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On the Characters and Affinities of certain Genera, chiefly he- 

 longing to the Flora Peruviana. By Mr David Don, 

 Librarian of the Linnean Society ; Member of the Impe- 

 rial Academy Naturae Curiosorum ; of the Royal Bota- 

 nical Society of Ratisbon ; and of the Wernerian Society 

 of Edinburgh, &c. (Continued from p. 228. of former 

 Volume) 



MOLINA INCANA and FERRUGINEA. 



JL hese are the Baccharis thyoides of Lamarck, and B.Jvrru- 

 ginea of Persoon, which form a very distinct genus, having no 

 particular affinity with Baccharis or Molina, except what might 

 be expected between plants of the same natural class. Perhaps 

 the Conyza hryoides and ciqwessiformis of Lamarck may also 

 be referable to it ; but I have not had an opportunity of exa- 

 mining them, to determine this point. The Tqfalla of Ruiz 

 and Pavon proving the same Avith the Hedyosmum of Swartz 

 and Willdenow, and no other genus having yet supplied the 

 place of the former in the annals of botany, I have availed my- 

 self of the opportunity which this circumstance has afforded, 

 of commemorating the labours of Don Juan Tafalla, a distin- 

 guished pupil of Ruiz, and his zealous assistant and successor 

 in the investigation of the Peruvian Flora. The genus had 

 been named, and its essential characters determined, by me seve- 

 ral years ago, when engaged drawing up an account of the South 

 American Composite, contained in the Lambertian Herbarium. 



The points which essentially distinguish Tqfalla from Bac- 

 charis, are the inclosed stamina, and the anthers being furnished 

 with two bristles at their base, — characters which it has in com- 

 mon with the rest of its tribe, but especially with Antennaria, 

 from which it is principally distinguished by the peculiarity of 

 its habit. 



Most botanists, and it is believed also M. Cassini himself, have 

 referred Baccharis to Asterete, but they assuredly belong to the 

 Eupatorcrey and to that portion of them that conies under Ver- 

 noneoe, where their habit corresponds better, and in which the 

 stamina are also most frequently exserted, particularly in Va- 

 niUosma, a genus which may be regarded as establishing a con- 



