176 Rydberg : Studies ox Rocky Mountain Flora 



stout, about 2 dm. high : basal leaves oblanceolate, thick and fleshy, 

 4-6 cm. long, obtuse, crenate wifh entire long tapering bases or 

 the first subentire : stem leaves similar or reduced and linear in 

 outline : cyme corymbiform, not compact : heads about 8 mm. 

 high ; bracts linear acute, yellowish green ; the calyculate ones 

 minute and few: rays 5-6 mm. long and about 1.5 mm. wide, 

 4-nerved : achenes minutely scabrous on the angles. 



This species has also been included in S. aureus coinpactus, but 

 lacks the dense inflorescence of 5. coinpactus as here understood. 

 The stem leaves never show any indication of being pinnatifid with 

 narrow lobes as in that species. 5. coinpactus is a plant of the 

 Great Plains, while 5. oblanccolatus is a mountain plant growing 

 at an altitude of 1800-3000 m. [Plate 5, f. 9.] 



Colorado: Como, South Park, 1895, C. S. Crandall (type 

 in the herbarium of N. Y. Botanical Garden) ; El Paso County, 

 1897, A. A. & E. Gertrude Heller, JjoS ; Cottonwood Creek, 

 ]]uena Vista, 1892, C. S. SJieldoii. 



9. Senecio longipetiolatus sp. nov. 



A tall, simple, perfectly glabrous perennial, with a short erect 

 rootstock : stem strict, 3-6 dm. high, terete : basal leaves oblan- 

 ceolate, I — 1.5 dm. long, with a slend&r petiole, from serrate to 

 subentire : lower stem leaves similar ; the upper reduced, lanceo- 

 late, sessile, sharply serrate, or laciniate-dentate, often auricled at 

 the base : cyme dense, corymbiform : heads 8—9 mm. high : 

 bracts about 20, linear, acute : the calyculate ones few, minute, 

 subulate and crisp: rays dark orange, 4-7 mm. long and 1.5 mm. 

 wide, 3-4-nerved : achenes strongly angled, glabrous. 



In the type the basal leaves are strongly serrate, but in the 

 Colorado plants they are indistinctly so or subentire. Baker, 

 Earle & Tracy's specimens were named by Professor Greene, 

 Senecio crocatus Rydb. but it is entirely distinct from anything 

 collected by Hall & Harbour, and has nothing that fits any de- 

 scription of S. aureus var. croceus, except the dark rays. See 

 further remarks under ^\ crocatus. S. longipetiolatus grows at 

 an altitude of 2000-3000 m. [Plate 6, f. 10, loa.] 



Wy'OMINg : Spread Creek, Teton Forest Reserve, 1897, /^ 

 Tiveedy, j8^ (type in the herbarium of N. Y. Botanical Garden). 



Colorado : Medicine Bow Range, 1891, C. S. Crandall ; Ha- 

 mor's Lake, north of Durango, 189S, Baker, Earle & Tracy, 62 j. 



