VEGETATION OF FLATHEAD LAKE 361 



Sagittaria afifolia Nutt. covers the mud flats at the mouth 

 of Swan River. At Lakin's Point was found Dodecatheon meadia 

 var. pauciflorum and Spiranthes romanzoffiana. On the shore of 

 the river below the old club house Isoetes Howellii was fairly 

 abundant. 



A . Swamp meadow succession 



The swamps and meadows at the head of the lake, in the bays 

 on the west side, and at the foot of the lake, include very many 

 plants of the foregoing lists. The meadows are submerged at 

 high water and in addition to the meadow grasses have several 

 species of swamp grasses, rushes and sedges. 



On August 7 the following were noted in the swamp west of 

 the islands: 



Carex vesicaria L. 

 Juncus balticus Willd. 

 Eleocharis palustris (L) R & S. 

 Glyceria sp. 

 Scirpus lacustris L. 

 Cardamine spp. 



Ilysanthes dubia (L.) Barnhart. 

 Mimulus langsdorfii Donn. 

 Ranunculus unalaschensis Bess. 



Here there were large trees of quaking asp and the willows 

 formed clumps on the north side of the meadow. The common 

 willows are: 



Salix scouleriana Barratt. 



Salix lasiandra Beuth. 



Salix cordata var. mackenziana Barratt. 



Salix rostrata Rich. 



Salix fluviatilis Nutt. 



These swamp plants were found near the mouth of Swan River. 



Sium cicutaefolium Gmel. 

 Alisma planlago L. 

 Sagittaria arifolia Nutt. 

 Equisetum fluviatile L. 

 Sparganium androcladum Eng. 

 Triglochin maritima L. 

 Scutellaria galericulata L. 



THE PLANT WORLK, VOL. 22, NO. 12 



