Horseweed
StarAmbrosia trifida
Synonyms: Ambrosia trifida var. texana, Ambrosia trifida f. integrifolia, Ambrosia trifida var. aptera, Ambrosia trifida var. integrifolia, Ambrosia trifida var. heterophylla, Ambrosia trifida var. normalis, Ambrosia integrifolia, Ambrosia trifida var. polyploidea, Ambrosia aptera
Western Herbalism Properties
Traditional Uses
Cherokee herbalists employed giant ragweed as a multi-purpose remedy: crushed leaves were rubbed on insect stings and a leaf infusion was applied to hives, juice from wilted leaves was placed on infected toes as a disinfectant, leaf infusions were taken internally to reduce fever and treat pneumonia, and the plant was an ingredient in green corn ceremonial medicine (Hamel and Chiltoskey, 1975). Iroquois practitioners took a compound decoction of the plant for diarrhea accompanied by bleeding and incorporated it into blood medicines (Herrick, 1977). The Lakota employed the seeds medicinally for unspecified complaints (Rogers, 1980), and Meskwaki used the chewed root as a psychological aid said to drive away nighttime fear (Smith, 1928).
Gallery
Botanical Description
Ambrosia trifida is a robust annual herb of the daisy family commonly growing 1-4 m tall, occasionally to 6 m, with a deep taproot and stout, rough-hairy, much-branched stems. The opposite leaves are large, 10-25 cm long and wide, palmately three- to five-lobed (the lower sometimes simple), with serrate lobe margins and rough-scabrous surfaces; petioles are conspicuously winged. The plant is monoecious: small greenish, nodding male capitula 4-5 mm across are arranged in long, slender terminal racemes, while the female heads are clustered in the upper leaf axils below and contain a single ovule. Female involucres mature into hard, top-shaped fruits 6-12 mm long bearing several short spines around a prominent central beak. Native to floodplains, riverbanks, and disturbed bottomlands of central and eastern North America, the species has become widely naturalised. Flowering is from July to October, producing copious airborne pollen.
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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