198 UNIVERSITY OF MISSOURI STUDIES [340 



323. LITHOSPERMUM L. Gromwell. 



763. L. arvense L. Corn gromwell. 

 Waste places and grainfields; frequent. 

 Europe and Asia, thence to North America. 



764. L. ofBcinale L. Common gromwell. 

 About the railroad at Rocheport. 



Europe and Asia, thence to North America. 



765. L. canescens (Michx.) Lehm. Hoary puccoon. 

 On barren hills and cliffs, and in dry woods. 



New Jersey to Ontario and the Northwest Territory; 

 Georgia to Arizona. 



324. ONOSMODIUM Michx. False gromwell. 



766. O. molle Michx. Soft false gromwell. 

 Dry cliffs and sterile hills; infrequent. 



Michigan and Manitoba to Saskatchewan; Missouri to 

 Texas and Arizona. 



Family 93. VERBENACEAE J. St. Hil. Vervain family. 



325. VERBENA L. Vervain. 



767. V. angustifolia Michx. Narrow-leaved vervain. 

 Dry fields and pastures; scarce. 



Massachusetts to Minnesota; Florida to Mississippi 

 and Arkansas. 



768. V. urticifolia L. White vervain. 

 Frequent in waste places. 



New Brunswick to Minnesota and South Dakota; Flor- 

 ida to Texas. 



769. V. hastata L. Blue vervain. 

 Rare along streams and railroads. 



Nova Scotia to British Columbia; Florida to New 

 Mexico. 



770. V. stricta Vent. Hoary vervain. 



Very common along roadsides and in dry fields. 

 Pennsylvania and Michigan to South Dakota and Wyom- 

 ing; Tennessee and Texas to New Mexico. 



