42 MISSOURI BOTANICAL GARDEN. 
mogeton natans, Vallisneria spiralis, Naias flexilis and 
species of Ceratophyllum and Myriophyllum are abundant. 
The narrower portions of the water way, which extends 
umost to Petoskey, are kept pretty well cleared of aquatic: 
vegetation by small steamers and lumber rafts. It is likely 
that the artificial maintenance of the water at near its pres- 
sent level will retard the natural process of filling this area 
and consequently alter the succession of floral types. 
At the outlet of Walloon Lake near Petoskey, the chan- 
nel is more definite, the stream is more rapid and the flora 
is more particularly that of areal land margin, the forms 
being generally such as are found in a very moist woods. 
The appended list shows the nature of the flora in the 
Walloon River area. 
Acer rubrum. Leersia oryzoides. 
Aralia nudicaulis. Lonicera glauca. 
Aralia racemosa. Ludwigia palustris. 
Aspidium thelypteris. Lycopus Virginicus. 
Apocynum androsaemifolium. Mentha Canadensis. 
Bidens connata. Menyanthes trifoliata, 
Caltha palustris. Myrica Gale. 
Campanula aparinoides. Plantago major. 
Cicuta bulbifera. Rhus Toxicodendron. 
Conocephalus conicus. Rosa Carolina. 
Dalibarda repens. Rubus triflorus. 
Equisetum arvense. Rumex verticillatus. 
Equisetum limosum, Salix lucida. 
Galium asprellum. Solanum Dulcamara. 
Galium triflorum. Solidago patula. 
Gaultheria procumbens, Thalictrum purpurascens. 
Gentiana Andrewsii. Trientalis Americana. 
Hydrocotyle Americana, Ulmus Americana. 
Lathyrus palustris. Viola blanda, 
2. UNDRAINED SWAMP. 
The undrained tamarack and black spruce swamp is typi- 
cally represented on the island of North Manitou. Here is 
a small decadent lake without an outlet which is gradually 
being filled up by the encroaching vegetation. (Plates 3, 
4, and 5.) 
