OF ARTS AND SCIENCES. 187 



IX. 



NOTES ON COMPOSITE AND CHARACTERS OF CER- 

 TAIN GENERA AND SPECIES. 



By Asa Gray. 

 Read, May 12, 1874. 



This paper is a continuation and conclusion of one which was com- 

 municated to the Academy a year ago, and printed at the close of the 

 preceding (the 8th) volume of the Proceedings. It chiefly concerns 

 Californian genera, and the changes which it becomes necessary or 

 proper to make on account of the new revision of the Compositce by 

 Mr. Bentham in the second volume of Bentham and Hooker's Genera 

 Plantarum ; and it indicates a few slight corrections in that admirable 

 and arduous revision, as well as the somewhat different conclusions to 

 which I have been led in respect to the circumscription of two or three 

 genera. 



Characters of a small number of new species of other orders are 

 appended at the close. 



MADiEiE. A characteristically Californian subtribe, with one Madia 

 dispersed to Chili, and two remarkable genera in the higher region of 

 the Sandwich Islands. In the Genera Plantarum alternate leaves are 

 assigned to all our North American genera ; but the lower or lowest 

 are commonly opposite, and all but the uppermost are prevailingly so 

 in Nuttall's Anisocarpus and my Hemizonella. It was by an oversight, 

 as the context shows, that the achenia of Anisocarpus were said to be 

 obcompressed in the Flora of North America. 



Madia Molina. The reduction of Madaria DC. and Madorella, 

 Anisocarpus, Amida, Ilaipcecarpus, and some other genera of Nuttall 

 to Madia, the counterpart of what I had already done in Layia, is 



