>j2 The Ottawa Naturalist. |J u 'y 



A. chloraxtha, Greene, Ott. Nat. xviii. 38. This was ori- 

 ginally described from specimens of the year 1901, and much 

 loo young. The numbers 69,353 an d 69,354 of 1905 together 

 enable one to complete the description of what is a most satisfac- 

 tory species. In its maturity, as shown in n. 69,354, collected 

 August, 1905, the plant is 7 to 9 inches high, the involucres not 

 sessile, but even quite loosely corymbcse-panicled and about 

 twice as numerous as in the originals. The achenes are dis- 

 tinctly though sparsely scabro-hirtellous. 



A. erigeroides. Slender but rather rigid and wiry, the flow- 

 ering stems 8 to 1 2 inches high : stolons with small foliage narrow- 

 ly spatulate-oblanceolate, compactly silky-lanate on both faces, 

 the upper glabrate only in age; stem leaves narrowly linear- 

 falcate, sharply acuminate, all but the uppermost curving away 

 from the stem ; heads distinctly racemose, a few at the very sum-- 

 mit only more crowded and subcymose ; pedicel's of the scattered 

 and racemose ones filiform, 1-2 to 1 inch long and suberect ; 

 scaricus tips of the involucral bracts all obtuse, pinkish : stamin- 

 ate plant not known. 



Skagit Valley, 27 June, 1905, at an altitude of 4,500 feet, 

 Mr. Macoun ; Geo. Surv. , n. 69,346. 



A. modesta. Low, the leafy and floriferous stems only 2 to 

 4 inches high and almost filiform, either monocephalous or 

 with several additional heads on slender pedicels racemosely ar- 

 ranged : stolons short, crowded, densely leafy, their leaves 1-2 

 inch long or less, oblong-cuneiform, densely whitish-tomentose 

 on both faces ; stem-leaves thin, oblong, acute, suberect, more 

 loosely woolly and the wool deciduous from the upper face, the 

 slender stem itself and the pedicels floccose and the wool deci- 

 duous, or partly so; involucres small, narrow-campanulate, the 

 bracts dark and brownish, their tips long, acuminate, greenish- 

 brown. 



Altitude of 6000 feet in Skagit Valley, 25 July, 1905, Mr. 

 Macoun. Plant cf the .1. alpina group by its involucre but of 

 peculiar habit and a subracemc.se inflorescence. 



Washington, D. C., June, 1906. 



