. The drug plants of Illinois. Botany, Medical; Botany. 94 ILLINOIS NATURAL HISTORY SURVEY Circular 44. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tehon, L. R. (Leo Roy), 1895-1954. Urbana, Ill. : Natural History Survey Division

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