No. 14.] FLOWERING PLANTS AND FERNS. 323 



Asclepias amplexicaulis Sm. (stem-clasping; referring to the 



leaves). 

 Asclepias obtusifolia Michx. 



Open ground in sandy soil. Rare or local in southern 

 Fairfield County, occasional or frequent elsewhere. June — 

 July. 



Asclepias phytolaccoides Pursh (like Phytolacca, the Poke- 

 weed). 



Asclepias exaltata Muhl. ( ?) . 



Poke Milkweed. 



Occasional. Moist woods and thickets. Late June — July. 



Asclepias variegata L. (of various colors). 



Rare. Dry woods: Norwich (Miss Wohlfurth), East 

 Lyme (Miss A. M. Ryon), Portland (Dr. E. J. Thompson). 



July. 



Asclepias quadrifolia Jacq. (four-leaved). 



Occasional. Dry woods. June — July. 



Asclepias verticillata L. (whorled) . 

 Whorled Milkweed. 



Occasional or local. Sandy or sterile ground. July — 

 Aug. 



ACERATES Ell. Green Milkweed. 

 Acetates viridiflora Ell. (green-flowered). 



Rare. Dry open ground: East Haven (O. Harger, H. 

 S. Clark), Oxford (Harger), New Milford (Eames). July 

 — Aug. 



The var. lanceolata (Ives) Gray (lance-shaped), var. 

 Ivesii Britton, has been found at New Haven (E. Ives). 



CYNANCHUM L. 

 Cynanchum nigrum (L.) Pers. (black). 

 Vincetoxicum nigrum Moench. 

 Black Swallow-wort. 



Rare. Roadsides and fields as an escape from cultivation; 

 Stonington (W. E. Britton), New London (Graves), New 

 Haven (H. S. Clark, Harger), Oxford (Harger), Orange 

 and Bridgeport (Eames), Stamford (W. H. Ho)rt). June — 

 July. Adventive from Europe. 



