File:Interstate medical journal (1919) (14761760704).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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Fig1. 9.—Sagebrush. This belongs to the wormwood family, which replaces theragweed as the most common hayfever weed in the Rocky Mountain andPacific states. The plant has all the characteristics of the hayfever weeds, beingextremely common, with insignificant flowers (inflorescence) andwithout odor. The pollen is very irritating to hayfever nostrils,is generated in enormous quantities, and is so light that it will travelseveral miles through the air in a brisk wind (15 to 20 miles perhour). Giant Ragweed (Ambrosia trifida, Fig. 8). This is also a typical 138 INTERSTATE MEDICAL JOURNAL hayfever weed, which replaces the common ragweed in moist locali-ties from the gulf states to Quebec and west to Manitoba, Nebraska,Colorado, and New Mexico. It is called horseweed, bloodweed,and wild hemp. The plant bears no resemblance to the commonragweed, but the pollen, in its hayfever reaction7 and under themicroscope, is identical, except in size, which is about twice that
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Fig. 10.—Goosefoot. It has a wide geographical distribution, but its hayfeverreaction is much less marked than that of the ragweed or wormwoods. of the common ragweed. It is the principal hayfever weed in NewOrleans and its vicinity. Sagebrush (Artemisia triclentata, Fig. 9). This belongs to thewormwood family (Artemisia), which replaces the ragweed as themost common hayfever weeds in the Rocky Mountain and Pacificstates.8 While there are about 50 species found in these states. 7Classification of Hayfever Pollens from a Biological Standpoint. Wm. Scheppe-grell (Boston Med. and Surg. Jour., July 12, 1917). sHayfever—Its Cause and Prevention in the Rocky Mountain and Pacific States.Wm. Scheppegrell (U. S. Public Health Reports, July 27, 1917). Scheppegrell: Harmless Flowers and Hay fever Weeds 139 there are a few species, such as the California mugwort and thesagebrush, which grow in great abundance in the neighborhoodof towns and in agricultural districts, where they constitute ase

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