Cuscuta 



CONVOLVULACEAE 



773 



50 



Map 1665 



Cuscuta Gronovn Wi lid. 



50 



Map 1666 



Cuscuta Cephalanthi Engelm 



50 



Map 1667 



Cuscuta Coryli Engelm. 



Hosts of my specimens are as follows: 1 on Daucus Carota, 3 on 

 Euphorbia corollata, 1 on Lespedeza, 1 on Lespedeza striata, 8 on Trifolium 

 pratense. 



Mass. to Fla., westw. to Calif. 



5. Cuscuta campestris Yuncker. {Cuscuta pentagona var. calycina 

 Engelm.) Map 1664. Yuncker referred my specimens named Cuscuta 

 pentagona var. calycina to this species. 



U. S., W. I., and S. A. 



6. Cuscuta Gronovii Willd. (Cuscuta Gronovii var. vulvivaga Engelm.) 

 Gronovius Dodder. Map 1665. This species is parasitic mostly on plants 

 of a wet habitat. The following is a list of the hosts of my speci- 

 mens; 3 on Aster, 4 on Boehmeria, 2 on Campsis, 3 on Cephalanthus, 

 1 on Dianthera, 1 on Decodon, 1 on Eupatorium, 1 on Helianthus, 1 on 

 Hypericum, 19 on Impatiens, 1 on Lactuca, 1 on Laportea, 2 on Mentha, 

 1 on Phytolacca, 1 on Polygonum, 1 on Rubus, 2 on Saururus, 2 on Salix, 

 3 on Solidago, and 1 on Vernonia. 



This species is variable in the size and proportion of its flower parts. 

 Two specimens of var. vulvivaga from Steuben County were cited by 

 Yuncker (Univ. of Illinois Biol. Monographs 6: 66. 1921) but in 1932 he 

 refers this variety to the species. Accordingly, a report from Porter 

 County by Lyon is referred to C. Gronovii by Buhl (Amer. Midland Nat. 

 16: 252. 1935). 



N. S. to Man., southw. to Fla., Tex., and Ariz. 



6a. Cuscuta Gronovii var. calyptrata Engelm. "This variety differs 

 from the typical form in the usually longer corolla lobes less than half 

 as long as the tube. The calyx lobes are oval-oblong and commonly ser- 

 rated. The withered corolla caps the capsule" (Mem. Torrey Bot. Club 18: 

 175. 1931) . I found it in Clark County on Solidago and in Sullivan County 

 on Saururus. 



