450 COMPOSITAE 
41. Senecio bréweri Davy. Brewer's Butterweed. Fig. 5782. 
senere abdontte eAUBee claw a: E16, 
var. ractus Greenm. pay Mo. Bot. Gard. 4: 31. 1917. 
Leafy-ste — gies with solitary stems from a short c —— mostly 4-8 dm. tall; 
herbage eoeiainiiy glabrous or with a little si istent tomentum aut e axils. Leaves thin, all 
pinnati the large ower ones “generally lyrate, with enlarged, ro terminal seg- 
t to 10 c ong and 8 r ir 
rge n e stem thus e€ i 
several or rather many in a corymbiform noi ping relatively large; the glabrous involucre 
mostly 7-11 mm. high, “i ecadl | bracts about 21 or sometimes only 13; i baarnples few and small 
or wanting; disk 1-1.5 cm. wide; rays el 15 mm ge achenes glabro 
Open or lightly wooded slopes in the valleys and foothills, Upper Sonoran same? matey 7 wate eo 
from Contra Costa County to Son Luis Obispo. ‘Counts and in the Tehachapi and Greenh n Mountains, Ker 
County. Type locality: Alameda County, California. April-Jun 
42. Senecio eurycéphalus Torr. & Gray. Cut-leaved Butterweed. Fig. 5783. 
Senecio eurycephalus Torr. & Gray ex A. Gray, Mem. oe Acad. IT. 4: 109. 1849 
Senecio austiniae Greene, Bull. Calif. Acad. 1: 93. 
sets sa asenng var. austiniae Jepson, Man ee m Cali ‘ae 1925. 
oset J. T. Howell, Leaflets West. Bot. 3: 
Pecaiiat with several or stems arising aa a taproot and Lateageets woody caudex, 
2.5-6 dm tall ; soe aeat fae thinly tomentulose and often eventually more or less glabrate, or 
prasica Oy early- glabra asal or lower cauline leaves well pita ee pinnatifid or pinnately 
dissected to merely Sate with sharply toothed segments or rarely merely laciniate-toothed, 
iddle € cauli ced and becomi 
n 
corollas a — 7-10 mm. long; rays 1-2 cm. long; achenes 3.5-6.5 Peas long, ue teal 
Dry s, Upper Sonoran and Transition consi fasshers Cascade Mountains in Shas Butte, and 
Mo soot Atdel “California, south through the Inner Coast Ranges wag ie Bay. ape Mlecality: Cali- 
fornia. April-Jun 
43. Senecio multilobatus Torr. & Gray. Basin a eos Fig. 5784. 
Senecio neigh Torr. & Gray ex A. Gray, Mem. Amer. Acad. II. 4: 109. 184 
s Gr 95; 
enecto lync eene, Erythea 3: 22. 1 
Senecio meleoaii [var.] wintahensis A. Nels. “ee Torrey eee 26: 484. 1899. 
Senecio wintahensis Greenm. Monog. Gatt. ol: 24. 
Senecio stygius Fr es — Bot. 2-2 ee 
Senecio prolivus Gr . Ann. Mo. aes . 914. 
Senecio souibligtiics +i var. i oe oe aty gre) Fi. - ae 1154, 1925, 
Perennial, sometimes rather a ort-lived, with 1 or several stems arising from a short oot 
which is esol surmounted by a short F ckod caudex, 1-5 dm. tall; herbage thinly oie 
nd often eventually glabrous or sg glabrous from the first sal leaves well developed, pin- 
natifid ften lyrate-pinnatifid, commonly with toothed segments, up t u cm. lo’ 
wide; ca leaves more less reduced but still generally fairly well developed, 
o ore dissected than those below and less often lyrat ds 1 nly rather 
numerous, 1 medium-si he disk com ‘ ; involucri 
igh, the bracts about 13 or rai 21; bracteoles small and inconspicuous or w ; dry 
Sag rhe) about 4.5-7.5 m ong; rays 5-10 mm. long or occasionally wanti ‘ie vachenes 
3.5 m. long, glabrous or "hispida lous. 
Dry o . aces in the deserts and sokole. sometimes extending to high elevations in the drier southern 
mountains, Arid Transition a Sonoran outhwestern Wyoming to western Texas and ba Mexico, 
west t gon, northeastern Cotten Nevada, and os — south of the Sierra Nevada 
Type ape sea ‘on the Uintah | River | in the interior of California.” April—Jul 
44. Senecio jacobaea L. Tansy Ragwort. Fig. 5785. 
Senecio jacobaca L. Sp. Pl. 870. 1753. 
Biennial or rather short-lived perennial with a poorly developed to evident taproot; stems 
solitary or 22% ral, erect, simple up to the inflorescence, 2-10 dm. tall; pubescence thinly floccose- 
tomentose but evanescent and generally nearly or quite wanting 2 "flower ing time, except fre- 
quently in the I scence. em ves equably gion garee mostly 2-3 _— pinnatifid, about 4-20 
cm. long and 2-6 cm. wide, the lower petiolate and often deciduous, upper get sessile ; 
heads several or rather nu merous in a short ee sloresteaae the ‘dis k about 7-10 mm. wide; 
involucre beige 2 tes cake lade ie its bracts about 13, over 1 mm. wide, generally dark-tipped ; ng tne 
narrow rather well developed ; i co mmonly about oe mostly 4-10 mm. long; 
ae of the d tisk pita minutely Ske ca. those of the rays glabro 
nm pastures and other sete hs situations; native of Europe, now unions in rug of the United 
States and Bee god bee becomin ape He = seed west of the hae Sa Mo Rin n Oregon and Washington 
Poisonous to livestock. northern California, ee 
