168 



PITTONIA. 



rait, slender tlirougliout, but rather rigid, about a foot high, 

 scabro-puberalent : radical leaves (dead and gone at flower- 

 mg^ tima) oblong-lauceolate, scarcely an inch long, obtuse, 

 entire with a few prominent teeth, short-petiolate ; cauline 

 narrowly linear, entire, sessile : heads 2 or 3 lines high : 

 rays very numerous and slender, rather short : pappus 

 double ; the outer of 5 to 8 setosely fimbriate scales ; inner 

 of as many slender bristles. 



This is n. 1275 of Mr. Pringle's Chiliuahua collection of 

 the year 1887, distributed as E. diver gens. It is every way 

 more like E. BellkUastrum,and clearly enough distinct from 

 both. The outer pappus is almost or quite that of Achccfo- 

 !}eron; the pappus-scales, if I mistake not, are more or less 

 united at base, as in that too artificial genus. 



IE the bristles of the inner pappus had been wanting in 

 the last named species, it would have been an Achwlogeron. 

 The several species already admitted under that generic name 

 are diverse in habit, each falling readily into some group of 

 true Erigeron. In this genus I am persuaded they all 

 naturally belong. They will there take names as follows : 



Erigeron, Wislizeni. Achtelogeron Wislizeni, Grav, PI. 

 Fendl. 72 (1819). Closely resembling E. pumilus. 



Erigeron Seemannii. Polyactidium Seemannu, Schz. Bip.; 

 hot Herald. 301 (1857). AcJuTdogeron Seemannii, Gray; 

 Hemsl Centr.-Am. ii. 120 (1881). Very intimately related to 

 E. delphimfohus; and not only is the coroniform pappus 

 here extremely reduced, but there are two or three conspicu- 

 ous inner-pappus bristles. How, then, Dr. Gray could insist 

 on placing this as an Achcetogoron, I am unable to conceive. 



Erigeron Galeottii. Achwlogeron Galeotlii, Gray; Ilemsl. 

 Bot. Centr.-Am. ii. 119 (1881). The published character of 

 tins species is insufficient to enable one to say where, under 

 i^ngeron, it should stand. It is said to be leafy-stemmed 



