both its staminate (male) flowers — at the upper right — and its pistillate (female) flowers — at the lower center: Botanical Name: Senecio jacobaea. Ragwort is the two poisonous while it somewhat is lifeless or alive, if the horse has been left in a pasture of rhododendron and ragwort it does no longer take long atall for the liver to start up failing, yet needless to say there is not any set time. As for allergens, Ragweed is second only to mold in causing allergic symptoms. We've travelled around a lot of the Southern half of the country and it is all over the place. Description: It is also called St. James's Wort, and Stagger-Wort, and Stammer-Wort, Segrum, and Ragweed. Ragwort is a serious risk to horses and cattle. The pollen that sits on brightly colored flowers is rarely responsible for hay fever because it is heavier and falls to the ground rather than becoming airborne. The common ragweed (Ambrosia artemisiifolia) can produce a million grains of pollen per plant daily, the Giant Ragweed (Ambrosia trifida) can create in excess of 1.25 million grains daily and over a billion during its life cycle. Ragwort is a potentially major problem this year. Weeds pollinate in the tardy summer and drop, with ragweed being the most volatile. Ragwort is a potentially major problem this year. 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