316 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
MENYANTHES. Buckdean. 
M. trifoliata L. Buckbean. — Bogs; frequent. 
NYMPHOIDES. Im^oatino Hkaht. 
{Liimnanthemum. ) 
N. lacunosum (Vent.) Fernakl. 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. 
Fl. 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. 
