446 COMPOSITAE 
31. Senecio pauciflédrus Pursh. Rayless Alpine Butterweed. Fig. 5772. 
we lo paucifi Pursh, Fl. Amer. Sept. 529. 1814. 
Fi br rous-rooted perennial from a penile or slightly ee cane 1.54 dm. tall, glabrous 
or lightly floccose-tomentose when young. Leaves thickish, s what succulent in life, the basal 
ones goncvices gh 8 Bc to subr ottttid, abruptly paaiarked to Nthe truncate or shallowly creat 
base, crenate, petiolate; cauline leave § reduc ed and gee coming sessile, bluntly toothed or m 
less pinnatitd with blunt johes : heads m mane 2-6, rarely 12, orange or reddish, discoid or pane 
ith s - involucre 6-8 m «ey its bracts ee ut 21 or about 13, generally suffused with 
reddis h purple, at — aboue the "middle: bracteoles inconspicuous or wanting; disk 1-1.5 cm. 
wide ; achenes glabro 
Alpine and tae a Seated and moist cliffs, Boreal Zone; Alaska and Yukon to Labrador, south to Quebec, 
and to northern Vrouing, nor teeny na’ and northern Washington, and throughout the Sierra Nevada of 
California. Type locality: Labrad July—Aug. 
eplanty rs California eh to be more robust than the northern, more typical forms of the species, with 
euinehak as re numerous heads, and more often neonuee i cease forms. Many of the California specimens are 
wholly characteristic of S. pauciforus, howev and n nomic segregation seems possible. Not known to me 
on 
52. Senecio indécorus Greene. Rayless Mountain Butterweed. Fig. 5773. 
Greene, Fl. Fran. 470. (Aug Ps | 1897 
Ss io tdah Rydb, Bull. i — “ihe 183. 1900. 
Senecio p ifl p. fallax Greenm. in Piper, Contr. okey Nat. Herb. 11: 597. 1906. 
Senecio p ifl f fallax Fernald, ehndars ah: 225. 19 
Fibrous-rooted perennial from a simple or oe Liner caudex, 3-8 dm. tall, glabrous 
or lightly floccose-tomentose when young. Leaves tom sigied thin, not succulent, the basal ones 
eeatts elliptic or broadly ovate, tapering or subtruncate at the 4 Se se, serrate sometimes in- 
cised, petiolate; cauline leaves sharply incised- pinnati, ‘the iad irregularly a gain 1 SOAS, 
reduced and becoming sessile upwards; heads mostly 6-40, , discoid or rarely with shor 
rays; involucre mostly 7-10 m in, tech i ts bracts 1 mostly about Sf sometimes on ay a8 often sbi 
tipped: bracteoles short and i os slg 6-1 wide; achenes glabro 
Moist woodlands, stream banks, swales, and a ii go Alaska and Yukon to Aaa ae n Washing- 
ea a Wyoming, and a pparently in northern California. Type locality : Pine Creek, Lassen Conner. "Calitoeata. 
uly—Aug 
It is ‘possible that the ty ype of S. indecorus Greene is merely an aberrant form of S. pseudaureus or a hybrid 
males S. pseudaureus and Ee pet and ere he proper name for the species here ‘Aoectibed:i is S. idahoensts 
ydb. 
33. Senecio pseudatreus Rydb. ~~ Butterweed. Fig. 5774. 
Ss io pseud Rydb. Bull. Torrey Club 24: 298. (June 
.4 io p ifl var. jucundulus Jepson, Man. FI. Pl. aE Mert 1925. 
Fibediss rooted perenni a from a short, horizontal or ascending rhizome or caudex, 3-7 dm 
tall, lightly floccose-tomentose at first, soon essentially glabrous. Leaves relatively thin, not suc 
culent, the basal on eg aeniclote, the blade serrate, tending to be cordate, subcordate, or ‘rut 
cate at the base; caging leaves few and progressively reduced oe b ing sessile, more 
or less laciniate-pinnatifid at least toward their bases; heads several or disk about 
8-13 mm. wide; involucre 5-8 mm. high, the bracts about 13 0 agra 2b hemeenees inconspicuous 
or tia rays a ets 6-10 mm. long; achenes glabrous. 
Stream banks, meadows, and moist woodlands in aed. near the aang “pu mostly vind aoe Zone; 
Hite res Columbia to  Caskethewen om to tes atte ornia in the southern Sierra Nevada and i w Mexico. Type 
locali e Belt Mountains, Montan 
ug. 
tpt ar. pseudaureus, as Genarih rnc occurs in our range. The var. pr esr f Greene) Greenm., with 
nore eenee aged leaves, replaces the var. pseudaureus in the southern Rocky Mountains and on the northern 
reat Plains 
34. Senecio paupérculus var. thomsoniénsis eloraaey Boiv. Canadian 
Butte 5775 
rweed. Fig 
Senects mnalinoman ste. Greenm. are Nat. 25: 115. 1911. 
. thomsoniensis Greenm. op. cit. 116 
Sensei flavovirens var. thomsonien. Li Gee eenm. Ann. Mo. Bot Aap 3: 169. 1916. 
enecio pestle var. thomsoniensis Boivy. Nat. Can. 75: 214. 1948, 
ook rooted perennial with a rather short, pe or slightly branched caudex, occasionally 
with some ng short, slender alin, mostly 2-7 dm. ta ll, lightly floccose-tomentose when young, 
soon glabrate except. frequen aati t the base and in the leaf-axils. Basal leaves petiolate, the blade 
oblanceolate * elliptic or occasionally suborbicular, crenate or serrate to subentire ; cauline leaves 
ors or less pinnatifid, the lower sometimes larger than the basal, the others conspicuously re- 
se 
and be ing sessile, all relatively thin and not at all succulent; heads eral, the disk 
7-12 mm. wide ; involucre 9 mm. high, the bracts about 13 or about 21; bracteoles 1n- 
conspicuous 0: re rays about 5-10 mm. long or very rarely wanting; achenes glabrous or 
poniunm hispidulou 
am banks, swamps, m meadows, moist woods, and ist cliff: tl the foothill d valleys, sometimes 
at sone elevations in the mountains, Transition and Canned ‘a ‘ n Zones; louthern Natale tevatathorn Oregon and 
western Montana. Type locality: North Thompson River, Deitch Columbia. Ma 
The species as a whole ranges from Labeaaor te 0 southern Yukon, entitk to Virginia, New Mexico, and northern 
