140 HARSHBERGER : PHYTO-GEOGRAPHIC SKETCH 
does not exclude sphagnum mosses from the category of swamp 
plants, but bogs which owe their character to them are absent, 
and peaty deposits such as one finds associated with the sphag- 
num are entirely wanting. The swamp plants characteristic of 
the region may be enumerated in the following list: Carex, Sci- 
pus and Cyperus, several species, Onoclea sensibilis L., Osmunda 
Crum Cree 
Fic. 4. Portion of ay iiees sly formation shown in Fig. 1. A, dark 
Zizania aquatica L,; AA een Zizania aguatica L.; B, Sagittaria a 
Willd. ; 88, Sagittaria sre Willd., a form with narrower ‘lonhees AAA, dark 
light green Zizania aquatica L., mixed; W, Salix alba L.; C, Pontederia cordata - 
vegalis L., O. Claytoniana L., O. cinnamomea L., Spathyema 
foetida (L.) Raf., Acorus Calamus L., Typha latifolia L., T. angus- 
tifolia L., Iris versicolor L., Carex squarrosa \., Veratrum viride 
Ait., Thalictrum polygamum Muhl., Impatiens biflora Walt., /. 
