STANDLEY FLOE A OF GLACIER PARK. 425 



12. Aster fremontii (Torr. & Gray) A. Gray. Low thickets at east entrance. B. C. 

 and Alta. to Colo, and Utah. {A. uvihacldi Rydb.) — Plants stout, 20 to 60 cm. high, 

 nearly glabrous, very leafy; leaves 3 to 10 cm. long, entire; heads few or numerous; 

 rays purple, 7 to 10 mm. long. 



13. Aster oreganus Nutt. Frequent at low altitudes, in swamps or bogs or in low 

 thickets. B. C. to Nev. and Mont. — Stems slender, 20 to 70 cm. high, nearly glabrous; 

 leaves linear-lanceolate, 8 to 8 cm. long, sessile, bright green, entire; panicles very 

 leafy; rays lavender or pinkish. 



14. Aster frondeus (A. Gray) Greene. Common aearly everywhere, in woods or 

 thickets or on open slopes; frequent above timber line. B. C. and Alta. to Colo. — 

 Plants 15 to 90 cm. high, nearly glabrous; leaves mostly oblanceolate, 5 to 15 cm. 

 long, entire; ray f? purple. 



The commonest aster of the park, flowering nearly throughout the summer. The 

 plants are somewhat variable and many of the forms have been separated as species. 

 Those growing above timber line are usually only 10 to 20 cm. high; this form ia 

 A. apncus (A. Gray) Rydb., but it differs from A. frondeus only in size. 



8. ERIGERON L. Fleabane. 



Perennials or occasionally annuals; leaves alternate, sometimes all at the base of 

 the stem, entire, toothed, or lobed; heads small or large, usually with showy rays, 

 these white, pink, or purple; pappus of slender bristles. 



Rays inconspicuous, erect or nearly so, usually inrolled from the sides; leaves entire 

 Heads only 3 to 4 mm. broad; lower leaves often toothed ....I.E. canadensis. 

 Heads 7 to 12 mm. broad; leaves entire. 



Heads many on each stem; plants mostly 20 to 40 cm. high 2. E. acris. 



Heads usually 1 or 2 on each stem; plants mostly 5 to 15 cm. high. 



Heads not black-hairy . . ; 3. E. jucundus. 



Heads densely black-hairy 4. E. unalaschkensis. 



Rays conspicuous, long and spreading; in one species the rays sometimes wanting, 

 but the leaves deeply lobed. 



Leaves divided into linear lobes 5. E. compositus. 



Leaves entire or toothed . 



Stems low, usually less than 15 cm. high, each with a single head. 



Rays white 6. E. caespitosus. 



Rays pink or purple. 

 Bracts densely woolly with soft hairs. 



Lowest leaves very hair>', often 3-toothed 7. E. lanatus. 



Lowest leaves glabrous or nearly so, entire 8. E. uniflorus. 



Bracts glabrous or with glands or with short stiff hairs. 



Leaves glabrous or nearly so; bracts not hairy 9. E. leiomerus. 



Leaves hairy; bracts short-hairy 10. E. nanus. 



Stems tall, usually 20 to 60 cm. high or more, sometimes low but each stem then 

 with 2 or more heads. 

 Rays white or pink. 



Stems Avith fine, closely appressed hairs 11. E. ramosus. 



Stems with short or long spreading hairs. 



Heads about 1.5 cm. broad; bracts Avith long loose hairs ... 13. E. asper. 



Heads 1 cm. broad or less; bracts with short, often close hairs. 



Leaves entire; plants in clumps, less than 20 cm. high. 6. E. caespitosus. 



Leaves mostly with low teeth; plants not in clumps, usually 30 to 50 cm. 



high 12. E. philadelphicus. 



