888 REPORT OF STATE GEOLOGIST. 



of Polygonums and other herbs. It attacks almost any fairly suc- 

 culent herbaceous plant and makes a remarkably rapid growth 

 when it has secured attachment to the host. Its orange-yellow 

 color makes it of fairly easy recognition. It is very difficult to 

 exterminate when ii has once obtained a foothold. 



Flowers from late in July until September. More abundant 

 in northern counties. 



Marion and Lake; Vigo (Blatchley); Kosciusko (Coulter); Tip- 

 pecanoe (Wright); Montgomery (J. M. Coulter). 



C. Cephalanthi Engelm. Button-bush Dodder. 

 (C tenuiflora Engelm.) 

 Parasitic upon shrubs and tall, hard-stemmed herbs. In our 

 area more frequently found upon the Button-bush than any other 

 form. Probably found throughout the State, but definitely re- 

 ported from but few counties. 

 Flowers in July and August. 

 Lake (Hill); Hamilton (Wilson). 



C. Gronovii Willd. Common Dodder. 



Our most widely distributed and abundant form. Parasitic on 

 herbs and low shrubs, and preferring rather moist soils, though 

 thriving well in dry fields. All the Cuscutas are variable, but this 

 species has a very wide range of variation in both habit and char- 

 acter of its station. 



Flowers in July and August. 



Jefferson (Barnes); Putnam (MacDougal); Clark (Baird and 

 Taylor); Gibson and Posey (Schneck); Noble (Van Gorder); 

 Franklin (Meyncke); Jay, Delaware, Eandolph, and Wayne 

 (Phinney); Fayette (Hessler); Hamilton (Wilson); Vigo (Blatch- 

 ley); Steuben (Bradner). 



C. compacta Juss. Compact Dodder. 



Not uncommon on shrubs, but not nearly so abundant as the 

 preceding forms. It has probably not been separated by collectors 

 from G. Gronovii on the one hand and G. paradoxa on the other. 

 In our range it is ordinarily found in rather dry regions, and 

 seems better able to resist excess sunlight than the other members 

 of the genus. 



Flowers in July and August. 



Posey and Gibson (Schneck); Montgomery (Cunningham). 



