[Vor. 4 
24 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
floccose-tomentulose, later more or less glabrate, thickish in 
texture; upper stem-leaves sessile and pinnatifid to entire, 
often much reduced; inflorescence a terminal corymbose cyme; 
heads numerous, 8 to 10 mm. high, radiate; involucre cam- 
panulate, sparingly calyculate, glabrous or slightly tomentu- 
lose at Ше base; bracts of Ше involucre usually 21, occasion- 
ally fewer (13-21), linear-lanceolate, 5 to 7 mm. long; ray- 
flowers 8, rays yellow; disk-flowers 35 to 60; achenes glabrous. 
Distribution: northern Arizona. 
Specimens examined: 
Arizona: San Francisco Mountains, July, 1883, Rusby 666 
(Gray Herb. and Mo. Bot. Gard. Herb.), түре; Flagstaff, 
Мау, 1893, Wilson 116 (Univ. Calif. Herb.) ; vicinity of Flag- 
staff, alt. 1695 m., 31 May, 1898, MacDougal 12 (U. 8. Nat. 
Herb., Phil. Acad. Nat. Sci. Herb., Univ. Ariz. Herb., and 
Gray Herb. in part) ; Mormon Lake, alt. 1825 m., 7 June, 1898, 
MacDougal 69 (Gray Herb. and U. S. Nat. Herb.) ; vicinity 
of Flagstaff, alt. 2135 m., 15 June, 1898, MacDougal 114 (Gray 
Herb. Phil Acad. Nat. Sci. Herb., and U. S. Nat. Herb.) ; 
Flagstaff, 30 June, 1892, Тоитеу 706 (U. S. Nat. Herb.) ; 
Flagstaff, 6 July, 1901, Н. S. Barber 143 (U. S. Nat. Herb.) ; 
Grand Сайоп, 12 June, 1891, MacDougal (U. S. Nat. Herb. 
No. 49362, in part). 
The specimens here cited have been variously referred to 
S. multilobatus Torr. & Gray, to S. lynceus Greene, and to 
S. neo-mezicanus Gray. Habitally it is somewhat intermediate 
between the two last-mentioned species; and through S. neo- 
mexicanus the present group is connected with the section 
Tomentosi. S. Thornberiis named in honor of Professor J. J. 
Thornber, a distinguished student of the flora of Arizona. 
89. S. uintahensis (Nelson) Greenm. Monogr. Senecio, I. 
Teil, 24. 1901, and in Engl. Bot. Jahrb. 32: 20. 1902; Nelson 
. in Coulter & Nelson, Manual Cent. Rocky Mountains, 581. 
1909; Garrett, Spring Fl. Wasatch Region, 101. 1911, and ed. 
2, 123. 1912. 
S. Nelsonii var. uintahensis Nelson, Bull. Torr. Bot. Club 
26: 484. 1899. 
