may lead to either a grassland or a forest. Only seed plants and ferns 

 are included in the following lists which are classified to indicate the 

 (i) submerged, (2) floating-leaved, and (3) emergent aquatics, the 

 (4) reed, and the (5) sedge swamp associations. Subsequent stages in 

 the successions are given under the prairie, peat bog, and flood plain 

 associations. Among the many localities in which aquatic vegetation 

 is to be found some of the best are at Miller, Long Lake, Pine, Wolf, and 

 Calumet lakes, Ind., Skokie Marsh and Fox Lake, 111. 



Shrubs 



(3) Salix amygdaloides Anders., peach-leaved willow. 



(3) " cordata Muhl., heart-leaved willow. 



(3) " glaucophylla Bebb, glaucous willow. 



(3) " longifoUa Muhl., sand-bar willow. 



(3) " discolor Muhl., glaucous willow. 



(3) Cephalantkus occidentalis L., buttonbush. 



Herbaceous Plants 



(5) Selaginella apus Spreng., marsh selaginella. 



(3) Equisetum variegatum Schleich., variegated horsetail. 



(3) Equiseium fluviatile L., swamp horsetail. 

 (4*) Typha latifolia L., common cat-tail. 

 (4*) " angustifolia L., narrow-leafed cat-tail. 

 (3*) Sparganium eurycarpum Engelm., bur-reed. 

 (2*) Potamogeton natans L., pondweed. 



(2) " americanus C. & S., American pondweed. 



(2) " amplif alius Tuckerm., broad-leaved pondweed. 

 (i*) " crispus L., crisp pondweed. 



(i) " lucens L., shining pondweed. 



(i*) " zosterif alius Schu., grass-leaved pondweed. 



(i*) " pectinatus L., narrow-leaved pondweed. 



(i) " Rabbinsii Oakes, Robbin's pondweed. 



(i) Zannichellia palustris L., horned pondweed. 



(i*) Najas flexilis R. & S., naiad. 



(4) Triglochin maritima L., arrow grass. 

 (3*) Sagittaria latifolia Willd., arrow-head. 



(3) " heteraphylla Pursh, arrowweed. 

 (3) " graminea Michx., narrow arrow-head. 

 (3) Alisma plantago-aquatica L., water plantain. 



(i*) Elodea canadensis Michx., water-weed. 

 /Xi) Vallisneria spiralis L., tape grass. 

 (t,, 5) Calamagrostis canadensis Beauv., blue-joint grass. 

 J (4*) Phragmites communis Trin., reed. 



(5) Spartina Michauxiana Hitch., cord grass. 

 (3) Zizania aquatica L,, wild rice. 

 (3) Eleocharis palustris R. & S., spike rush. 



(3, 5) " tenuis Schultes, spike rush. 



16 



