Abstract
River. The same species was seen at Wray, Colorado. In northwestern Kansas, at St. Francis, E. laevigatum was found on the wet sandy banks of the Republican River while E. kansanum was growing in a grassy creek bottom near swampy ground. No more Equisetum was seen until we were going through the broad Republican River valley, north of Concordia, where tall E. lacvigatunm was present in abundance along the road. Finally we arrived for a five-weeks' stay at our Prairiedell Farm, near Morganville, Kansas, where E. kansanum grows in suitable habitats on the upland, especially on clay banks and E. laevigatum on the flood plain of the Republican River. E. praealtum also grows along streams but is seldom found and the same is true for E. arvense. For over 30
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