STANDLEY FLORA OF GLACIER PARK. 415 



Pappus white; achenes tapering toward the apex. 

 Pappus bristles hairy, dilated and chafflike at base .... 5. PTILOCALAIS. 



Pappus bristles not hairy, slender throughout 6. CREPIS. 



Pappus yellowish or brownish; achenes not tapering. 

 Leaves not at all triangular, \vithout lobes at the base; flowers white or yellow; 



plants hairy 7. HIERACITJM. 



Leaves more or less triangular, with lobes at the base; flowers white; plants 

 glabrous 8. PRENANTHES. 



1. AGOSERIS Raf. False dandelion. 



Perennials with naked stems; leaves clustered at the base of the stem, entire, 

 toothed, or lobed; heads solitary, large; flowers yellow or bronze, often turning pur- 

 plish; pappus of slender white bristles. — It is necessary to have mature achenes in 

 order to distinguish the species accurately. The species are difiicult to distinguish, 

 and poorly understood; it is doubtful whether all those listed below are valid. 

 Beak of the achene slender, nearly or fully as long as the body of the achene, scarcely 

 ridged at the middle; flowers often bronze or orange. 



Leaves finely hairy 1. A. elata. 



Leaves glabrous or nearly so. 



Leaves with few or numerous narrow lobes 2. A. graminifolia. 



Leaves entire or slightly toothed 3. A. gracilens. 



Beak short, ridged its whole length; flowers yellow. 

 Leaves finely hairy. 

 Outer bracts mostly oblong or oblong-ovate; leaves mostly entire . 4. A. villosa. 



Outer bracts linear-lanceolate; leaves mostly lobed 5. A. aspera. 



Leaves glabrous or nearly so. 



Bracts glabrous oft the back; leaves linear or nearly so 6. A. glauca. 



Bracts hairy on the back; leaves linear or broader. 

 Leaves acute; outer bracts not much broader than the inner ones; plants mostly 



20 to 40 cm. high 7. A. scorzoneraefolia. 



Leaves obtuse; outer bracts much broader than the inner ones; plants mostly 

 5 to 15 cm. high 8. A. pumila. 



1. Agoseris elata (Nutt.) Greene. Occasional about the foot of Lake McDermott, 

 on sandbars or open rocky slopes. B. C. to Calif., Colo., and Mont. — Leaves oblance- 

 olate or nearly linear, lobed or toothed or some of them entire, green; stems stout, 

 30 to 50 cm. high, .hairy; bracts hairy; flowers yellow or sometimes orange. 



2. Agoseris graminifolia Greene. Frequent at middle and high altitudes, in 

 meadows, on rocky slopes, or occasionally in woods; sometimes found above timber 

 line on rock slides. B. C. and Alta. to Ariz. — Leaves linear, green, usually very 

 numerous; stems 15 to 40 cm. high, hairy above; heads 2 cm. high, narrow; flowers 

 bronze, turning purplish. 



3. Agoseris gracilens. (A. Gray) Kuntze. Frequent at low altitudes on the east 

 slope, on open hillsides or in thickets; sometimes in meadows above timber line. 

 B. C. and Alta. to Colo. — Leaves oblanceolate, mostly entire, green or rather pale, 

 obtuse or acute; stems 15 to 50 cm. high, hairy below the head; heads broad, about 

 2 cm. high; flowers orange or bronze, turning purplish. 



4. Agoseris villosa Rydb. Frequent on the east slope at low, middle, and high 

 altitudes, on rock slides or open slopes or in woods or thickets. B.C. and Alta. to 

 Utah. (Troximon villosum A. Nels.) — Leaves lanceolate or oblanceolate, 6 to 12 cm. 

 long, pale, acute; stems stout, 10 to 40 cm. high, hairy; heads broad, about 2 cm. 

 high. 



The plants from alpine localities are rarely much over 10 cm. high. 



