17* AN INTRODUCTION 



MONSTROUS flowers, such as the rnulti plicate, full, 

 or proliferous, derive their origin from natural ones, 

 and therefore are to be considered only as a variety 

 from luxuriance. 



Upon the whole, the change of soil is found to 

 have a great effect on the nature of plants; and to 

 this many of the varieties above-mentioned must be 

 imputed ; as in Buxus, Xanthium, Acanthus, Cinara, 

 Prunella, Myosotis, CYista galli and Cerinthe*; 

 which would ail return to their old conditions if the 

 soil were changed again. And in like manner the 

 improvements which are made by culture in the 

 plants cultivated for sale, as in Yitis, Malum, Pyrus, 

 Amygdalus, Persica, Asparagus, Cerasus; and in 

 grain, pulse, and fruit of all kinds are not to be 

 esteemed as lasting : for all these, if left to themselves 

 in a poor soil, would run off again, and resume the 

 qualifies they had when they grew wild. 



The soil has some effect also upon the leaves ; for 

 though it is less common for the leaves to differ on 

 the same plant, as they do in some species of Lepi- 

 dium, Tithytnalus, Rudbeckia, and Hibiscus f ; yet 



Sambucus laciniato folio (C. B.) 

 laciniatis foliis (C. 13.) 



Valeriana sylvestris foliis tenuissime divisis (F. B.) 

 * Baxus arboresccns (C. B.) Buxus humilis (Dod.) 

 Xanthium (Dod.) Xanthiura Canadense inajtis (Tourn.) 

 Acanthus mollis (C. B.) Acanthus aculeatus (C. B.) 

 Cinara acuhata (C. B.) Cinara non aculeata (C. B.) 

 Brnnella (Dod.) Brunella caeruleo inagno flore (C. B.) 

 Myosotis foliis hirsutis (H. C.) et foliis glabris (H. C.) 

 Crista galli faemina (J. B.) et mas: (J. B.) 

 Cerinthe flore ex rubro purpurascente (C. B.) et flaro 



flore asperior (C. B.) 



f Tithymalus heterophyllus (Plum: Pluk: Aim: 112: f. 6.) 

 Rudbeckia foliis inferioribus trilobis, superioribus indi- 



Tisis (Hort. Upsal.) 

 Hibiscus foliis inferioribus integris, superioribus trilobis. 



(Hort. Cliff.) 



SLepidium foliis cauliiiis pinnato-muUifidis ; ramis cordatis 

 amplexicaulibus integris (H. C.) 



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