1915] 



GREENMAN — MONOGRAPH OF SENECIO 599 



and remotely dentate to laciniately pinnatifid, oblanceolate to 

 oblong-lanceolate in general outline, 3 to 10 cm. long, 1 to 4 

 cm. broad, divisions linear and entire to dentate, acute or 

 obtuse ; lower leaves petiolate, the upper sessile ; inflorescence 

 a loose several to many-headed corymbose cyme ; heads 10 to 

 13 mm. high, radiate; involucre narrowly campanulate, cal- 

 culate, glabrous ; bracts of the involucre commonly 13, linear- 

 lanceolate, 8 to 10 mm. long, terminated by a small black or 

 brownish penicillate tip ; flowers pale yellow ; ray-flowers 5 to 

 8, occasionally much reduced ; disk-flowers 35 to 50 ; achenes 



glabrous. 



Distribution: northern Mexico. 



Chihuahua : near Colonia San Garcia in the Sierra Madre, 

 alt. 2285 m., 9 Sept., 1899, Townsend S Barber 317 (Mo. Bot. 

 Gard. Herb., Gray Herb., and U. S. Nat. Herb.), type; Mound 

 Valley, Sierra Madre Mountains, alt. 2130 m., 18 Sept., 1903, 



Jones (U. S. Nat. Herb.). 



The Townsend and Barber specimens have been distributed 

 as "Senecio Chihuahuanus Wats." and the Jones plant was 

 distributed as " Senecio eremophilus" under which names 

 they may be looked for in herbaria. 



12. S. chihuahuensis Watson, Proc. Am. Acad. 23 : 280. 

 1888 ; Greenm. Monogr. Senecio, I. Teil, 23. 1901, and in Engl. 

 Bot. Jahrb. 32 : 19. 1902. 



An herbacous perennial ; stem erect, 4 to 5 dm. high from a 

 rather slender rootstock, striate-angulate, somewhat purplish ; 

 early leaves oblanceolate, 3 to 5 cm. long, 1 cm. broad, lacini- 

 ately dentate, arachnoid-tomentulose on both surfaces; later 

 stem-leaves short-petiolate, or subsessile, oblong-ovate in 

 general outline, about 8 cm. long, one-half to two-thirds as 



groase-dentatis vel laciniato-pinnatis, oblanceolatia vel oblongo-lanceolatia in 

 circumscriptione, 3-10 cm. longis, 1-4 cm. latis; laciniis linearibus et integris 

 vel dentatis acutia vel obtusis; foliis inferioribua petiolatia, auperioribua sessili- 

 bus; infiorcacentibua laxe corymboso-eymosia multicapitatis; capitulis 10-13 mm. 

 altis, radiatis; involucria anguate campanulatis calyculatis glabris; bracteia 

 involucri 13 lineari-lanceolati8 8-10 mm. longis minute atro- vel fulvo- 

 penicillatis; floribus pallide aurantiabua; floribua femineis 5-8 nonnunquam multo 

 reductia; floribua disci 35-50; aehaeniia striatia glabria. — Near Colonia San 

 Garcia in the Sierra Madre, State of Chihuahua, Mexico, alt. 2285 m., 9 Sept., 

 1899, Townsend & Barber 317 (Mo. Bot. Gard. Herb., Gray Herb., and U. S. Nat. 

 Herb.), type; Mound Valley, Sierra Madre Mountains, alt. 2135 m., 18 Sept., 

 1903, Jones (U. S. Nat. Herb.). 



