170 RvDBERG : Studies on Rocky Mountain Flora 



the very first, pinnStely 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 I cm. high ; terminal segments of the basal leaves 3-5 cm. wide. 



1. S. sangiiisoi-boides. 

 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 numei^ous segments ; segments lobed or cleft. 



3. S. Diillelobaltt':. 

 Leaves rather thick ; root perennial. 



Bracts thick, much shorter than the disk. 4. 6". Diidtilohatits. 



Bracts thin, almost equaling tlie disk. 5. S. A^elsonii. 



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 1 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 10, 8 mm. long and 3 mm. wide, 

 about 4-nerved : achenes glabrous and angled. 



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

 son with De Candolle's description shows several discrepancies. 

 According to the description S. SangJiisorbac should have only 

 8-10 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. Wooton, ^.gjj.. 



2. Senecio Greggii sp. nov. 

 Seneeio Tainpicanus A. Gray, PI. Fendl. 109. 1849; not DC., 

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

 Pers. 1807. 



