1915] 



GREENMAN MONOGRAPH OF SENECIO 613 



5 to 6 mm. long, glabrous ; ray-flowers 13, rays oblong, 6 to 7 

 mm. long, 2.5 mm. broad, 4-5-nerved; disk-flowers 60 to 70; 

 achenes glabrous. 



Distribution: central Mexico. 



San Luis Potosi: " region of San Luis Potosi," alt. 1830- 

 2440 m., coll. of 1878, Parry & Palmer 533 (U. S. Nat. Herb.), 



TYPE. 



24. S. Sanguisorbae DC. Prodr. 6 : 427. 1837 ; Hemsl. Biol. 

 Cent.-Am. Bot. 2 : 246, 1881, in part ; Greenm. Monogr. Sene- 

 cio, I. Teil, 23. 1901, and in Engl. Bot. Jahrb. 32 : 19. 1902. 



An herbaceous perennial; stem erect, 3 to 10 dm. high, 

 striate, glabrous, simple or branched ; leaves pinnately divided, 

 the radical and lower stem-leaves petiolate including the 

 petiole 1 to 4 dm. long, 3 to 13 cm. broad, glabrous on both 

 surfaces or slightly subarachnoid beneath, the upper stem- 

 leaves sessile and more or less amplexicaul; lateral leaf-seg- 

 ments oblong-cuneate to oblong-ovate, 1 to 7 cm. long, .3 to 5.5 

 cm. broad, rather coarsely dentate, the terminal segment 

 usually broadly obovate ; inflorescence a terminal many-headed 

 corymbose cyme; heads 6 to 8 mm. high, radiate; involucre 

 narrowly campanulate, sparingly calyculate; bracts of the 

 involucre 8 to 13, linear-lanceolate 4.5 to 6 mm. long, glabrous ; 

 ray-flowers 5 to 8 ; disk-flowers 15 to 25 ; achenes glabrous. 



Distribution: southern Mexico. 



Specimens examined: 



Hidalgo : by brooks, Sierra de Pachuca, alt. 3050 m., Aug., 

 1902, Pringle 9959 (Gray Herb, and Mo. Bot. Gard. Herb.) ; 

 Sierra de Pachuca, 1 Sept., 1903, Rose & Painter 6739 (Gray 

 Herb. ) . 



Mexico: Toluca, coll. of 1854, 8 chaff 'ner (Gray Herb, and 

 Berlin Herb.); Valley of Mexico, Sante Fe, Bourgeau 832 

 (Gray Herb., U. S. Nat. Herb., Berlin Herb., and Kew Herb.) ; 

 without locality, Gregg 691 (Mo. Bot. Gard. Herb.); Cima, 

 24 Aug., 1910, Orcutt 3767 (Mo. Bot. Gard. Herb.) ; in moist 

 soil along brooks, Mt. Ixtaccihuatl, alt. 3050-3350 m., Nov., 

 1905, Purpus 1514 (U. S. Nat. Herb, and Mo. Bot. Gard. 

 Herb.) ; in moist soil, Mt. Popocatepetl, Sept., 1908, Purpus 



