322 ECONOMIC BOTANY OF ALABAMA 



DIERVILLA, Moench. 

 Diervilla rivularis, Ciattinger. 



A small deciduous shrub with small yellow flowers in sum- 

 mer, followed l)y bottle-shaped dry pods. Ornamental, but rare 

 and little known. 



Grows on rocky banks of streams in the plateau region (3A). 



Jackson County (Harbison). Marshall, DeKalb and Cherokee 



Counties. 



D. scssilifolia Buckley, a similar species, chiefly confined to the moun- 

 tains of North Carolina and Tennessee, has been credited to Alabama with- 

 out definite locality, but the preceding species may have been mistaken 

 for it. What seems to be this, however, has been pointed out to me along 

 Eight-Mile Creek in Cullman County by W. Wolf (September, 1927). 



AMBROSIACEAE. Ragweed Famiev. 



About 8 genera and To species, mostly herbs, but incltides a 

 few shrubs. United by many atithors with the next family. 



IVA, Linnaeus. Marsh Elder, etc. 

 Iva imbricata, Walt. 



A weak succulent evergreen shrub, a few feet tall. Economic 

 properties unknown. 



Grows on beaches and dunes. Fotmd by Dr. Mohr on West 

 Fowl River, Mobile County. 



Iva frutescens, L. 



A short-lived weedy-looking shrub, with no known use. 

 Grows on the edges of brackish and salt marshes, about high 

 tide mark. Mobile and Baldwin Counties (Mohr). 



COMPOSITAE (or CARDUACEAE). 



Thistle or vSunflower Family. 



The largest family of flowering plants, with al)out 800 genera 

 and at least 10,000 species, of world-wide distribution. The great 

 majority are herbs, but there are a few shrubs and even trees in 

 warm-temperate regions. Several species yield food, medicine, dye, 

 etc., and hundreds are cultivated for ornament. A still greater 

 number are weeds. Otir woody ones are chiefly confined to the 

 vicinity of the coast, as in the preceding family. 



