STANDLEY FLORA OF GLACIER PARK. 435 



Basal leaves lanceolate or oblanceolate, short-stalked. 

 Stems with numerous pairs of leaves, the upper leaves not much reduced. 



9. A. foliosa. 

 Stems with 1 to 3 pairs of leaves, the upper ones much reduced. 



Heads campanulate, covered with viscid hairs; piante of low altitudes. 



10. A. fulgens. 

 Heads turbinate, hairy but not viscid; plants of alpine situations. 



Leaves glabrous or thinly hairy, green 11. A. alpina. 



Leaves densely covered with long soft whitish hairs . . 12. A. tomentosa. 



1. Arnica parryi A. Gray. Rayless arnica. Aspen thicket at east entrance; 

 moist open hillside on trail to Iceberg Lake. B. C. to Oreg., Colo., and Alta. ^Sterns 

 hairy, leafy, 20 to 50 cm. high ; basal leaves ovate or oblong, entire or slightly toothed, 

 hairy; heads 3 to 9, 12 to 15 mm. high, dull yellow; pappus brownish. 



2. Arnica longifolia D. C. Eaton. Frequent, especially at low and high altitudes, 

 in alpine meadows, in wet thickets, or on open slopes. Wash, to Calif., Colo., and 

 Mont. — Plants often tufted, very viscid, 25 to 60 cm. high; leaves mostly linear- 

 lanceolate, 5 to 15 cm. long, bright green, minutely hairy, sessile; heads few, about 

 1 cm. high. 



3. Arnica mollis Hook. Common at low and middle altitudes, in damp woods or 

 wet thickets, along streams, on open slopes, or in bogs; frequently found in wet mead- 

 ows above timber line. B. C. and Wash, to Colo, and Alta. — Plants green, hairy, 20 

 to 60 cm. high, often forming dense clumps; stem leaves sessile, 4 to 10 cm. long; 

 heads 1 to 5, 12 to 15 mm. high. 



4. Arnica diversifolia Greene. Moist rocky slopes at Sexton Glacier, and perhaps 

 elsewhere. B. C. to Calif., Mont., and Alta. — Plants25 to 50 cm. high, finely glandular- 

 hairy, basal leaves usually toothed, the stem leaves ovate to lanceolate, sessile; 

 heads 1 to 5. 



6. Arnica cordifolia Hook. Collected in thickets at east entrance by Umbach; 

 also obtained by Williams at Columbia Falls, and probably to be found about Belton. 

 B. C. to Calif., N. Mex., and Alta. — Stems hairy, 20 to 50 cm. high; basal leaves 

 broadly heart-shaped, 3 to 10 cm. long, usually toothed; stem leaves 2 to 4 pairs, 

 mostly stalked; heads 1.5 to 2 cm. high, hairy. 



6. Arnica gracilis Rydb. Abundant near and above timber line, in wet meadows 

 or on open slopes or rock slides; occasionally found in wet thickets at middle altitudes. 

 B. C. and Wash, to Wyo. and Alta. — Stems 10 to 50 cm. high, glabrous or nearly so; 

 basal leaves ovate to rounded, toothed or entire, 2 to 6 cm. long; stem leaves 2 to 4 

 pairs, the lower ones stalked; heads 1 to 5. 



7. Arnica latifolia Bong. Abundant on the east slope at low and middle altitudes, 

 usually in deep woods. Alaska to Utah and Colo. — Stems 30 to 70 cm. high; basal 

 leaves heart-shaped, 5 to 15 cm. long, toothed, finely hairy or nearly glabrous; heads 

 usually 5 to 9; bracts minutely glandular and sometimes hairy. 



Very abundant and showy about Lake McDermott, often forming large dense patches 

 in the woods. The plants bloom in the early summer and do not remain in flower long. 



8. Arnica granulifera Rydb. Frequent in alpine meadows; sometimes in woods at 

 middle altitudes. Mont. — Stems 25 to 35 cm. high, somewhat hairy; basal leaves 

 ovate, usually absent at flowering, slightly toothed; stem leaves broadly ovate, 4 to 9 

 cm. long, toothed, obtuse; heads 1 to 5. 



9. Arnica foliosa Nutt. Frequent on the east slope at low altitudes, in wet meadows 

 or thickets, in aspen woods, or about low places on prairie. Alaska to Utah and Colo. — 

 Stems 20 to 60 cm. high, woolly; leaves linear or linear-lanceolate, densely and finely 

 hairy, 5 to 10 cm. long, usually entire, the lower ones slender-stalked; heads 1 to 7, 

 8 to 10 mm. high, often woolly. 



2048—21 14 



