^ STATE GEOLOGIST. 37 



EUTACExE. PtiTE Family. 



XAXTHOXYLUM, Golden. Pkickly Ash. 



X. Ajiaericaniim, Mill. Northern Prickly Ash. Toothache -tree. 



Vei-j' abundant southward; extending north to Fine, Aitkin. Cass and Polk counties. 



PTELEA, L. Shrubby Trefoil. Hop-tree. 



P. trifoliata, L. Shrubby Trefoil. Hop-tree. Wafer Ash. 

 Lc^p^u'tm. Southeast. 



ANACARDIACE^. Cashew Family. 



KHUS, L. Sumach. 



E. typhiua. L. Staghorn Sumach. 



Limited to the east side of the state and the region from the upper Mississippi river 

 northeastward, as follows : in Houston and Fillmore counties, rare ; in Winona county 

 the most frequent species on the bluffs of the Mississippi ("at Winona samples were 

 seen eight inches In diameter", WiHchell), but rare farther west ; common in Kamsey 

 and Hennepin counties, extending west into the Big Woods, and to Martin county, 

 Cratty: rare in Benton county; common In Pine county and westward to MlUe Lacs, 

 Little Falls and lake Alexander, Morrison county ; at Fish-hook lake in southwestern 

 Cass county. Garrison-^ and occasional northeastward, being reported by Clnrh- at Sandy 

 lake, Fohddu Lac, Grand Portage and Pigeon river. 



R. glabra. L. Smooth Sumach. 



Coinmon throughout the state, excepting north of lake Supsrior, where it is rare. 



JR, copalliiia, L. Dwarf Sumach. 



Houston county, near La Crescent, also in Winona county, Winchell ; lake Pepin. 

 Mi.s-s Mamiinu; Goodhue county, Sandhcrg-^ Saint Paul, Miss Catheart-^ Blue Earth 

 county . Leiherg -^ Worthington, Foofe; Pipestone county, iVfr.s. Be;w(efi. tlare. South. 



R. veuenata, DC. Poison Sumach. Poison Dogwood. 



C>bserved, like the preceding, in Hc;ustou county, near La Crescent, and in Winona 

 county, by Prof. WinrheU-^ Hennepin county, Simmons; Anoka county, Juni ; upper 

 Mississippi river, Garrison. Pare. 



K. Toxicodendron, L. Poison Ivy. Poison Oak, 



Common, often abundant, throughout the state. (Erect or decumbent, 1 to 3 feet 

 high ; not climbing,] 



K. Toxicodendron, L., var. radicans, Torr.* Climbing Poison Ivy. 



This variety (or species) occurs sparingly in the southeast part of the state. 

 Mrs. Carter, Miss Manniiuj- 



R, ai'oniatica, Ait. Fragrant Sumach. 



Maligne river (near the international boundary east of Rainy lake), Macouii. Pare. 



*Khus Toxicodendron, L., var. radicans, Torr. (E. radicans, L.) Stems climb- 

 ing by means of innumerable radicating tendrils ; leaflets 3, ovate, dark green, smooth 

 and shining, entire, the lowest rarely angular ; flowers greenish, racemed in axillary 

 panicles ; berries dull white. A vigorous woody climber, ascending trees and other 

 objects 10 to 40 or 50 feet. The stem becomes 1 to 2 inches [or more] in thickness, 

 covered with a greeuith, scaly bark, and throws out all along its length myriads of 

 turead-like rootlets, which bind it firmly to its support. TT'oort's Class-Boo}:. 



