MICHIGAN FLORA. 



445 



Hop-tree. 

 Shrubby Tre- 

 foil. 

 Wafer Ash. 



PTELEA 



190. trifoliata, L. (***) C. & S. 



An interesting shrub; sometimes cultivated. Very abundant on the low, 

 rocky islands in the western end of Lake Erie (1), and frequent along 

 river banks and the shore of the Gr. Lakes. Occurs in the interior as 

 far north as Montcalm Co. (!). Does not occur at Flint and is not men 

 tioned in Dr. Cooley's MS. Cat., but is given by Dr. Wright. 



ANACARDIACE^E. 



( Cash ew Fam ily . ) 



RHUS 



Staghorn Su- 

 mach. 



Smooth S. 



DwarfS. 



Poison S. 

 Poison Dog- 

 wood. 



Poison Ivy. 

 Poison Oak. 



Climbing P. 

 Ivy. 



Fragrant Su- 

 mach. 



191. typhina, L. (***) 



Seldom very large; 

 the next likewise. 



192. glabra, L. (**) 



Seldom very large; less common than the next, 

 the next likewise. 



193. 

 194. 



Th. 



Worth cultivating, and 



Th. 



Very common in C.,and nearly, or quite, as large as li. typhina. The trunk 

 occasionally 5-6 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 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. 



copallina, L. (**) C. & S. 



Abundant in the pine country on light soil. 



venenata, DO. (***) 



Common in swamps and poisonous to the touch. A low shrub, with 

 smooth, grayish bark, ancf dull, white fruit in clusters. 



Th. 



This is the dreaded "Poison Ivy." It is inoculous to some persons, and 

 cows eat it with impunity. Frequent. 



195. Toxicodendron, L. (**) 



This is the dreaded "Poison '. 

 cows eat it with impunity. 



196. Toxicodendron, L., var. radican, Torr. 



Tall-climbing, often 

 dies in diameter. ] 



19?. aromatica, Aiton. 



Th. 



Tall-climbing, often to tops of forest trees; stems frequently several in- 

 ches in diameter. More abundant than the sp. 



(***) Th. 



A low shrub, with bright red fruit; worthy of cultivation. 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 Saskatchawan."— 

 Torr. & Gr., Fl. N. Am. 



VITACE^E. 



(Vine Family.) 



Northern Fox- 

 grape. 



VITIS 



198. Labrnsca, L. 



Summer Grape. 



Frost Grape. 



0. &s. 



Concord, Isabella, Catawba, etc., are seedlings 



Rare. 



c. &s. 



Dr. Clark and Dr. Cooley. 

 of this species. 



199. aestivalis, Mx. 



Lyons (!); Stanton (!); Crystal Lk., Montcalm Co. (!); Flint; Ann Arbor.— 

 Winch. Cat.; S. Mich.— Wright Cat., etc. Infrequent S. 



200. riparia, Mx. Th. 



Common along our rivers; infrequent in the pine region, where V. aesti- 

 valis is very abundant. Flowers very fragrant, filling the air with 

 odor. The small, glaucous fruit is sometimes eaten. Vitis cordifolia 

 apparently does not occur. 



Virginia 

 Creeper. 

 Five-leaf Ivy. 

 American Ivy. 



AHPELOPSIS 



201. quinquefolia, Mx. (***) 



Th. 



A very desirable climber, often cultivated. Some specimens seem to 

 cling to Avails and buildings much better than others. Common. 



