050 Anacardiaceae Rhus 



3. Rhus glabra L. (Rhus arbuscula Greene and Rhus media Greene.) 

 Smooth Sumac. Map 1349. Infrequent throughout the state, preferring 

 open places in dry, sandy or gravelly soil, or sometimes in moist loam and 

 poor clay soil of hills. It prefers the open and is found along roadsides 

 and fences and in abandoned fields and open woodland. 



N. S. to N. Dak., southw. to Fla. and La. 



3a. Rhus glabra var. borealis Britt. Barkley (Amer. Midland Nat. 19: 

 598-599. 1938.) has tentatively referred my specimens nos. 58424 A, 58427, 

 58544L, 58544M, 58544N to this variety. These were collected along the 

 roadside about 3 miles northwest of Angola, Steuben County, with Rhus 

 glabra, Rhus typhina and X Rhus pulvinata. 



4. Rhus typhina L. (Rhus hirta (L.) Sudworth.) Staghorn Sumac. 

 Map 1350. Infrequent or local in the lake area in moist places about lakes, 

 bogs, swamps, and low places in general, rarely on rocky slopes. In south- 

 ern Indiana I have collected it on the high, wooded ridge along Sugar 

 Creek, just east of Deer's Mill in Montgomery County, and on the bluffs of 

 the Ohio River in Switzerland County. It has been reported also from 

 Franklin, Knox, Posey, and Wayne Counties. 



The largest specimens I ever saw were growing in dry soil in the yard 

 of W. H. Montgomery in section 25, about 4 miles southeast of Bryant, 

 Jay County. The larger was 30 inches and the smaller was 29 inches in 

 circumference at breast height. These were root shoots of older trees 

 which had formerly grown in his yard, and Mr. Montgomery estimated 

 that these trees were about 20 years old. The bole of each was about 6 

 feet high. Since these trees were attractive, round-topped shade trees, this 

 species might well be used for that purpose. 



N. S., Ont. to S. Dak., southw. to Ga. and Miss. 



5. X Rhus pulvinata Greene. (Fedde, Rep. Spec. Nov. 5: 45. 1908.) 

 (Rhus glabra X typhina.) Barkley discusses the status of this hybrid in 

 Amer. Midland Nat. 19 : 589-599. 1938. He has referred my nos. 58424B, 

 58534A, 58534B, and 58534L to this hybrid. He refers also to it, speci- 

 mens which I collected in Fulton County and some that Nieuwland col- 

 lected in St. Joseph County. Doubtless this hybrid is sporadic within the 

 range of the parent species. 



6. Rhus radicans L. (Toxicodendron radicans (L.) Kuntze, Rhus rufes- 

 cens Greene, and Rhus Toxicodendron L. of Deam, Shrubs of Indiana, 

 revis. ed. 1932.) POISON Ivy. Map 1351. An infrequent to common vine 

 throughout Indiana. It will grow anywhere except in low peaty soil. 

 The species has two habits of growth: the one climbing and the other 

 erect. The climbing form is the more common, being in all places where 

 the erect form is not found. It is found mostly along fences and in open 

 and thick woods. In the Lower Wabash Bottoms it reaches a diameter 

 of 3 inches and climbs to the tops of the tallest trees. The erect form is 

 usually less than 3 feet high and is found in hard, minimacid soil in some 

 of the southern counties, where it is usually associated with sweet gum, 

 and in the dunes along Lake Michigan. The species is extremely variable 



