VARIATION OF COLOUR IN WILD PLANTS. 326 



EQUISETACE^. 



Equisetum arveme. Meadows, by the side of the Gipping, common. 



palustre. Moist and boggy places, frequently. 



Jiuviatile. Moist meadows, occasionally. 



limosum. Ditches, common. 



ACROGENS, ACOTYLEDONOUS, or CR7PT0GAMIC PLANTS, 



POLYPODIACE^. 



PoLYPODiuM vulgare. Road-sides and woods, common. 

 AspiDiUM cristatum. ) t> v xt. 



spinulomm. P^^^^ ^^^^^'^ ^°«^"^^"- 



aculeatum. Road-sides, rare. 



angulare. Road-sides, occasionally. 



Filix-mas. Road-sides, woods, &c., common. 



Filix-fetnina. Moist woods, local. 



AsPLENiuM Adiantum-nigrum. Woods, local. 

 ScoLOPENDRiuM vulgarc. Road-sides, local. 

 Pteris aquilina. Heaths, very common. 

 Blechnum boreale. Woods, local and scarce. 



OPHIOGLOSSACE^. 



Ophioglossum vulgatum. Meadows, local. 



CHARACE.E. 



Chara vulgaris. Boggy pools and ditches, common. 



Art. III. — On the Variation of Colour in Wild Plants. 

 By Arthur Adams, Esq. 



Varieties among the plants cultivated in our gardens, where 

 they are exposed to every unnatural influence which the in- 

 genuity of man has invented, to divert them from their usual 

 mode of growth, have received all the attention so wonderful 

 and interesting a subject demanded at the hands of the culti- 

 vators of Botany. But even among those lovely productions 

 whose only nurse is the gentle Flora, we occasionally meet 

 with aberrations from the normal structure, departures from 

 the laws that ordinarily govern the world of vegetables. Of 

 these, the most numerous are alterations in the colouring of 

 the floral envelopes, and deseiTe our consideration. 



The causes which give rise to, and modify the production of 



