448 xMEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



In shady damp places, up to an altitude of 2000 m. 

 Montana: Little Rocky Mts., 1889, V. Havard. 



* Senecio glauciifolius. 



Tall and slender, 5-6 dm. high, glabrate or slightly tomentose 

 when young ; basal leaves elliptic, coarsely sinuate-lobed, generally 

 with smaller lobes on the petiole, which is somewhat enlarged and 

 clasping at the base; stem-leaves ovate or rounded-ovate, sessile or 

 half-clasping, deeply cleft into oblong divergent lobes ; heads in a 

 more or less compound corymb, about i cm. high ; involucral 

 bracts very narrowly linear, almost subulate: rays ver}^ narrow^ 

 light yellow; achenes brown, striate, scarcely half as long as the 

 white pappus. 



Evidently nearest related to S. ercmophilus and S. ClarkiannSy 

 but has much less divided leaves, the lower of which resemble 

 most those of S. Bahamitac, but the upper are much broader. From 

 all these it differs in the very narrow bracts. 



Montana : Columbia Falls, Mrs. J. J. Kennedy, j6. 



* Senecio vulgaris L. Sp. PI. 867 [111. Fl. 3: 482]. 



An introduced annual with pinnatifid leaves, small many-bracteo- 

 late heads, and narrowly linear black-tipped bracts. The specimens 

 seen from Montana resemble those from California and differ from 

 the common European and Eastern form in being simple and hav- 

 ing narrower leaves. 



Montana: Willow Creek, Gallatin Co., 1883, Scribner, i2jc. 



*Carduus arvensis (L.) Robs. Brit. Fl. 163 [111. Fl. 3: 489] ; Ser- 



ratula arvensis L. Sp. PI. 820 ; Cniciis arvensis Hoffm. Deutschl. 



Fl. Ed. 2, I-: 130 [Syn. Fl. i" : 398]. 



The so-called "Canada Thistle," an introduced species from 

 Europe, is found occasionally on railroad banks and roadsides. It is 

 recognized by its small heads of dark red dioecious heads and green 

 herbage. 



Montana: Logan, 1895, Rydberg, 28^^. 



* Carduus Hookerianus (Nutt.) Heller, Cat. N. Am. PI. 7 ; Cirsitim 



Hookerianuni Nutt. Trans. Am. Phil. Soc. (II.) 7: 418; Cnicus 

 Hookerianns Gray, Proc. Am. Acad. 10: 46 [Syn. Fl. i" : 399]. 

 In habit slightly resembling C. Parry i, the inner bracts, however, 



are not fimbriate, but all narrow and somewhat arachnoid-woolly ; 



leaves more deeply lobed and white-tomentose beneath. It grows at 



an altitude of about 2000 m. 



