File:Interstate medical journal (1919) (14761757564).jpg

Identifier: interstatemedica2619unse (find matches)
Title: Interstate medical journal
Year: 1919 (1910s)
Authors:
Subjects: Medicine
Publisher: St. Louis, : Interstate Medical Journal
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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Fig. 7.—Common Ragweed. It is the cause of 90 percent of the fall hayfever eastof the 100th meridian, and is the principal cause of hayfever in the UnitedStates generally. Dandelion (Leontodon, Fig. 5). The familiar yellow flower ofthe dandelion is common both in the city and country. The broad-toothed jagged edge of the leaves bears some resemblance to theteeth of the lion, hence the name dandelion (dents de lion). Thereare about 20 varieties in North and South America. All are insect-pollinated and harmless, except on direct application. Childrenshould not apply the dandelion to the nostril, as it may develop alatent hayfever, which may result in sensitization to atmosphericpollens. 136 INTERSTATE MEDICAL JOURNAL Resin weed (Grindelia squarrosa, Fig. 6). This is blamed inWyoming and the adjoining states for the prevalence of hayfever.The pollen of the resinweed, however, like the flowers, is stickyand resin-like, as implied by the popular name (also called gum
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Fig-. 8.—Giant Ragweed. A typical hayfever weed, which replaces the commonragweed in moist localities from the gulf states to Quebec, and west toManitoba, Nebraska, Colorado, and New Mexico. plant and tarweed). As the pollen is not wind-borne and there-fore not in the air, it is not a cause of hayfever. The probability,therefore, is that the resinweed, on account of its prevalence andconspicuousness, was selected in the same manner as the golden Scheppegrell: Harmless Flotvers and Hay fever Weeds 137 rod, which has been so long held responsible for hayfever, whilethe real but insignificant hayfever weeds were unsuspected. PRINCIPAL HAYFEVER WEEDS. Common Ragweed (Ambrosia elatior, Fig. 7). This is the causeof 90 percent of the fall hayfever east of the 100th meridian, andis the principal cause of hayfever in the United States generally.

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