98 
resembling the bractlets but smaller, much shorter than the long 
styles. 
Mostly in marshes; throughout Caiifornia^(6^reene, Lemmon 108, O. R. 
Vasey 223 and distributed as vav. armaium, Cleveland, etc.) 
The species varies greatly in size, and in drier places it passes into the 
dwarfed 
Var. minimum, which is but 1 to 3 inches high, with all 
parts correspondingly reduced, and bracts about as long as the 
heads. 
Donner Lake {C. F. Sonne). 
12. E. discolor Watson, Proc. Am. Acad, xviii. 193. Stem 
erect, slender, 1 to 2 feet high, bearing a single head (rarely 
more) : radical leaves on veiy long petioles, oblong to narrowly 
oblanceolate, thin, slightly ci'enate; stem leaves few, sessile, linear- 
lanceolate, acutely or spinosely-toothed : head ovate-oblong (about 
6 lines long), with involucre of numerous linear-lanceolate spinose- 
tipped bracts (white within and green without) longer than the 
heads and entire or sparingly spinose-toothed ; bractlets narrow, 
with a long spinose acumination; fruit with ovate abruptly cuspi- 
date-tipped calyx-lobes and long slender styles. 
Growing in water, at Cienega, Huachuca Mts., S. Arizona {Lemmon, in 
1882); also in S. W. Chihuahua, Mexico (Palmer 397). FI. August to 
November. 
* * * 5^ Simple to diffuse : leaves coriaceous, lobed or parted, 
spinosely tipped: southern (except the first two species). 
13. E. articulatum Hook. Lond. Journ. Bot. vi. 232. Erect, 
a foot or so high (rarely prostate), more or less branching through- 
out: radical and lower stem leav^es reduced to very long (some-- 
times a foot long) jointed petioles with or without a small lanceo- 
late blade (from entire to laciniately toothed) ; upper stem leaves 
sessile: involucre of linear cuspidate-tipped and spiny-toothed 
bracts ( about 6 lines long) much longer than the heads; bractlets 
tricuspidate, the middle one much the largest, scarcely longer than 
the flowers: fruit with lanceolate cuspidate-acuminate calyx-lobes 
hardly longer than the styles. — E. petiolahini var. juncifolimn 
Gray, Proc. Am. Acad. viii. 385. 
Swamps and wet meadows, California, San Simeon (M. K. Curran), 
Plumas county (Mrs. R. M. Austin); Oregon {Nuttall, Hall 200, Howell, 
