The drug plants of Illinois drugplantsofilli44teho Year: 1951 62 ILLINOIS NATURAL HISTORY SURVEY Circular 44 GRINDELIA SQUARROSA (Pursh) Dunal. Gum-plant, tar-weed, gum weed, rosin-weed. Compositae.—An erect, branched, gummy, smooth, var- nished-looking herb 8 to 24 inches tall, biennial or perennial; stems often reddish; leaves spatulate or oblong, sessile, often clasping the stem, alternate, yz to \]/i inches long, spinulose-dentate; the flower heads yellow, about 1 inch wide, solitary and terminal on the branches, very gummy and sticky. The leaves and flowering tops collected during fu
The drug plants of Illinois drugplantsofilli44teho Year: 1951 62 ILLINOIS NATURAL HISTORY SURVEY Circular 44 GRINDELIA SQUARROSA (Pursh) Dunal. Gum-plant, tar-weed, gum weed, rosin-weed. Compositae.—An erect, branched, gummy, smooth, var- nished-looking herb 8 to 24 inches tall, biennial or perennial; stems often reddish; leaves spatulate or oblong, sessile, often clasping the stem, alternate, yz to \]/i inches long, spinulose-dentate; the flower heads yellow, about 1 inch wide, solitary and terminal on the branches, very gummy and sticky. The leaves and flowering tops collected during full bloom. Rare to infrequent in gravelly and sandy, open soils and along railroads across northern Illinois and south to La Salle County. Contains a resinous varnish in which are the active principles, a volatile oil, a resin, and the alkaloid grindeline. Used as a stimulant for mucous membranes and as an antispasmodic. {^Grindelia robusta Nutt. of the Pacific coast is the plant that formerly was official. It and the foregoing species are believed to be about equally efficacious and are often mixed,]
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