PLATE XIX.* 



1. DAHLIA PINNATA. 



PURPLE DAHLIA. 



2. DAHLIA CROCATA. 



YELLOW DAHLIA. 



THIS genus was established by the late Cavanilles, in honour of 

 Dr. Andrew Dahl, a Swedish botanist, and the friend of Baron 

 Alstrcemer. 



It belongs to the class and order Syngenesia Polygamia Frustranea, 

 at least in this cold climate. 



The stems die every winter, but the root is perennial and tube- 

 rous, not very dissimilar to that of the Artichoke. 



Four species have been described. 



1. Pinnata, pinnated as it is called, and figured by Cavanilles in 

 his Ic. PL v. 1. tab. 80. It is also figured under this name in the 4ih 

 vol. of Andrews's Bot. Repository. In the Annales dit Mas. National 

 Hist. Nat. v. 3. M. Thouin calls this species Purpwea, but its colour 

 varies from the common Pinnata, being very deep; and Mr. R. A. 

 Salisbury suspects that this Purpurea of Thouin is the true Rosea of 

 Cavanilles. A paler coloured variety of ihePinnata, the seeds of which 

 were sent to Holland-House with the name of Rosea by Cavanilles, 

 has been lately figured by Mr. Hooker in the Puradisus Londinensis, 

 and described by the above-mentioned botanist, under the name of 

 Sambucifolia: that it is not the true Rosea of C.ivanilles, Ic. is un- 

 questionable; for the leaves were simply pinnate, not bipinnate. 



2. Rosea, Rose-coloured. It is so called and figured by Cava- 



