ArPENDIX. l.")? 



being natural deviations by seedlings assuming 

 peculiar forms, in the woods and wilds, as it is 

 done constantly in our fields and gardens by the 

 cultivated trees and plants. Those best known 

 afford most of our noticed varieties or specific 

 deviations ; but it is only our ignorance or ne- 

 glect that prevents us from ascertaining in others 

 all consimilar varieties. One of the great aim 

 of accurate Botany is now to fix the typical and 

 prototype species of each Genus; our subgenera 

 are mostly such, when not based on floral dispa- 

 raties. When thus based they become real 

 Genera ; whose specific deviations should be 

 traced. 



I have detached from this Sylva, 3 parts of it 

 that would have swollen it beyond my limits,and 

 they are printed separately. 



1. The revised pr new kinds of Oaks, Wil- 

 lows, Poplars, Ashtrees, Hickories, Waxtrees, 

 and other akin or related Genera, chiefly from 

 North America. 



2. The Pomona of North America or the na- 

 tive fruit trees and shrubs of the United States, 

 greatly increased and revised, including the 

 Plumbs, Cherries, Vacciniums, Rubus, Ribes, 

 Vitis, and other Genera of esculent fruits. Of 

 Vitis and Morus besides Roses. I have published 

 separate monographs. 



3. My Erikon or account and figures of Eri- 

 cas, Andromedas and akin Genera, with the Di- 

 osmas, Phylicas and other Ericoid shrubs. 



To complete this labor I must now add the 

 corrections and additions that have been sugges- 

 ted in the progress of it, and afterwards 3 im- 

 portant indexes — 1. That of other N. G. of trees 

 and shrubs described in my Flora Telluriana 

 and New Flora — 2d. The Index of the Natural 



