1905] TRANSEAUBOGS OF THE HURON RIVER VALLEY 437 



myrtilloides are the most frequent plants. The accessory species 

 include Carex oligosperma, Menyanthes trifoliata, Comarum palustre, 

 Triadenum virginicum, Osmunda regalis, Onoclea sensibilis, Rumex 

 Britannica, Asclepias incarnata, Viola blanda, Cicuta bulbifera, 

 Galium Aparine, Scutellaria galericulata, Rhus Vernix, Dulichium 

 arundinaceum, Oxycoccus 

 macrocarpus, H y p n u m 

 cordifolium, Hypnum 

 Schreberi, Aulacomnium 

 palustre, and Mnium. 



V accinium-aronia society. 

 Forming a narrow tran- 

 sition society between the 

 low shrub zone just de- 

 scribed and the tree society, 

 occurs a dense line of tall 

 shrubs. The dominant 

 species are Vaccinium cor- 

 ymbosum, Gaylussacia re- 

 sinosa, Aronia nigra, Ilici- 

 oides mucronata, Betula 

 glandulosa, and Prunus 

 serotina. The other species 

 present are Acer rubrum, FlG> 8 ._p ort ion of Delhi bog. 



Sambucus pubens, Os- 

 munda cinnamomea, Salix discolor, S. Bebbiana, Spiraea salicifolia, 

 Ilex verticillata, Rosa Carolina, Sarracenia purpurea, Andromeda 

 polifolia, Calamagrostis canadensis, and Eleocharis palustris glauces- 

 cens. These shrubs border the tamaracks and to varying distances 

 extend back among them. 



Tamarack-birch society. Larix laricina and Betula lutea must 

 have made up the great bulk of the original forest which occupied 

 this area. The relative abundance of the latter has probably been 

 increased by the cutting of the tamarack. The next most important 

 tree is Acer rubrum, which occurs scattered throughout, but is espe- 

 cially abundant near the northeast side. Where isolated trees have 

 been removed, the shrubs which occur among the undergrowth have 



Stftrf* U. feet. 



