47 



in this latter class is accounted for by the fact that Au- 

 burn, where the greater part of the collecting was done, 

 is on the extreme southern border of the metamorphic 

 Kegion. In fact the more sandy lands of the central 

 pine belt extend ^t one ix)int to within half a mile of the 

 College building. All the plants collected in the neigh- 

 borhood of Auburn have been included in the list 

 whet-ier thev were taken from one side or the other of 

 this rather vaguely defined line. While most of the 

 plants that are marked with the double dagger are un- 

 doubtedly characteristic of the central pine belt rather 

 than of the metamorphic hills; still it is probable that 

 almost or quite all of them are to be found at some point 

 on the more sandy lands that are clearly within this re- 

 gion proper. 



The ecological relations of the flora have not in all 

 cases been critically studied. The topographical features 

 of the country will, of course, limit the plant societies 

 or formations. The following situations have each a 

 more or less clearlv marked flora, and the brief 

 note on habitat following each species in the list 

 will, in most cases, indicate the nature of the locality 

 where the plant should be sought. Beginning with the 

 hydrophytes we may distinguish, first, the plants of the 

 rapidly moving streams with which the region is abund- 

 antly supplied. Second, plants of pools and pond-s. Ponds 

 are not frequent, those found being mostly artificial. 

 Third, marsh plants, inhabiting certain open miry 

 places, and the open boggy banks of streams. Such 

 areas are restricted and rather infrequent, but certain 

 plants are found only in such localities. Fourth, swamp 

 plants of the poorly drained timbered land along 

 streams. In clay land there are likely to be '^alder 

 swamps," the prevailing growth being alder (Aliiux ru- 



