S2 UNIVERSITY OF MISSOURI STUDIES [224 



Order 3. EQUISETALES. 

 Family 3. EQUISETACEAE Michx. Horsetail family. 

 13. EQUISETUM L. Horsetail. 



16. E. arvense L. Common horsetail. 

 Sandy banks; common. 



North America: Europe and Asia. 



17. E. pratense Ehrh. Thicket horsetail. 

 Swales and low thickets. 



Nova Scotia to Alaska; New Jersey to Colorado: 

 Europe and Asia. 



18. E. hiemale L. Scouring rush. 

 Low sandy or clay banks; common. 

 Northern Hemisphere. 



ig. E. variegatum Schleich. Small scouring rush. 



Limose flats of the Missouri near Rocheport. No fruit- 

 ing culms seen. 



Greenland and Labrador to the Northwest Territory; 

 New York to Missouri and Nevada: Europe and Asia. 



Subkingdom II. SPERMATOPHYTA. Seed plants. 



Class I. GTMNOSPERMAE. 



Order 4. CONIFERALES. Conifers. 



Family 4. PINACEAE Lindl. Pine family. 



14. JUNIPERUS L. [SABINA Haller]. Juniper. 



20. J. Virginiana L. [S. Virginiajia (L.) Antoine]. 

 Red cedar. 



Common on the summits of cliffs, but also frequent 

 along streams and on hillsides. 



Southern British America and throughout the United 

 States; Mexico and the West Indies. 



