316 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



MENYANTHES. . Btjckbean. 

 M. trifoliata L. Buckbean. — Bogs; frequent. 



NYMPHOIDES. Floating Heart. 

 (lAmnanthemum.) 



N. lacunosum (Vent.) Fernald. Floating Heart. — Shallow 

 water in cool ponds; occasional. Becket; Lee Pond, Mt. Washing- 

 ton; Parish Pond, Otis (Walters). 



APOCYNACEAE. . DOGBANE FAMILY. 

 APOCYNUM. Dogbane. 



A. androsaemifolium L. Spreading Dogbane. — Roadside 

 thickets, borders of woods and rocky summits; common. 



A. cannabinum L. Indian Hemp. — Low ground and gravelly 

 shores; common. 



A. medium Greene.^- Flood-plain of the Deerfield River, Florida; 

 roadside, Great Barrington. 



VINCA. Periwinkle . 



V. MINOR L. Periwinkle; Blue Myrtle. — Established and 

 spreading about old houses and in cemeteries; occasional. 



ASCLEPIADACEAE. MILKWEED FAMILY. 

 ASCLEPIAS. Milkweed. 



A. amplexicaulis Sm.^ Sand-plain, Ashley Falls, Sheffield. 



A. incarnata L. Swamp Milkweed.^ — Borders of streams and 

 ponds, and marshes; common in, the valley. 



var. pulchra (Ehrh.) Pers. — {A. pulchra 111. Fl. ed. 2.) 



Low ground; common on the plateau. 



A. phytolaccoides Pursh. Poke Milkweed. — {A. exaltata 111. 

 FI. ed. 2.) 



Roadside thickets and rich open woods, generally on the upland; 

 frequent. 



A. quadrifolia Jacq. — Dry rocky woods; occasional in the south- 

 ern part of the valley. Stockbridge; Great Barrington; Egremont; 

 Sheffield; Mt. Washington. 



