MONOGRAPH OF THE NORTH AND CENTRAL 
AMERICAN SPECIES OF THE GENUS 
SENECIO — PART II! 
J. M. GREENMAN 
Curator of the Herbarium of жы Missouri Botanical Garden 
Associate Professor in the Hen y Shaw School of Botany of 
Washington ка ity 
бест. 7. Повалті Rydb. 
87. Поваті Rydb. Bull. Torr. Bot. Club 27: 169. 1900, in 
part; Greenm. Monogr. Senecio, I. Teil, 22, 24, 29, 30. 1901, 
and in Engl. Bot. Jahrb. 32: 18, 20, 25, 26. 1902 
Herbaceous perennials, glabrous or white floccose-tomentu- 
lose in the early stages and more or less glabrate, rarely per- 
manently tomentose throughout; stems erect or ascending, 1 
to 10 dm. high, one to several from a common base or root- 
stock; foliage variable but mostly pinnatifid; the earliest 
leaves obovate or oblanceolate and undivided to lyrate; heads 
radiate or occasionally discoid; achenes usually striate, 
glabrous or hirtellous along the ‘angles Plants of western 
United States and northern Mexico. Sp. 81-96 
КЕҮ то THE SPECIES 
A. Heads е іп size, 8 to 10 mm. high, radiate or 
rarely discoid. 
a. Achenes ais hirtellous. 
a. Involucral es about 13. 
ne about З dm.:or less esa leaf-seg- 
ents narrow, rather remote........... 81. S.multilobatus 
II. tans 4 to 5 dm. high, stan did segments 
ЕЕЕ 5002.22 82. S.lapidum 
B. Involucral bracts about 21. 
I. Stems uniformly leafy................... 83. S.millelobatus 
II. Stems not uniformly leafy............... 84. 8. parrasianus 
b. Achenes usually glabrous. 
Involueral bracts 13; heads discoid.......... 85. В. leucoreus 
В. Involueral bracts usually 21; heads radiate. 
r leaves subbipinnate or deeply pin- 
natisect into numerous small пра .86. 8. lynceus 
II. Lower leaves obovate or oblanceolate and 
oe rx te to ад к. pinnatiód, je bipin- 
1 Issued TR "m 1917 
NoTE.—The present paper is continued from Ann. Mo. Bot. Gard. 3: 85-194. 
1916. 
ANN, Мо. Вот. GARD., VOL. 4, 1917 (15) 
