1918] 
GREENMAN—MONOGRAPH OF SENECIO 97 
Macoun 554 (Geol. Surv. Canada Herb. and Greene Herb., 
Univ. of Notre Dame). 
Washington: dry rocky places, Mt. Constitution, San Juan 
Co., 12 July, 1904, Flett 2743 (Gray Herb.). 
Oregon: valley of Columbia River, Oregon Boundary Com- 
mission, 1860, Dr. Lyall (Kew Herb., Berlin Herb., fragment 
and tracing in Gray Herb.), type of var. eroso-dentatus; moist 
ground, Willamette Valley, near Tangent, 18 June, 1881, col- 
lector not indicated (Piper Herb.); Eugene, July, 1895, col- 
lector not indicated (Univ. Chieago Herb. at Field Mus. No. 
366869). 
129. S. umbraculifer Wats. Proc. Am. Acad. 23 : 279. 1888; 
Greenm. Monogr. Senecio, I. Teil, 24. 1901, and in Engl. Bot. 
Jahrb. 32 : 20. 1902 (originally spelled umbraculifera). 
An herbaceous perennial, densely white-tomentose through- 
out; stem simple, erect, 5 to 9 dm. high, rising from a stoutish 
slightly ascending rootstock; leaves oblong-oblanceolate, 5 to 
20 cm. long, .5 to 2.5 em. broad, apiculate-acute, entire or den- 
tieulate, gradually narrowed into a winged petiole, densely 
and permanently white-tomentose on both surfaces; upper 
stem-leaves sessile, narrowly oblong-lanceolate; inflorescence 
a terminal many-headed corymbose cyme; heads about 1 em. 
high, radiate; involucre campanulate, calyculate; bracts of the 
involucre about 13, linear-lanceolate, 6 to 7 mm. long and, as 
well as the bracteoles, terminated by a brownish tip; ray-flow- 
ers 5 to 8, rays yellow, conspicuous; disk-flowers 14 to 20; 
achenes hispidulous. 
Distribution: northern Mexico. 
Specimens examined: 
Chihuahua: summits of the Sierra Madre, alt. 2950 m., 3 
Oct., 1887, Pringle 1316 (Gray Herb., U. S. Nat. Herb., and 
Phil. Acad. Nat. Sci. Herb.), TYPE. 
130. S. atratus Greene, Pittonia 3: 105. 1896; Greenm. 
Monogr. Senecio, I. Teil, 24. 1901, and in Engl. Bot. Jahrb. 
32:20. 1902; Rydb. Fl. Colo. 395. 1906; Nelson in Coulter 
& Nelson, Manual Cent. Rocky Mountains, 580. 1909, in 
