composite. 349 



16. CHRYSOPSIS, Nutt. 

 1. Chrysopsis yillosa, Nutt. 

 Hab. On the Kooskooskee, Willamette, &c. ; in various forms. 



2. Chrysopsis sessiliflora, Nutt. 



Hab. California, on the lower Sacramento, near San Francisco, &c. 

 with the var. echioides (C echioides, Benth.), or a form near it. 



17. BACCHARIS, Linn. 



1. Baccharis consanguinea, DC. 



Hab. Bay of San Francisco, and lower part of the Sacramento 

 River, California.— B. pilularis, DC., is a form of the same species, 

 and should, perhaps, give the name to be adopted. 



2. Baccharis Douglasii, DC. 

 Hab. California ; with the preceding. — The receptacle is conical. 



18. PLUCHEA, Cass. 

 1. Pluchea camphorata, DC, Torr. & Gray. 



Hab. Bay of San Francisco, California. — A single specimen, ap- 

 parently of the species of the Atlantic Coast. As it has not been re- 

 ceived from any other collector, we suspect the seeds may have been 

 carried in ballast from New York or Boston. [Again and recently 

 collected by Dr. Bolander. As it occurs in Southern Nevada and 

 Arizona it is probably indigenous.] 



