The Flora of the Cayuga Lake Basin 347 



c. Flowers double; leaves subhastate; plant escaped from cultivation. 



2. C. japonicus 

 c. Flowers single ; leaves cordate in outline ; plant native. 

 d. Foliage practically glabrous. 3. C. sepium 



d. Foliage downy. 3a. C. sepium, 



var. pubescens 

 a. Calyx bractless at base ; stigmas filiform. 4. C. arveusis 



1. C. spithamaeus L. 



Dry gravelly or rocky banks and talus, often in open woods, in subneutral soils ; 

 infrequent. June-July IS. 



Thatcher Pinnacles (D.) ; Enfield Glen (£>.!); hillside near Lick Brook; Coy 

 Glen; Thurston Ave., Cornell Heights; Fall Creek (£>.) ; the "Nook" (D.\) ; talus 

 near Esty; Taughannock (D.) ; Cayuga Lake shore, n. of King Ferry (£>.). 



N. S. to Man., southw. to Fla. and Ky. ; rare or absent on the Coastal Plain. 



2. C. japonicus Thunb. 



Dry soil about walls and in waste places; scarce. July 15-Aug. 

 South Ave. near Stewart Ave., Ithaca; Forest Home; and elsewhere. 

 Occasionally cultivated, and escaped from cultivation. Native of Asia. 



3. C. sepium L. Hedge Bindweed. Wild Morning-Glory. 

 Gravelly strands, alluvial banks, and shale talus ; common. July-Aug. 

 Especially abundant around . Inlet and Cayuga Marshes, and in the talus along 



the shore of Cayuga Lake; less frequent elsewhere. 



N. S. to B. C, southw. to N. C, Kans., and N. Mex., including the Atlantic Coastal 

 Plain. Found also in Eurasia. 



3a. C. sepium L., var. pubescens (Gray) Fernald. 



Dry open fields, in light soils ; rare. 



Top of hill e. of Inlet, Ithaca-Newfield town line. 



E. Que. to Fla., and rarely about the Great Lakes. 



4. C. arvensis L. Field Bindweed. 



Cultivated and waste places, in gravelly soils ; infrequent. June 20-July. 



Railroad embankment at East Ithaca ; E. State St., Ithaca, beyond the city line ; 

 Linden Ave. (Hazen St., D.) ; C. U. campus, along South Ave.; circus common, 

 s. of Percy Field (DA) ; Central N. Y. Southern R. R., near Esty; near Westbury 

 Bog. 



N. S. to Ont., Mont., and Wash., southw. to N. J., Kans., Nebr., N. Mex., and 

 Calif. Naturalized from Eu. 



Often a very serious pest. 



2. Cuscuta (Tourn.) L. 



a. Stigmas elongated; capsule regularly circumscissile by a thickened transverse joint; 

 calyx lobes acute; flower 5-merous. 

 b. Corolla campanulate, the lobes triangular, acute; stamens exserted; calyx close, 

 with triangular lobes. [C. Epithymum] 



b. Corolla short-urceolate, the lobes ovate-triangular, obtuse; stamens included or 

 nearly so; calyx very large, almost enveloping the very depressed flower, the 

 lobes broadly ovate. 1. C. Epilinum 



I. Stigmas capitate ; capsule indehiscent ; calyx lobes acute or obtuse ; flowers 4- or 

 5-merous. 

 b. Lobes of the corolla acute, inflexed ; calyx lobes acute or obtuse. 



