1917] 
GREENMAN—MONOGRAPH OF SENECIO 23 
dentate lateral lobes; inflorescence a terminal few to several- 
headed corymbose cyme; heads 8 to 10 mm. high, radiate; 
involucre campanulate, calyculate; bracts of the involucre 
usually 21, linear-lanceolate, slightly shorter than the flowers 
of the disk, glabrous or white tomentulose at the base; ray- 
flowers about 13, rays bright yellow; disk-flowers 60 to 85; 
achenes glabrous. 
Distribution: mountains of northern Mexico. 
Specimens examined: | 
hihuahua: near Colonia Garcia in the Sierra Madres, 
alt. 2315 m., 13 July, 1899, Townsend d£ Barber 131 (U. 8. 
Nat. Herb. Nos. 383217, 735374, Gray Herb., and Mo. Bot. 
Gard. Herb.), Tyee; moist meadows, Guachochie, 25 June, 
1892-93, Hartman 521 (Gray Herb.); in the Sierra Madres, 
21 June-29 July, 1899, E. W. Nelson 6106 (U. S. Nat. Herb.) ; 
vieinity of Madera, alt. about 2250 m., 27 May-3 June, 1908, 
Dr. E. Palmer 305 (U. S. Nat. Herb.). 
Durango: in the Sierra Madres, 48 km. north of Guanacevi, 
alt. 2435-2745 m., 18 Aug., 1898, E. W. Nelson 4771, 4778 
(U. S. Nat. Herb.); El Oro to Guanacevi, 14-16 Aug., 1898, 
E. W. Nelson 4746 (U. S. Nat. Herb.). 
88. S. Thornberi Greenm.! 
An herbaceous perennial; stems solitary or somewhat 
cespitose, erect, 1.5 to 3.5 dm. high, glabrous or slightly 
tomentulose; radical and lower stem-leaves narrowly obovate 
to oblong-oblanceolate, including the petiole 2.5 to 10 em. long, 
.9 to 1.5 em. broad, crenate-dentate to sublyrate, at first white- 
ae Thornberi Greenm. вр. nov., herbaceus perennis; caulibus soli- 
tariis e ре aespitosis мірі 1.5-3.5 dm. alti is, glabris vel parce to саана; 
foliis кка к anguste obovatis vel 1 oblongo- oblanceolatis et crenato-dentati 
vel ста atis petiolo еве .5-10 em. longis primo albo-floccos o-tomentulosis 
denique plus minusve glabratis crassiusctlis; foliis superioribus sessilibus et pin 
natifidis aliquando multo reductis et integris; inflorescentiis terminalibus согуш- 
boso-cymosis; capitulis numerosis 8—10 mm. 'altis, radiatis; involuero campanu- 
lato parce calyculato glabro vel ad basin tomentuloso; bracteis involucri 
plerumque 21 (13-21) lineari-lanceolatis 5-7 mm. longis; floribus femineis 
а, ligulis flavis ; floribus rus 30-65; achaeniis glabris.—Arizona: San 
Francisco Mountains, July, 1883, Rusby 666 (Gray Herb. and Mo. Bot. Gard. 
я ; уїсїпї Ну о 2 Flagsta я. Wilson 116 (Univ. Calif. Herb.), MacDougal 
12 (U. S. Nat. Herb., Phil. Acad. N Sci. Herb., Univ. Ariz. Herb., and Gray 
Herb. < 2e MacDougal 114 Gray 1 Herb. Phil. Acad. Nat. Sei. Herb., and 
U. S. Nat. Herb.), Тоитеу 706 (U. S Herb. ), and Barber 148 (U. S. Nat. 
Herb.) ; zo n Lake, MacDougal 69 S Herb. and U. S. Nat. Herb.). 
