Co Ca Gr St Be Me Sii Ro Hi Ch 



P. Cerasus 

 P. serotina 

 P. virginiana 

 Gleditsia triacanthos 

 Amorplia fruticosa 

 Robinia Pseudo-Acacia 

 R. viscosa 

 R. hispida 

 Xantlioxylum 



americanum X 



Ptelea trifoliata i i i 



Empetrum nigrum 

 E. atropurpureum 

 Rhus typhina 

 R. glabra var. glabra 



var. borealis 

 R. copallina var. latifolia 

 R. Vernix 

 R. radicans var. radi:ans 



var. vulgaris 



var Rydbergii 

 Ilex verticillata var. 



verticillata 



var. padifolia 



var. tenuifolia 

 I. laevigata 

 I. glabra 



Nemopanthus mucronata 

 Euonymus europaeus 

 Celastrus scandens 

 Staphylea trifolia 



R. hispida L. Bristly Locust. 



Lucal escape from cultivation; stations in P)arrington and Tamwortli : introduced 

 from farther south in United States. 



Xanthoxylum americanum Mill. Northern Prickly Ash. 



Rare and local; confined to southern New Hampshire; stations in .Alstead, Win- 

 chester, and Nashua; rich woods; reported from Surry: Rhodora .^ :2,i4, 1^01. 



Ptelea trifoliata L. Hop-tree. 



Occasional escape from cultivation into thickets and waste places; stations in 

 Rollinsford, Laconia, and Milford: introduced from south and west of New England. 



Empetrum nigrum L. Black Crowberry. 



Common in alpine and subalpine areas of Presidentia^l and Franconia ranges, 

 descending to summits of some of lower peaks in northern and north central New 

 Hampshire ; gravelly and peaty soils sometimes in boggy habitats : the purplish 

 fruited f. pnrpurcnm ( Raf . ) Fern., and whitish f. Icucocarpiiiii F. M. Neuman are 

 perhaps to be expected but have not yet been reported. 



35 



