^ ° PITTOXIA. 



Colorado mountains, is but a dwarf state of tliis witL flowers 

 more rose than yellow; but all transitional shades occur; 

 and It belongs to the whole genus to have either yellow- 

 flowers disposed to turn rose-red, in drying, or saifron-colored 

 ones fading to a like shade under the same process. 



In all the foregoing the crown of the root is simple, or 

 nearly so, with the leaves scattered equably on all sides of it. 



In the first which follows, there is a totally different phyllo- 

 taxis. 



ill 



Troximon PAiiYiFLORUM, Nutt. Trans. Am. Phil. Soc. vii. 

 434 (1841 ) ; T. & G. Fl. ii. 490. T. ulaucum, var. pan 

 Gray, Syn. FI. 437. 



Caudex raulticipitous, the narrowly linear or broader and 

 lanceolate leaves strictly 2-ranked, thus subtending the more 

 or less decumbent scapes: whole plant nearly or quite 

 glabrous : bracts of the involucre nearly equal, all lanceolate- 

 acuminate : heads and achenes much shorter than in the last, 

 the latter almost beakless ; pappus less flaccid and more 

 nearly approaching the deciduous. 



I collected this last July on the Laramie plainswliere it is 

 abundant and the only species; noting at the time the excel- 

 lent vegetative characters, which the lierbarium specimens 

 also show. About Laramie the leaves of the plant are 

 thorougldy grassy in their extreme narrowness and immunity 

 from all indentation of margin. At lower elevations and 

 further westward they are broader, shorter and often toothed ; 

 bat by the important characters above noted the species is 

 perfectly valid and one of the best. 



Troxijiox Arizoxicum. About a foot high, slender, glabrous 

 except a woolliness under the involucre: leaves narrowly 

 otlanceolate, entire or runcinately toothed : head more than 

 au inch high, few-flowered, more than an inch broad when 

 expanded ; involucral scales in two series, the outer oblong, 

 the inner lanceolate, all purple in the middle : ligules light 



