440 COMPOSITAE 
16. Senecio sphaerocéphalus Greene. Mountain-marsh Butterweed. Fig. 5757. 
Senecio sphaerocephalus Greene, Pittonia 3: 106. 1896. 
Fibrous-rooted perennial from ort, thick, horizontal or sometimes ascending rhizome 
3-8 dm. tall, thinly tomentulose and eric eventually (rarely early) glabrate; stems mostly aris- 
ing singly from the rhizome. Leaves slightly denticulate or entire, the lowermost ones oblanceolate 
ade petiole 5- cm, long and 
cm. 
and upper leaves few, strongly and progressively reduced, becoming sessile; heads about 3-25 in 
a usually rather compact cyme, the terminal seacticle. often eee d and thi ckened ; involucre 
mm. high, its br rani commonly about 21, rarely only 13, bearing a minute, brownish or black 
tip; bracteoles few, n w, shor nhac siccel elongate; disk 8-15 mm. wide; rays 6-10 mm. long; 
achenes usually biajihaious but in our forms glabro 
Wet meadows in and near the ws awa Canadian oe. Montana to northeastern Oregon (Wallowa Moun- 
tains) south to Colorado and northea: n Nev. Type loca lity: Deeth, Humboldt River, Nevada. past Aug. 
Sen s Howell, FI. N. fy a 7. 1900. Similar to S. sphaerocephalus, to which it perhaps 
should ve Fy in teat saa glabrate and with elongate, relatively narrow, lower leaves. Type loealits : Lake 
Labish near Salem, Oregon, where it has been collecend pase times. June. 
17. Senecio scorzonélla Greene. Sierra Butterweed. Fig. 5758. 
Senecio ella Greene, Pittonia 3: 90. 1896. 
Senecio willed Cobe e, Fl. Fran. 469. 1897. 
Senecio covillet var. Sock Jepson, Man. FI. Pl. Calif. 1152. 1925. 
Stems mostly arising singly from a short, thick, — ntal or ascending rhizome, 2-5 dm. 
tall, rarely taller; herbage thinly tomentulose when ng, later often more or less. glabrate. 
asa u 
shor 
strongly an ane progressively reduced, beco sile; heads about 10-30 in a compact cyme, the 
aes on ne ona short thick ee ny ayeriance ed by the others; involucre 3.5 mm. 
the m sigue ely black-tipped bracts commonly about 13, sometimes 8 or 21; bracte oles few 
So ‘ten fairly well developed ; rays scarcely 1 cm. long or sometimes wanting ; achenes glabrous. 
Meadows and moist slopes below timberline, ae and Hudsonian Zones; Sierra Nevada and adjacent 
southern alt — renin from Mount Lassen to Tulare a and in the White Mountains of Inyo County, 
California. Type lo y: - northeastern California.” July—Aug 
18. Senecio lugens Richards. Black- ees Butterweed. Fig. 5759. 
Senecio lugens Richards. in Frankl. 1st Journ. Bot. App. 747. 1823 
Fibrous-rooted ccarargn with the stems mostly abe 2 singly from a short, thick, ascending 
or fhorisontal rhizome, 1-5 dm. tall; hates thinly tomentulose at first, generally subglabrate by 
owering time. Lewes ost aed nely (or eT acon gvinein coarsely) but not closely callous- 
toothed, well-developed, mostly 5-20 cm. long and 8-30 mm wide, the oblanceolate to sometimes 
elliptic or nearly obovate blade pot a to the petiole = netiolita orm base; cauline leaves few, 
strongly and es reduc _upwards, eet aie sile; heads mostly 3-21 in a compact 
c t te i i 
= e others ucre 
5-8 mm. high, the bracts very conspicuously black-tipped, commonly about 13, rarely 21; bracteoles 
chee enti — developed, evidently black- tipped: disk 8-13 mm. wide; rays 7-15 mm. long; 
achenes gla 
nee grassy alpine or arctic slopes, and rich northern woods, Boreal Zone; Alaska and Yukon south 
to af Olymate Mountains of Washington and eotie to northern Wyoming. Not known from a Baga ork 
Cascade Mountains. Type locality: Bloody Fall, on the Coppermine River, Yukon Territor ry. July— 
19. Senecio élmeri Piper. Elmer’s Butterweed. Fig. 5760. 
Senecio elmeri Piper, Erythea 7: 173. 1899, 
__ Perenn ial from a well-dev eloped hranching caudex, 1-3 dm. tall, aig Sage arachnoid- 
villous at first, only thinly so (or even Rabcate) at flowering time. Basal or lower cauline leaves 
the largest, the basal sometimes tufte n separate short shoots, pss ly eae broadly 
m. lon i 3 cm. wide, sharply 
ards an n 
; heads several in a corymbiform inflorescence, the peduncles often flexuous so that the heads 
may be a little nodding ; involucre 7-12 mm. high, bracts mostly about 13, villosulose at the often 
dark or blackish wad bracteoles narrow but well developed; disk 8-15 mm. wide; rays 8-16 mm 
ous. 
d other rocky places, Hudsonian and Arctic-Alpine Zones; at alpine stations in the Cascade 
and i ‘Wenatchee. setts of cane and northern Washington, extending into southern British Columbia. 
Type locality: “North Fork of Bridge Creek, Okanogan County, Wash.” July—Aug. 
20. Senecio neowébsteri Blake. Olympic Butterweed. Fig. 5761. 
Senecio websteri Greenm. Bot. Gaz. 53: 511. par Pigg hs Hook. 1846. 
Senecio neowebsteri Blake, Leaflets West. Bot 
Piha, from coher Mode veloped, SORES caudex or short rhizome, 0.5-2 dm. tall, 
r less arachnoid-villous at first and often also somewhat t glandular, later more or less 
wish. Basal or lower eauliie leaves the hatcet the basal sometimes tufted on separate short 
