436 COMPOSITAE 
= Senecio eA 3 Hook. Arrowhead Butterweed. Fig. 5749. 
Ss h gularis Hook. Fl. B eres 1: 332. 1834 
Si id. DC. Prod. ‘ 428. 1837. 
rapping subvestitus Howell, Erythea 3: fe “Ws, 
. hanseni Greene, op. cit. 124. 
enecio inioonopotick Greene, Pittonia 3: 306. 1896. 
one salions Rydb. Bull. Torrey Club 24: 298. 1897. 
var. subvestitus Greenm. Monog. Gatt. Senecio 1: 25. 1901. 
gularis var. trichophyllus St. John & Hardin, Mazama 11: 95. 1929. 
is var. trigonophyllus M. E. Peck, Man. Pl. paptinne 780. 1941. 
Sev ch stemmed, often rather coarse and lush, fibrous-rooted perennial, mostly 3-15 dm 
tall, niabecats By obscurely agin evidently) vi Pon ‘puber ulent. Leaves numerous, neither tufted 
at the base no ee, very strongly reduced upwards, the lower broadly or n narrowly gular 
to asrnar ia ate o pac ia ar-cor ea "father ne -petiolate, the upper with a on Setioles 
r becoming sessile, efit relatively narrower and less e ae or scarcely triangular ; leaf-blades 
only 
tty 
¢ 
o 
n cm. w ge thed; heads few or rather 
numerous in a short, flat-topped Sndlove scence; involucre 7-10 mm. high, its principal bracts about 
13 or sometimes only 8, often black-tipped ; bracteoles few, narrow and cei somewhat elon- 
gate; rays mostly about 8, sometimes only 5, 7-13 mm. long; achenes glabrou 
Stream banks and other moist places in the mountains, Canadi ian and Hudsonian Zonkst Alaska and southern 
Yukon to ‘Scskateiewnn, northern Sioa ‘Mexice, and California; in all the higher mountains of our range, pero 
pad "oe iam also at lower elevations. Type locality : “Moist Prairies among the Rocky Mountains.’’ [Canada] 
ept 
Senecio triangularis var. angustifélius G. N. Jones, Univ. Wash. Pub, Biol. 5: 257. 1936. A rather small, 
slender form with relatively narrow leaves, the upper strongly reduced and oe pe often — ae lower- 
most ones triangular or subtriangular. Sphagnum bogs at low elevations near the t from Vanco sland 
to southern Oregon. Type ocality: Raft River, pity Fe paeahad County, Waskicin 
Senecio gibbénsii Greene, Pittonia 2: an. a Rags hologically similar to normal, fairly robust S. 
angularis and seemingly not to be separated from it ering markedly from that species in its heart oa 
worthy of further investigation. Salt marshes at the Hirai a the Euloestia River 3 in both Oregon and Washi 
9. Senecio sérra Hook. Tall Butterweed. Fig. 5750. 
Senecio serra Hook. Fl. Bor. Amer. 1: 333. 1834. 
Senecio andinus Nutt. Trans. Amer. Phil. Soc. II. 7: 409. 1841. 
Ss io | lat orr. & Gray. Fl. N. Amer. zs 440. 1843. 
Senecio serra var. integriusculus A. Gray, nord 1, N. Amer. 17: 287. 1884. 
Senecio serra Seer f andinus Rydb. Mem. N.Y. Bot. Gard. ts ie 00. 
Senecio serra [subsp.] Janceolatus Piper, Canty. U.S. Nat. Herb. 11: 601. 1906. 
Senecio millikeni stds Bot. Gaz. 41: 293. 1906 
Senecio serra var. altior Jepson, Man. FI. Pl. Calif. 1150. 1925. 
t, fibrous-rooted perennial 5-15 or 20 dm sie hte or ser ah ye hte especially 
pate a base; stems clustered. Leaves cont cas not tufted at the base uch reduced 
upwards, the lower mostly oblanceolate, short-petiolate ta deciduous, r ae 2 er = more 
nc 
petiole or petiolifo co i cm. wwiile d or occa- 
sionally subentire ; = numerous on slender — narrow, almost cylindric, the disk 
commonly only m. wide; involucre 6-8 mm. high, its bracts commonly about 8 or about 13, 
often Madi tisond ions oles few, a Si nae oon rather elongate; rays few, commonly 
about 5 or 8, 5-8 mm. long; — es glabro 
reat s and og open place the foot sila ons at moderate elevations in the mountains, in favorable aoa 
tat: 
base of the Caande Mountains ef shington, south t crag an nd wester n Wyom ng, Utah, moe nigel Cali 
n W s n 
10. Senecio crassulus A. Gray. Mountain Meadow Butterweed. Fig. 5751. 
Senecio crassulus A. Gray, Proc. Amer. Acad. 19: 54. 1883. 
Senecio crassulus var. cusickii (Piper) Greenm. ex M. E. Peck, Man. Pl. Oregon 780. 1941, without Latin diag- 
nosis, 
Glabrous, fibrous-rooted perennial a7 dm. tall from a short, erect or ascending caudex, this 
” branched and bearing several stems. Leaves thickish, entire to sharply dentate, the basal 
nes sorietiee larger than ose below, sometimes more or less strongly uced ; heads several 
(rarely s eee: & corsmbitorm, usually open inflorescence, the terminal head little if at all 
overto so. gt m. wide; re abou mm. high, s 
achenes 
In dry hell moist soil in open woods, meadows, and other open places from the foothills to uti high 
elevations: + in ae mountains, yea Fa = ig Hudsonian Zones; Sone Montana to nenthensperse Oregon south 
to South Dakota, New Mexico, and Utah. Type locality: mountains of Colorado. June-Aug 
