362 GERTRUDE P. NORTON 



Myriophyllum verticillatum L. 

 Ranunculus aquatilis var. capillaceus. 

 Ranunculus aquatilis var. caespitosus. 

 Mentha canadensis L. 



Lysichiton kamtschatcensis Schott. grows in the dark willow 

 thicket at the back of the swamp. 

 At Poison swamp were noted: 



Potentilla palustris L. Scop. 



Menyanthes trifoliata L. 



Acorus calamus L. 



Allium schoenoprasum Wats. 



Gratiola virginiana Benth. 



Typha latifolia L. 



Hypericum canadense var. boreale Britton. 



Carex conjuncta Boott. 



Juncus acuminatus Mx. 



Scirpus microcarpus Presl. 



Juncus balticus var. littoralis Eng. 



Hippuris vulgaris L. 



B. The delta swamp succession 



Where the Flathead River enters the lake it has formed a long 

 delta of sand and river silt. For a little distance the sandy points 

 are destitute of vegetation, then the sandbar willow, Salix flu- 

 viatilis appears. The pioneer plants on the delta sand are about 

 the same as those found on the stony beaches; when a layer of 

 soil has been formed the shrubs come in, such as service-berry, 

 choke-cherry, roses, ninebark and willows of several kinds. Where 

 the delta is high enough there is a good growth of cottonwood, 

 hawthorne, quaking asp and birch. From the mountain top the 

 delta looks like a long tongue of trees reaching out into the lake. 

 It furnishes an excellent example of the filling-in process. 



Salt Lake City, Utah. 



