CUSCUTACEAE 515 



4. I. hederacea Jacq. In fields and waste places: L. I. to Fla., 

 Pa., S. Dak., Neb. and Mex. Adventive from Trop. America. 

 Rare or occasional on cultivated areas or waste grounds, often 

 wanting. 

 /. hirsutula Jacq. has been found as a waif on S. I. 



4. Convolvulus L. 



Calyx with 2 large bracts at the base which enclose it. 

 Stems trailing or climbing. 



Glabrate; leaves hastate. 1. C. sepium. 



Pubescent; leaves sagittate. 



Flowers double, in our representative. 2. C. japonictts. 



Flowers single. 3. C. repens. 



Stems erect or ascending. 4. C. spithamaeus. 



Calyx not bracted; peduncle bracted at the summit; leaves entire, 



auriculate. 5. C. arvensis. 



i. C. sepium L. In fields and thickets: Newf. to N. Car., Br. 

 Col. and N. Mex. Also in Europe and Asia. 



Common in most parts of our range, except in the pine-barrens, 

 there rare. 



2. C. japonicus Thunb. In fields and waste places; Conn, to Mo. 



Locally established as a weed, mostly in a doubled-flowered 

 form with us. 



3. C. repens L. Moist and dry soil, Que. to Fla. and La. 



Frequent along the coast throughout our area; occasionally 

 introduced elsewhere. 



4. C. spithamaeus L. In dry, sandy, or rocky fields, or on banks: 



N. S. to the N. W. Terr., Ha. and Ky. 



Rare in our area, sometimes as a weed ; not reported from the 

 pine-barrens nor from S. I. 



5. C. arvensis L. In fields and waste places: N. S. to Ont., N. J., 



Neb. and Kan. Naturalized from Europe. 

 Locally common as a weed, often wanting. 



Dichondra repens Forst. has been collected as a waif, but is very doubtfully per- 

 sistent. 



CUSCUTACEAE 

 1. Cuscuta [Tourn.] L. 



Corolla-scales crenulate; stigmas slender; capsule circumscissile. 



Scales crenulate above, not incurved. 1. C. Epilimim. 



Scales crenulate all round, strongly incurved. 2. C. Epithymum. 



