1917] 
GREENMAN— MONOGRAPH OF SENECIO 29 
about 1 cm. high, radiate; involucre campanulate, sparingly 
calyculate, glabrous; bracts of the involucre usually about 21, 
linear-lanceolate, 6.5 to 8 mm. long; disk-flowers numerous; 
achenes glabrous. 
Distribution: known only from Arizona. 
Specimens examined: 
Arizona: ‘‘Oak Creek,’’ 23 June, 1883, Rusby 672 (U. 8. 
Nat. Herb. and Phil. Acad. Nat. Sci. Herb.; fragments and 
photographs in Mo. Bot. Gard. Herb.), түре; without locality, 
coll. of 1883, Rusby 175 (Gray Herb.), type of S. macropus 
Greenm. 
92. S. franciscanus Greene, Pittonia 2: 19. 1889; Greenm. 
Monogr. Senecio, I. Teil, 24. 1901, and in Engl. Bot. Jahrb. 
32: 20. 1902. 
A low herbaceous subcespitose perennial, 1 dm. or less high 
from an ascending or suberect rootstock, at first somewhat 
tomentulose, later glabrate, more or less tinged with purple; 
leaves mostly pinnately divided, including the petiole 1-5 em. 
long, .5 to 1.5 em. broad, thickish in texture; the lowermost 
leaves sometimes undivided and subrotund, about 1 ст. long 
and broad, crenate-dentate; heads solitary or few, 10 to 12 
mm. high, radiate; involucre campanulate, sparingly calycu- 
late; bracts of the involucre 13 to 21, linear-lanceolate, 7 to 10 
mm. long, tomentulose at the base, glabrous and purplish 
above; rays yellow; disk-flowers numerous; achenes glabrous. 
Distribution: known only from the high mountains of 
northern Arizona. 
Specimens examined: 
Arizona: volcanic rocky soil near the summit of San Fran- 
cisco Mountains, 10 July, 1889, Greene (U. S. Nat. Herb.), 
TYPE; summit of Mt. Agassiz, in voleanic scoria, Aug., 1884, 
Lemmon (Gray Herb. and U. 8. Nat. Herb.); peak of San 
Francisco Mountains, alt. 3050 m., 30 Aug., 1884, М. Е. Jones 
15 (Gray Herb.) ; San Francisco Mountains, 23 Aug., 1889, 
Knowlton 95 (U. S. Nat. Herb.); Humphrey’s Peak, San 
Francisco Mountains, alt. 2740-3050 m., 7-10 Aug., 1898, Mac- 
