MICHIGAN ACADEMY OF SCIENCE. 159 



Betula pumila L. Low Birch. — Occasional in bogs and swampy places. 

 Alnus incana (L.) Muench. Speckled Alder. Hoary Alder. — Common in 

 swamps, wet open woods, and along streams. 



Fagaceae. Beech Family. 



Fagus grandifolia Ehrh. Beech. — Frequent in rich ground with other 

 trees. 



Castanea dentata (Marsh.) Berkh. Chestnut. — Occasionally planted, but 

 not native or spreading so far as noticed, but pioneers report native trees as 

 formerly existing in eastern part of county. 



Quercus alba L. White Oak. — Frequent and usually in dryish, but good 

 ground. Noticed occasionally in poor sandy ground, especially along the 

 Lake Huron shore. 



Quercus macrocarpa Michx. Bur Oak. — Frequent and usually in good 

 ground, but occasionally on sandy ridges near the shore of Lake Huron, 

 where it is small and becomes a good sand-binder. 



Quercus bicolor Willd. Swamp White Oak. — Frequent and usually in 

 rich ground with other trees on borders of swamps and streams. 



Quercus muhlenbergii Engelm. Chestnut Oak. Frequent among the 

 sand dunes at Port Franks, and farther west near lake shore. 



Quercus prinoides Willd. Scrub Chestnut Oak. — Abundant on the sand 

 dunes at Port Franks. Not noticed elsewhere. 



Quercus rubra L. Red Oak.^Common in poor and sandy ground, fre- 

 quent also in rich woods. 



Quercus palustris Muench. Pin Oak. — Abundant in low wet ground on 

 the delta islands of St. Clair River; also on the mainland where it probably 

 reaches its northern hmit. 



Quercus coccinea Muench. Scarlet Oak. — Occasional along the sandy 

 shore of Lake Huron. Noticed in particular at Port Franks, but doubtful 

 elsewhere. 



Quercus velutina Lam. Yellow Oak. Yellow-barked Oak. Black Oak. 

 — Common in poor and sandy ground, especiall}- along Lake Huron shore. 



Urticaceae. Nettle Family. 



Ulmus fulva Michx. Slippery Elm. Red Elm. — Occasional along banks 

 of streams. Frequent along the Aux Sables river and its branches. 



Ulmus americana L. American Elm. White Elm. — Very common on 

 rich and wet ground. Formerly the most common tree in the count3\ 



Ulmus racemosa Thomas. Cork Elm. Rock Elm. — Occasional and usu- 

 ally in rich damp ground. Plentiful along the Aux Sables River. 



Celtis occidentalis L. Sugarberry. — Along the Aux Sables river but ap- 

 parently infrequent. Rev. H. Currie. 



Celtis occidentalis pumila. ]Muhl. Small Sugarberry. — A shrub seldom over 

 10 feet high. Al:)undant on sand dunes at Port Franks. 



Celtis occidentalis crassifolia (Lam.) Gray. — Occasional along the Aux 

 Sables river. Newton Tripp. 



Cannabis sativa L. Hemp. — Occasionally noticed as estabhshed along 

 roads and in waste places. 



Humulus lupulus L. Hop. Hops. — Occasionally noticed as an escape along 

 fences. 



Madura pomifera (Raf .) Schneider. Osage Orange. — Occasionally planted 



