648 PROCEEDINGS OF THE AMERICAN ACADEMY 



species were not unnaturally associated with Aster ( Oxytripolium) lini- 

 folius, or rather subidatus. 



Of the other species referred to the genus, I have had only B. 

 robusta Benth. and the figure of B. menthodora to examine. The. former 

 is more conyzoid in the involucre, as well as in the small number of 

 hermaphrodite flowers, has broad and obtuse style-appendages (as those 

 of B. menthodora are represented), broader and flat achenia with promi- 

 nent marginal ribs, and a pappus of two distinct sorts of bristles, those 

 of the outer set not longer than the width of the achenium. 



Boltonia L'Her. is made by Bentham to include my Dichceto- 

 phora ; but the Californian species referred to it (p. 209) proves to be 

 Perityle Acmelld of PI. Fendl. 



Erigeron Linn, is maintained in the wide sense to which we are 

 here accustomed. For our section Stenactis, Nuttall's name Phcenac- 

 tis is preferred, because Cassini's name was misapplied by Nees and by 

 De Candolle, and both the original Stenactis (Polyactis Less.) and the 

 leading one of Nees and De Candolle fall into Phalacroloma. That 

 leaves the name free for the employment that was made of it ; yet it is 

 right and clearer to keep up Nuttall's sectional name. But the section 

 itself does not very well hold out. As to Woodvillcea, the conjecture 

 that it is E. glaucum was long ago positively confirmed. 



E. armeri^efolium Turcz., in an authentic Siberian specimen ex- 

 amined, wholly wants the internal filiform pistillate flowers (De Can- 

 dolle's and Turczaninow's remark which implies the contrary notwith- 

 standing) ; and to it clearly belongs E. glabratum var. minor Hook, (a 

 large form of which must be E. lonchophyllum Hook.), and E. racemo- 

 sum Nutr., at least in part, — a species which is not uncommon in the 

 Colorado Rocky Mountains and the Sierra Nevada. Hall and Har- 

 bour's 232 is a large form of it. 



E. Bellidiastrum Nutt. Some careless determinations of mine, 

 confounding this with the very similar E. divergens, have misled Pro- 

 fessor Eaton into altering the character of the species by assigning to 

 it the double pappus of the latter. It has a simple and wholly decidu- 

 ous pappus, and its achenium is tipped with a broad and white epigy- 

 nous disk. Hall and Harbour's 246, Hall's Oregon 249, and the E. 

 Bellidiastrum of Bot. King, p. 150, all belong to E. divergens. Besides 

 the pappus, the receptacle in the more northern specimens of E. diver- 

 gens is strongly convex. It is less or slightly so in some forms, espe- 

 cially in E. cinereum Gray, PI. Fendl., which on the whole I cannot 



