MICHIGAN ACADEMY OF SCIENCE. 185 



Apocynaceae. Dogbane Family. 



Vinea minor L. Common Periwinkle. — Popularly called ''myrtle." — • 

 Noticed as a frequent permanent escape. 



Apocynum androsaemifolium L. Spreading Dogbane. — Common in dry 

 ground, o]3en woods and thickets. 



Apocynum cannabinum L. Indian Hemp. — Frequent in damp and marshy 

 ground. Bark has a very strong fiber which was formerly used by the 

 Indians for strings. 



Apocynum cannabinum pubescens (R. Br.) DC. Velvet Dogbane. — Fre- 

 quent in dry ground. Noticed in particular near Blackwell Station. 



Apocynum cannabinum hypericifolium (Ait.) Gray. Clasping-leaved Dog- 

 bane. — Frequent in damp and marshy ground, perhaps the prevailing form 

 in this locahty. . 



Asclepiadaceae. Milkweed Family. 



Asclepias tuberosa L. Butterfly-weed. — Frequent in dry and sandy 

 ground. The prostrate form now included with this species but formerly 

 named A. decumbens L., decumbent butterfly-weed, is plentiful near Black- 

 well Station. 



Asclepias purpurascens L. Purple Milkweed. — Occasional in damp or 

 dry ground. 



Asclepias incarnata L. Swamp Milkweed. — Very common in open wet 

 and marshj^ places. 



Asclepias syriaca L. Common Milkweed. — Very common in poor and dry 

 ground. Often a Ijad field weed. 



Asclepias sullivantii Engelm. Sullivant's Milkweed.— Frequent in damp 

 ground on the delta islands of St. Clair River. 



Asclepias phytolaccoides Pursh. Poke Milkweed. — Frequent in rich 

 ground, open woods and thickets. 



Acerates viridiflora Ell. Green Milkweed. — Frequent on sand ridges, and 

 in sand along Lake Huron shore. T. C. Wheatley. 



Acerates viridiflora lanceolata (Ives) Gray. Lance-leaved Green Milk- 

 weed. — Frequent in sandy ground along Lake Huron shore. 



Convolvulaceae. Convolvulus Family. 



Ipomoea purpurea (L.) Roth. Common Morning Glory. — Inclined to 

 escape and persist in waste places in towTis and cities. 



Convolvulus spithamaeus L. L'pright Bindweed. — Occasional in dry and 

 sandy groimd. 



Convolvulus sepium L. Hedge Bindweed. — Frequent in damp ground and 

 along banks of streams. 



Convolvulus arvensis L. Field Bindweed. Common about towns and 

 cities along railroads and in fields. 



Cuscuta epithymum Murr. Thyme Dodder. Clover Dodder. — Occa- 

 sionally^ found on clover. Newton Tripp. 



Cuscuta gronovii, Willd. Gronovius' Dodder. — Frequent and usually in 

 damp ground. A })arasite on herbaceous plants and shrubs. 



Polemoniaceae. Polemonium Family. 



Phlox paniculata L. Garden Phlox. — Inclined to escape Jo roadsides and 

 persist. 



