. The drug plants of Illinois . AMBROSIA ARTEMISIIFOLIA L. Common ragweed, hog-weed, bitter- weed. Compositae.—An herb 1 to 3 feet tall, more or less hairy throughout, annual; roots fibrous; stem erect, straight, much- branched; leaves alternate, divided and subdivided into numerous lobes, 2 to 4 inches long, white-hairy beneath; male flowers in small green heads crowded in numerous spikes 1 to 5 inches long; female flowers greenish, in small clusters in the axils of upper leaves. Leaves and tops collected while the plant is in flower; also the pollen. Extremely abundant in waste places throug
. The drug plants of Illinois . AMBROSIA ARTEMISIIFOLIA L. Common ragweed, hog-weed, bitter- weed. Compositae.—An herb 1 to 3 feet tall, more or less hairy throughout, annual; roots fibrous; stem erect, straight, much- branched; leaves alternate, divided and subdivided into numerous lobes, 2 to 4 inches long, white-hairy beneath; male flowers in small green heads crowded in numerous spikes 1 to 5 inches long; female flowers greenish, in small clusters in the axils of upper leaves. Leaves and tops collected while the plant is in flower; also the pollen. Extremely abundant in waste places throughout Illi- nois; occurs in nearly pure stands in grain fields after harvest; July through October. Contains a bitter principle and a volatile oil. Used principally as a topical astringent. [The pollen of this plant is the principal cause of hay fever in August and September. Pollen is collected and extracted; and the extract is used as a prophylactic and cure for hay fever.]
Size: 2078px × 2404px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, booksubjectbotany, booksubjectbotanymedical
