430 COMPOSITAE 
oped short rays; involucre 12-16 mm. high, rather cesta shorter than the disk, the bracts mostly 
about 8 or about 13, — i and often with some intermingled longer glandless — 
pappus of about 15 or stout, flattened, — rintien that a the rays, when these are 
age: similar to ee “7 the disk ; achenes pubesc 
places at high altitudes in the mountains, rarely iseeea ing as low as 6,500 feet, Hudsonian Zone; 
Ciacale "Mourtains of gor Oregon (the Three Sisters) — ital the Sierra Nevada. Type locality: on 
a peak of the Sierra Nevada northeast of Soda Spr July—Aug 
5. Raillardella argéntea A. Gray. Silky Raillardella. Fig. 5741. 
Reatneise meaanies A. Gray, Proc. Amer. Acad. 6: a 1865. 
A. Gray, Bot. Calif. 1: 417 
Raillardella minima Rydb. N. Amer. F1, 34: 319. de 
Habitally similar to R. scaposa but more strictly eepoee oe mie sharply in its con- 
pc sky -tomentose, n a at all glan ee pe leaves ; plan s bearing well-developed 
ing rhizomes ; scape sho rter, mostly 1-12 cm. tall; heads sect dicehid involucre averaging 
a a little smaller, mos er 9-15 m m. high, peace composed es ne 
Ope places at high altitudes in the mountains, rarely “Hu dso and 
Alpine 2 Zoides yee Mountains > central Oregon (the Sine Sieteres sallel Crreeee the Sier ore evada and 
on San Gorgonio Peak in the San Bernardino Mountains. Type locality: Sonora Pass, California. July—Sept. 
110. SENECIO L. Sp. Pl. 866. 1753. 
Heads radiate or sometimes discoid, the rays — is fertile, yellow to orange o 
occasionally reddish, purple, or white or w Inv ral bracts herbaceous or i 
r ially equal, 
e r 
entire to minutely sagittate. Style-branches more or less flattened, truncate, penicillate, 
with introrsely marginal stigmatic lines extending to the tip or ate short- appendiculate. 
Achenes subterete, 5-10-nerved ; pappus of numerous, usually white, entire or barbellulate, 
or divided leaves and solitary to numerous, mostly small to medium-sized, cylindric to cam- 
panulate or hemispheric heads. [Name from the Latin senex, an old man, probably 
ferring to the white pappus or hoary pubescence of some species. | 
One of the largest genera of plants, containing probably well over 1,000 species, of very wide geographic 
distribution, ro 100 in North America north of Mexic - Bit ype species, Senecio vulgaris L. 
Man the species are a related, often, indee ith only about the ‘aap ree of distinctness more 
mmo aye hee ih! ted with varieties. This is epectatly true o the species prse treated under the groups Aurei, 
Lobake and Tomentost, which collective form a mike complex bec few no clear-cut specific lines. The 
ei. Pa ps indicated in the key in large part natural and correspon some degree to the ns of 
the species-groups 0 “ Rydberg: “or purposes of this erentieast i. are, however, considered to be 
groups of convenience without taxonomic s 
Senecio élegans 3 ay 869. 1673, % ee species with lyrate or - geeeacaias leaves and purple rays, is 
adventive in sandy aut. ut San Francisco. It is native to South Afric 
Stems erect or ee never —— or climbing; leaves various but scarcely ivy-like; heads various. 
Plants perennial (or in S. jacobaea sometimes merely bienn 
Leavy -. —, distributed along the stems, only Seis or ‘ol reduced upwards; no tuft of basal 
Leaves to skis times Bdsrinsmr ps - Scena gment: id a than linear; espa lived, 
all woody, VIII. JacosBagEa 
Touvedl venir. to toothed or pinnatifd « or in the woody insular species, S. /yonti, often ‘isleianiide 
specie: 
Leaves either na rrowly linear or entire or pide pinnatifid (or in S. lyonii often bipin- 
-pocomy 28 ‘with reer i mostly elongate segments; plants taprooted, with numerous stems 
endi ate tacone o. y below oe UFFRUTICOSI. 
coer evident ATE than linear, merely tocthan or entire (or ae me pepnatiionnte 
in S. clarkianus) ; herbs, fibrous-rooted except for S. fremontit. II. Trr 
Leaves basally disposed, the basal or lower cauline pact well developed, often tufted, thet cui evi- 
dently and progressively reduced (or the stem scapose). 
Plants with the numerous "yr ae — arising hese a ver age — short- nage crown withou 
(except goss nae pe a Ste sulus) ae more elongate cau udex or rhizo eaves entire od 
ate, or a integerrimus occasionally Petes As sublobed; “herbage crisp- 
hairy to pS gp eC i a nee gaa or tom . COLUMBIA 
Plants taprooted, or more often fibrou a from ascending or horisontl, simple or often 
ca og caudex phe a creeping rhizome; ne Boceine variously fl or tomentose to 
al iry. 
Leaves all sharply dentate or gta age sg to , soon (in forms of S. sphaero- 
cephalu: >, all ye never crenate, lobed, nnatifid; bracteoles br to = Pegi dl 
well dev as are also Ro least’ the lowe: a leaves; _ y tom 
Fest villous, at wane when young. . Lv sat Ara 
Leaves otherwise (some or all of them crenate, serrate, lobed, or pinn lait or all entire in 
‘ in vince which differ in other respects from the foregoing group; habit and vesture 
Breen lea entire or toothed to sometimes pinnately irregularly few-lobed, ordinarily 
panies pinnatifid, lyrate, nor at all palmately lobed. 
Herbage more = less tomentose at flowering time, sometimes only thinly or rather 
¥ SO; Species a a dry habitats at various altitudes. : 
V. ToMeEnNTOsI. 
