796 The American Naturalist. [September, 



plants are woven. It presses up close to the margin of the 

 lake, and affords a pretty sure indication as to whether it is 

 safe to venture upon the place or not. Other characteristic 

 carices are C. pauciflora, C. teretiuscula, C. magellanica, C. liviosa, 

 C. exilis and C. redowshjana. Other species of Carex, as well as 

 some species belonging to other genera in this order, are often 

 found in the bog. 



Pelfandra virginica is in the moors, but occurs as well along 

 all our streams. Calla, while perhaps not exclusively a moor 

 plant, occurs here more frequently than anywhere else. 



But a single species of the Liliacese is found, viz. : Vagnera 

 trifolia. 



In distinct contrast we find this the chosen home of our 

 rarest orchids. The representative species are : Habenaria ble- 

 phariglottis, H. daveUata, H. dilatata, H. hucophsea, Cypripedium 

 reginss, Pogonia ophioglossoides, P. verticiUata, Arethusa bidbosa, 

 GyrostaicJiy romaazojfiana, Lister a australis and Limodorum tuber- 

 osum. 



Two willows, Salix myrtiUoides and S. Candida, are exclusively 

 moor plants in this region 



Sarraceiiia purpiLrea is conR.ned to the moors, and is one of the 

 most unique in appearance and habits of moor plants. 



Drosera intermedia occurs only in the newest portions of 

 the moor, while U. rotimdifolia is more often in the drier por- 

 tions, sometimes even growing upon rotten logs-atthe margin. 



Three of the Rosaccx are conspicuous moor plants. Cornarum 

 palustre is usually upon the water's edge, and is a pretty effect- 

 ive moor builder. The other species are Geum rivale and 

 Sangvisorba canadensis, both of which are in the more mature 

 portions. 



Decodon verticillatus occurs m considerable abundance in 

 most of the lake-containing swamps, but, as is well-known, is 

 not confined to them. It is also an important moor builder. 



Two species of Epilobium are confined to the moors — E. 

 lineare and E. strictum. 



Proserpinaca pcdustris must also be included here. 



The Ericacese is one of the three most conspicuous orders in 

 the moors. The other two are the sedges and the orchids. 



