THE GEOGRAPHICAL DISTRIBUTION OF NORTH DAKOTA PLANTS 24 1 
Poa pratensis 
Panicularia nervata 
Filix fragilis 
Equisetum arvense 
The remaining few species to be mentioned may be tabulated as follows : 
Species 
in New Mexico 
Euphorbia serpens Lower Sonoran 
Cyperus erythrorhizos 
Polygonum emersum 
Disporum trachycarpum Transition to Canadian 
Car ex aurea 
Calamagrostis canadensis 
Pyrola secunda 
Pyrola elUptica 
Rumex occidentalis . , 
Chamaenerion angustifolium . . 
Heracleum lanatum 
A ndrosace occidentalis 
Triglochin palustris 
Juncus longistylis 
Calochortus Nuttallii 
Rudbeckia laciniata 
Vagnera stellata . 
Agrostis hy emails . 
Dasiphora fruticosa . 
.Transition to Arctic Alpine 
Viola adunca Transition to Hudsonian 
Arctostaphylos Uva-ursi " " " 
Oxytropis deflexus Canadian 
Circaea alpina 
Corallorhiza multiflora 
Alsine longifolia 
Panicularia borealis 
Agropyron Richardsonii 
Agropyron caninum Hudsonian 
Pyrola asarifolia Canadian to Hudsonian 
Oryzopsis asperifolia " " " 
Zygadenus elegans " " " 
Juniperus siberica " " " 
Hierochloe odorata Hudsonian to Arctic Alpine 
Agricultural College, 
North Dakota. 
LITERATURE CITED 
I. American Ornithologists' Union Conunittee. Check list of North American birds. 
3d ed. New York, 1910. Fourth provisional zone map of North America (U, S. 
Biological Survey) as frontispiece. 
in North Dakota 
Enters Transition slightly- 
Common through Transition 
Scarcely below Canadian 
Somewhat into Transition 
In Transition locally 
Through Transition generally 
Reaches Austral limits 
Near Austral limit only 
Through Transition and Aus- 
tral farther south 
Through Transition and Aus- 
tral farther south 
Through Transition and Aus- 
tral farther south 
(Noted under "Records of 
Special Interest") 
Agrees so far as it occurs 
Mainly Canadian 
Canadian 
Well through Transition 
Canadian 
Well through Transition 
Only in southwest at Austral 
limit 
Through Transition in eastern 
N. D. 
