Rydberg : Studies on Rocky Mountain Flora 183 



20. Senecio nephrophyllus R\'dberg, Mem. N. Y. Bot. Garden, 



I : 446. 1900 



Related to the two preceding, but characterized by the ray- 

 less heads, the reniform first basal leaves which resemble those 

 of Oxyria digyna, and the pinnatifid stem leaves with their oblong 

 blunt segments. The Colorado specimens are much lower than 

 the type, being about 2 dm. high. [Plate 6, f. 15. J 



Montana : Big Blackfoot River, 1883, Canby, 20j. 



Colorado: South Park, 1872, T. C. Porter; Middle Park, 

 Hall & Harbour, jj2, in part. 



2 1 . Senecio Idahoensis sp. nov. 



Stout perennial, in age glabrate or slightly floccose at the 

 base of the leaves : stem 4-5 dm. high, branched, striate, tinged 

 with purplish : basal leaves obovate, serrate : lower stem leaves 

 oblanceolate in outline, about i dm. long, petioled ; the upper 

 ovate or lanceolate in outline, sessile and auricled at the base ; all 

 bluish-green, pinnately divided into oblong or oblique-cuneate in- 

 cised segments : heads numerous, about i cm. high ; bracts about 

 25, very narrowly linear, equaling the disk : rays none : achenes 

 striate, glabrous. 



A species somewhat related to 5. aureus, but characterized 

 by its broad and laciniate leaves, rayless heads and numerous very 

 narrow bracts. [Plate 6, f 5.] 



Idaho : Granite Station, 1892, Sanelberg, McDougal & Heller, 

 80J (type in the N. Y. Botanical Garden herbarium). 



22. Senecio pauciflorus Pursh, Fl. Am. Sept. 529. 1814 

 This species, characterized by its few (2-6) rayless heads, linear 

 purple tinged bracts, equaling the disk in length, and its small 

 rounded-oval crenate basal leaves, has been collected several 

 times in Labrador ; but exactly similar specimens are in the 

 Torrey herbarium and were collected by Burke in the Rocky 

 Mountains, but the locaHty is not given. [Plate 5, f 3.] 



23. Senecio fedifolius sp. nov. 



A delicate glabrous perennial with a very ^hort caudex and a 

 clump of fibrous roots: stem slender, weak, about 1.5 dm high: 

 basal leaves 3-5 cm. long with a slender petiole ; blade 1-2 cm. 

 long, rounded-ovate or broadly oval, wavy or subentire : stem 



