319] FLORA OF COLUMBIA AND VICINITY 1 77 



640. H. subpetiolatum Bicknell. 

 Common in oak woods and thickets. 



Maine to New York; Georgia to Tennessee and Mis- 

 souri. 



641. H. pseudomaculatum Bush. 

 Pansy Hill and other clay barrens. 

 Illinois to Missouri and Arkansas. 



642. H. perforatum L. Common St. John's-wort. 

 Roadsides and waste places; uncommon. 



Canary Islands, Europe and Siberia, thence to North 

 America. 



643. H. proliflcum L. Shrubby St. John's-wort. 

 Common in thickets in both low and rocky ground. 

 New Jersey to Michigan and Minnesota; Georgia to 



Arkansas. 



644. H. nudiflorum Michx. 

 Dry thickets; scarce. 



North Carolina and Florida to Texas; Missouri (Shan- 

 non County; Boone County). 



645. H. sphaerocarpum Michx. [//. cistifolium Lam.]. 

 Common on rocky hillsides and cliffs. 



Ontario to Illinois and Missouri; Alabama to Arkansas. 



646. H. mutilum L. 



Low swampy grounds and stream-banks; common. 

 Nova Scotia to Manitoba; Florida to Texas. 



647. H. Drummondii (Grev. & Hook.) T. & G. [5. Drmn- 

 mondii Grev. & Hook.]. 



Dry open places; rare except near the Pinnacles. 

 Virginia to Illinois and Missouri; Florida to Missouri. 



Family 72. CISTACEAE Lindl. Rockrose family. 



255. HELIANTHEMUM Tourn. Frost-weed. 



648. H. majus (L.) B. S. P. Hoary frost-weed. 

 Scarce on high bluffs. 



Maine to Minnesota and South Dakota; Georgia to 

 Texas. 



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