FLORA OF MICHIGAN. 61 



* 211. A. spictatum, Lam. Mountain Maple. C. N. & U. P. 

 Common in U. P.; Alcona Co., Winch. Cat.; Crystal Lake, Montcalm [Co. 



* 212. A. saccharinum, Wang. Rock or Sugar Maple. Th. 



Frequent in the U. P., and abundant in the lower, forming extensive groves, either alone or in con- 

 nection with beech. 



* 213. var. nigrum, T. & Gr. Black Sugar Maple. Th. 



Along with the preceding, and much resembling it. Distinguished bestjby its prominent stipules and 

 downy leaves. Common. 



* 214. A. dasycarpum, Ehrh. White or Silver Maple. C. & S. 



Low ground along rivers. Common. 



*215. A. rubrum, L. Red or Swamp M. Th. 



On low ground and along streams. Very common. 



83. NEOUN1>O, Moanch. ASH-LEAVED MAPLE. BOX-ELDEB. 



*216. N. aceroides, Moanch. Th. 



River banks. A small, handsome tree, with glaucous green twigs, ash-like leaves, and pendant flowers 

 and keys. West of Lake Superior, and north to Saskatchewan Valley, Macoun.i Canadian Catalogue. 

 Frequent in Grand River Valley. 



84. STAPHYL.EA, L. BLADDER-NUT. 



*217. S. trifolia, L. American Bladder-nut. Th. 



Marquette Co., and southward, Burt. Frequemt along river banks in L. P. 



XXVII. ANACARDIACEJE. CASHEW FAMILY. 



85. RHUS, L. SUMACH. 

 *218. R. typhina, L. Staghorn Sumach. Th. 



Seldom very large; less common than the next. 



* 219. R. glabra, L - Smooth S. Th. 



Very common in C., and nearly, or quite, as large as R. typhina. The trunk occasionally 5-10 in. in 

 diameter. These two species are much alike, and, pubescence aside, one might easily be mistaken for the 

 other. It is no stretch of imagination to believe that such closely allied species, and there are many 

 such, are descended from a common stock. Indeed, one can scarcely believe otherwise if he studies 

 plants extensively. 



* 220. R. copallina, L. Dwarf S. C. & S. 



Abundant in the pine country on light soil. 



* 221. R. veneiiata, DC. Poison Sumach or Dogwood. L. P. 



Common in swamps and poisonous to the touch. A low shrub, with smooth, grayish bark, and dull, 

 white fruit in clusters. Green Lake, G. Traverse Co. and southward. 



* 222. R. Toxicodemlron, L. Poison Ivy. Poison Oak. Th. 

 Tall-climbing, often to tops of forest trees ; stems occasionally several inches in diameter. 



223. R. Canaclensis, Marsh. Fragrant Sumach. Th. 



Less frequent than other members of the genus. Found chiefly on bluffs and sandy hills through the 

 middle counties of the L. P. "N. to the Saskatchawan," Torr. & Gr., PI. N. Am. 



XXVIII. POLYGALACE^E. MILKWORT FAMILY. 



86. POLYGALrA, Tourn. MILKWORT. 



*224. P. paucifolia, Willd. Flowering Wintergreen. Fringed Polygala, Th. 

 Common on pine land ; the large, rose-purple flowers very beautiful. 



*225. P. polygama, Walt. Th. 



Sandy soil. Ionia, Clinton. Montcalm, and counties southward. Infrequent. Abundant near Quin- 

 , Menominee Co., E. J. Hill. 



