170 RvDBERG : Studies ox Rocky Mountain Flora 



the very first, pinnately divided : heads rather small and minutely 

 calyculate. In habit resembling the Aurei and Tomentosi, to 

 which the last two form a transition, but have more divided leaves 

 and a root of less duration. 



Leaves thin ; root annual or biennial. 



Head about l cm. high ; tenninal segments of the basal leaves 3-5 cm. wide. 



1. S. sangiiisorboides. 

 Head 5-8 mm. high ; terminal segments of the basal leaves less than 2 cm. wide. 



Basal leaves with few segments ; segments crenate or dentate. 



2. S. Greggii. 

 Basal leaves with numerous segments ; segments lobed or cleft. 



3. ^". inillelobalw. 

 Leaves rather thick ; root perennial. 



Bracts thick, much shorter than the disk. 4. S. niuUilobahts. 



Bracts thiii, almost equaling the disk. 5. S. Nelsonii. 



I. Senecio sanguisorboides sp. nov. 



Tall and simple, perfectly glabrous, annual or maybe biennial : 

 stem terete, about 6 dm. high, leafy : basal leaves thin, 1-2 dm. 

 long, petioled, pinnately divided with 3-5 segments ; terminal seg- 

 ments reniform, 3—5 cm. wide, coarsely crenate ; lateral segments 

 almost orbicular, crenate : lower stem leaves similar ; the upper 

 with 7— II segments, short-petioled or the uppermost subsessile ; 

 the base of the petioles with large round, laciniate auricles ; ter- 

 minal segment ovate, incised-crenate ; the lateral ones obovate 

 or broadly cuneate : cyme rather contracted : heads about i cm. 

 high; bracts 12-16, linear-lanceolate, acute, about i mm. wide, 

 with membranous margins ; the calyculate ones very few and 

 minute, lanceolate : rays about lo, 8 mm. long and 3 mm. wide, 

 about 4-nerved : achenes glabrous and angled. 



This has been referred to .S". Sangiiisorbae DC; but a compari- 

 son with De Candolle's description shows several discrepancies. 

 According to the description S. Sangiiisorbae should have 6nly 

 8-IO bracts and 5 rays, the leaves should be puberulent beneath 

 and the terminal 'segment orbicular, characters not found in the 

 present species. The latter grows at an altitude of 2500-3000 



m. [Plate 5, f. 14.] 



New Mexico: Santa Fe Caiion, 1897, A. A. & E. Gertrude 

 Heller, j8 20 (type in the herbarium of the N. Y. Botanical Garden) ; 

 White Mountains, 1897, E. O. IVoofoji, ^g^. 



2. Senecio Greggii sp. nov. 

 Sefiecio Tanipicamis A. Gray, PI. Fendl. 109. 1849; not DC, 

 1837; 5. lobatiis A. Gray, PI. Wright. 2 : 99. 1852; not 

 Pers. 1807. 



