SBGREQATKS FROM SIEVEB8IA. 179 



ceace, longer and more pilose hairs altogether few and obsure : 

 leaflets less than i inch long, cuneiform, mostly not cleft and 

 equally tridentate at summit, others bifid and with 3 teeth on 

 one lobe, 3 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. Arizonica. Muchlarger 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 IJ 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 Eusby's from Bill Williams Mountain being typical. 



E. TRIDENT ATA. 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 IJ 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, Towpr 

 s^nd & Barber, i^. 15 as in TJ. S. He^-b, 



