Rydberg : Rocky Mountain flora 543 



beneath; heads few, ending the stem and short branches, sub- 

 tended by narrowly Hnear spinulose-ciliate leaves, hemispheric, 

 about 4 cm. high, 4-5 cm. wide; outer bracts lanceolate, brownish, 

 glabrous or nearly so, ending in short weak spines 2-3 mm. long, 

 the innermost linear-lanceolate, attenuate, ending in slender 

 brownish or purplish somewhat twisted and spreading lance- 

 linear tips, these neither dilated nor erose; corollas pinkish; pap- 

 pus plumose; tips more or less clavate. 



This species resembles Card mis Kelseyi and C. foliosiis in the 

 leaves, but differs from both in the scattered few heads and purplish 

 stem. In both species mentioned, the heads are conglomerate at 

 the end of the stem. In Carduus Kelseyi the involucral bracts 

 are much narrower and decidedly arachnoid. In C. folios us the 

 bracts are somewhat broader than in C. Butleri, the inner ones 

 have dilated, lanceolate and erose tips, and the leaves are usually 

 more lobed. 



Montana: Big Fork, July 28, 1908, B. T. Butler, 674 (type, 

 in herb. N. Y. Bot. Gard.) ; also near Rost Lake, dy/. 



Carduus lacerus sp. nov. 



Probably biennial; stem stout, 6-10 dm. high, sparingly arach- 

 noid, angled and striate; lower leaves oblanceolate, 2-3 dm. long, 

 pinnatifid, with rather broad, ovate or lanceolate divisions ending 

 in weak spines, glabrous or slightly long-hairy and green above, 

 grayish tomentose beneath; upper leaves lanceolate, sessile and 

 clasping, with somewhat narrower lobes and rather stout spines; 

 heads more or less clustered, about 4 cm. high and broad; outer 

 bracts ovate-lanceolate, glabrous, without glutinous ridge, ending 

 in short stout spreading spines 3-5 mm. long; inner bracts with 

 dilated, ovate, abruptly acuminate, erose and crisp, spreading 

 tips; corollas rose-colored; pappus plumose; tips slightly clavate. 



This species was probably included in Cnicus scariosus by 

 Gray, judging from his description in the Synoptical Flora; but 

 it is not Cirsiuni scariosum Nutt., for Nuttall characterized the 

 latter as having arachnoid-hairy involucres, the bracts with dilated 

 erose tips, and the leaves tomentose beneath. I know of only 

 one species which agrees with this characterization. This is well 

 represented by Flodman 880, which was distributed as Carduus 

 Hookerianus. 



Utah: Wahsatch County, near Midway, July 6, 1905, Carlton 



