BOTANICAL GEOGRAPHY. 29 



KflsofSf«ri^rr?^K"?'>'i^^^^ *'«"« °f ^^^ river Potomac.-ll. 



l^r^ntin^rnXJ.^r^^^'^^^^^^ °^e««^ Kentucky -12. The 



^i1?eXl mrnnf^^^'r l^"i^n^«''y^^^^ The WiconiBcof Tuscarora 



SLs in MaiTnd iT'^'^i^^^^ ^^^ ^"'"niit of the Allegha- 



IVfoVru- u^^"^-"-^^- The Cacapon mountains of Virginia— 16. The orai- 

 of Ken^ufkv"o? KnTl^u''''''';l'l.''- Jhe Was.oto finu and mou^,^?^ 

 WoK i! X' °/ /""'' ^'l^^' ^'^^ ^h^'f knoblicks.— 18. The banks of the 

 ^ Cumwilli^fnS t"'^""™-^^- The neck of land between the mouth, 

 and Tennessee ^Th. 1f"''''r "7•^^^'•^h the glades of South Kentucky 

 ana i ennessee— The shores of Lake Erie near Sandusky. ' 



I hardly need add the far famed fall of Nia- 

 gara, the head and falls of the Hudson, the Ta- 

 conick and Mattawan mountains, and in fact 

 every ridge of the Alleghanies. They are all 

 interesting botanical spots to visit; but in or- 

 der to detect all their plants, you must visit 

 them at least three times, in the Spring, Sum- 

 mer and Fall, or every month from May to Oc- 

 tober, and even some plants of short floral du- 

 ration may then escape you. How can we then 

 hope to know all our productions, except gra- 

 dually and by repeated explorations. I have 

 never been able to meet the Hamiltonia, nor 

 Centunculus, nor Parnassia in full bloom, and 

 many rare plants were only found once by me 

 during 24 years of exploration. 



It is 1 mistake to imagine that all our plants 

 are s- ivan or nemorose, because forests abound 

 in our Continent, The plants growing under- 

 neath the shade of trees are not even the major 

 number, and we must look for many in mea- 

 dows, glades, fields, swamps, sea shores, banks 

 of rivers, brakes, (these are pecuUar places in 

 woods or glades where ferns, canes or grasses 

 prevail,) salt licks, rocky hills and cliffs, moun- 

 tains tops, near springs and brooks. 



The distribution of the plants in these loca- 

 lities, and the distribution of peculiar tribes 



