328 COMPOSITE. Erigeron. 



or purplish (about 3 lines long) : appendages of the style extremely short and 

 obtuse : akenes 2 - 3-nerved, minutely hairy : the short squamellate outer pappus 

 conspicuous. 



Var. tenerum, Gray. Slender and small, with weaker stems and small heads ; 

 involucre only 2 lines high, less hirsute. 



Eastern side of the Sierra Nevada : thence to the Rocky Mountains and New Mexico. The 

 only genuine form collected on the borders of the State is from Carson City, Dr. Anderson. — 

 Var. leneruni, summit of Silver Mountain near Ebbett's Pass, alt. 11,000 feet, Brewer. Also col- 

 lected by Watson on Star Peak, N. W. Nevada, at 9,000 feet. 



At Mono Pass, around rocks, Dr. Bolander collected a plant which would appear to belong to 

 E. ccespitosam, although with rather longer and narrower leaves : but the pappus appears to be 

 simple. 



6. E. Nevadense, Gray. Slightly hoary with fine mostly appressed roughish 

 pubescence : stems erect or ascending from long and slender subterranean rootstocks, 

 a span to a foot high, simple, leafy below, mostly naked above or scape-like, bearing 

 a solitary large head : leaves linear-lanceolate or spatulate-linear, narrowed below, 

 the lowest into a petiole (the whole 2 to 6 inches long), the cauline acute, the 

 uppermost reduced to subulate bracts : involucre hirsute, also minutely glandular ; 

 the scales mostly equal (4 lines long) : rays 25 to 30 in a single series, rather 

 broadly linear, white, 3 or 4 lines long : style-appendages ovate and acute : akenes 

 minutely pubescent, flat, oblong, 2-nerved, or some of the outer 3-nerved (2 lines 

 long) : the short setiform outer pappus scanty and inconspicuous. — Proc. Am. 

 Acad. viii. 649. E. ccespitosum, var. grandijiorurn, Eaton in Bot. King Exp. 153, 

 in part (viz. No. 548), not of Torr. & Gray. 



Var. (?) pygmaeum, Gray, 1. c. Dwarf and densely cespitose : leaves spatulate- 

 linear (half an inch or less than an inch long, barely a line wide at the summit), 

 crowded on the rootstocks : flowering stems nearly naked and scape-like, an inch or 

 two high : heads much smaller : rays narrower, barely 3 lines long, purple. 



Sierra Nevada : Mount Stanford and Sierra Valley (Bolander, Kellogg, Lemmon) ; and in 

 Nevada, Cedar Hill and on Mount Davidson (Bloomer), and West Humboldt Mountains, Watson. 

 Var. pygmaeum, Ebbett's and Mono Pass, alt. 9,500 to 10,750 feet, Brewer. 



E. argentatum, Gray, 1. c, which S. Watson collected on the foot-hills of the Pah-Ute 

 Mountains in Nevada, may be known by the fine silvery-silky foliage, soft-pubescent several- 

 nerved akenes, and conspicuous outer pappus. E. canum, Gray, has glabrous, narrow, several- 

 ribbed akenes. 



7. E. Bloomeri, Gray. Somewhat hoary with minute appressed pubescence : 

 leafy stems short and tufted on the thickish rootstock : leaves crowded, filiform- 

 linear, or the broadest spatulate-linear tapering into a filiform petiole, 1 or 2 

 inches long : flowering stems erect, naked and scape-like at least above the middle, 

 a span high, bearing a solitary head : involucre somewhat campanulate (4 or 5 lines 

 high), villous ; the scales equal : rays none : style-appendages acute : akenes minutely 

 pubescent, flat, oblong-linear, and with only marginal nerves (2 lines long) : pappus 

 simple. — Proc. Am. Acad. vi. 540 ; Eaton in Bot. King Exp. 1 48. 



Sierra Valley (?) Bolander. Virginia and Carson City (Bloomer, Anderson), and W. Nevada, 

 Watson. Allied to the foregoing ; with foliage nearly of the following. 



8. E. cchroleucum, Nutt. Minutely somewhat hoary with a fine appressed 

 hirsute pubescence, or glabrate : leaves very narrowly linear and tapering to the 

 base or nearly filiform, mostly crowded on the rootstocks, one or two inches long, 

 the cauline rather few and scattered : flowering stems slender, about a span high, 

 naked at summit, bearing solitary or rarely 2 or 3 heads : involucre more or less 

 hirsute (barely 3 lines high) ; the scales rather rigid : rays 30 or 40, cream-color or 

 white (2 or 3 lines long) : akenes minutely pubescent, 2 - 3-nerved : pappus plainly 

 double, the outer of very short subulate squainelke. 



Sierra Nevada near Summit ; thence eastward and northward nearly to British Columbia. The 

 forms with leafy stems approach the next. 



