Orobanche 



Orobanchaceae 



861 



Catalpa speciosa War 



" 50 



Map 1878 



Conopholis amencana (L.f.) Wallr 



50 



Map 1879 



Orobanche ludoviciana Nutt 

 var. genuina 



Flowers solitary on long, naked peduncles, without bracts. 



Cauline scales glabrous; stems very short; peduncles 1-4, erect; calyx lobes 



lanceolate, acuminate 2.0. uniflora. 



Cauline scales pubescent; stems usually 4-10 cm long; peduncles several; calyx lobes 



broad, acute 3. O. fasciculata. 



1. Orobanche ludoviciana Nutt. var. genuina G. Beck. (Munz. The North 

 American species of Orobanche, section Myzorrhiza. Bull. Torrey Bot. Club 

 57: 620. 1930.) Map 1879. A very local plant in Indiana. It has been 

 reported from Jefferson and Vigo Counties and from the Lower Wabash 

 Valley. Usually a parasite on the roots of Ambrosia trifida. I found it 

 as a common plant on this host on the east bank of Goose Pond in Gibson 

 County. Miss Edna Banta found it on the roots of tobacco plants in 

 Jefferson County. In 1938 I found it in Knox County. 



Sask. southw. to Ind. and Tex. 



2. Orobanche uniflora L. var. typica Achey. (Thalesia uniflora (L.) 

 Britt.) One-flower Broomrape. Map 1880. This is a rare plant but prob- 

 ably found throughout the state. It has been reported from ten widely 

 separated counties. The plants I have found were parasitic on white and 

 chestnut oak. Bechtel found it parasitic on the roots of a Solidago in 

 Montgomery County. 



Newf. to Ont. and possibly B. C, southw. to Ga., Tex., and Calif. 



3. Orobanche fasciculata Nutt. var. typica Achey. (Thalesia fasciculata 

 (Nutt.) Britt.) Clustered Broomrape. Map 1881. This species has been 

 found only in Lake and Porter Counties in the dunes bordering Lake 

 Michigan. Most of the collections have been made on the low dunes just 

 south of Pine, in Lake County. Locally it is common. I have seen it only 

 on the low dune south of Pine where it was common on the roots of 

 Artemisia caudata. 



Ind. to Minn, and B. C, southw. to Nebr. and Calif. 



