Rhus 



Anacardiaceae 



649 



50 



Map 1349 



Rhus glabra L 



o 5o 



Map 1350 



Rhus typhina L 



~~ 50 



Map 1351 



Rhus radicans L 



Petiolules of leaflets less than 3 cm long; fruit red and densely pubescent. 



Terminal leaflet mostly ovate-lanceolate; flowers usually appearing before the 



leaves 7. R. aromatica. 



Terminal leaflet mostly obovate ; flowers usually appearing with the leaves 



8. R. trilobata var. arenaria. 



1. Rhus copallina L. Shining Sumac. Map 1347. Rather frequent in 

 some of the northwestern and southern counties, being rare or local in the 

 remaining counties, or absent in some of the east-central counties. It 

 prefers a rather dry sandy soil and is found mostly in the open along 

 roadsides, fences, and railroads and in abandoned fields and open woodland. 



Fernald & Griscom (Rhodora 37: 167-168. 1935) write that the typical 

 form of this species has "lance-oblong leaflets definitely attenuate at the 

 base" and more leaflets than our interior plant. They give the range of 

 the typical form as along the coast from New York to Florida. They add 

 that our form "has the comparatively few leaflets more ovate-lanceolate or 

 short-oblong and rounded at the base," and should be known as var. 

 latifolia Engler (DC. Mon. 4: 384. 1883) with a range from Maine to 

 Michigan, southward into the upland of North Carolina and Oklahoma. 

 Most of my specimens belong to this wide-leaved variety, and I have the 

 typical form from Starke and from the Ohio River Counties. However, 

 since we have forms intermediate between these two extremes, it seems 

 best not to separate them in our area. 



Maine, s. Ont. to Minn., southw. to Fla. and Tex. 



2. Rhus Vernix L. ( To xicodendron Vernix (L.) Ktze.) Poison Sumac. 

 Poison Elder. Map 1348. Poison sumac is frequent in low ground about 

 lakes and in bogs in the lake area. South of this area I have found it in 

 springy areas as shown on the map. This species must have a springy or 

 bog habitat in which to live. I have had the opportunity to watch the 

 species in three bogs that were drained, and it gradually died out. 



Northern N. E. to Minn., southw. to Fla. and Tex. 



