SEGREGATES FROM SIEVERSIA. 179 
cence, longer and more pilose hairs altogether few and obsure: 
leaflets less than 4 inch long, cuneiform, mostly not cleft and 
equally tridentate at summit, others bifid and with 3 teeth on 
one lobe, 2 on the other: calyx-segments triangular-lanceolate, 
very acute, surpassed by the linear bractlets, 
Subalpine slopes of the San Francisco Mountains, northern 
Arizona, J. B. Leiberg, 25 June, 1901. Type in U. S. Herb. 
E. Artzonica. Much larger than the last, the foliage ample, 
of thin texture and pale, but as if glaucescent, not hoary with 
pubescence, the hairiness rather sparse, long and pilose though 
appressed : leaflets an inch long, obovate-cuneiform, commonly 
cleft into 3 to 5 unequal segments, each rather unequally 2 or 
3-toothed : calyx-segments triangular-lanceolate, attenuate-acu- 
minate, much surpassed by the linear long-attenuate bractlets: 
plume 13 inches long, nearly colorless. 
Hillsides and summits of the region about the San Francisco 
Mountains, Ariz., MacDougal’s n. 65 from about Mormon Lake, 
and Rusby’s from Bill Williams Mountain being typical. 
E. TRIDENTATA. Tall as the last, the foliage of similarly 
glaucescent hue but also distinctly though not densely villous- 
pilose, the leaf-segments or leaflets cuneate and cleft only at the 
apex or not at all, many being simply tridentate at apex: flowers 
large, long-peduncled : calyx-segments lanceolate, attenuate-acu- 
minate, hardly surpassed by the narrow-linear bractlets; petals 
spatulate-oblong, subtruncate, mucronate: plume 1% inches 
long. 
Willow Spring, White Mountains, Ariz., Edw. Palmer, June, 
1890, n. 506. 
E. ALIENA. Low, with small leaves and remarkably stout 
stem 6 or 8 inches high: leaflets of the small leaves when grown 
almost glabrous above, strongly pilose-ciliate, the lower face 
sparsely pilose, all short, broadly cuneate, not cleft but only 3 to 
5-toothed near the summit: flowers small, the low-hemispherical 
calyx-tube singularly turgid, even obscurely 5-saccate ; segments 
short, ovate-lanceolate, merely acute, the bractlets small, about 
equalling the segments: fruit not seen. 
Sierra Madre, Chihuahua, at 7,500 feet, 6 June, 1899, Town- 
send & Barber, n. 15 as in U. S. Herb, 
