362 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



20 to 40 cm. high, slightly hairy, with long rootstocks; leaflets 5 or 7, oval or elliptic, 



5 to 8 cm. long, pale beneath; calyx enlarging in fruit and becoming purplish; petals 



about half as long as the sepals; fruit of achenes on a receptacle, this becoming large 



and spongy. 



5. DRYMOCALLIS Fourr. 



Perennial herbs with viscid pubescence; leaves pinnate, the leaflets broad, deeply 

 toothed; flowers in cymes; petals cream-colored or pale yellow; fruit of numerous 

 small achenes. 



Petals about as long as the sepals; plants usually 30 to 60 cm. high . 1. D. glandulosa. 

 Petals much longer than the sepals; plants usually 15 to 20 cm. high. 



2. D. pseudorupestris. 



1. Drymocallis glandulosa (Lindl.) Rydb. Common on the east slope at low and 

 middle altitudes, in woods or thickets or on open hillsides. B. C. to Calif., N. Mex., 

 and S. Dak. — Plants very hairy and viscid; leaflets 7 or 9, green, 1.5 to 4 cm. long, 

 coarsely toothed and often lobed. 



2. Drymocallis pseudorupestris Rydb. Frequent at middle and high altitudes, 

 on open rocky slopes or rock slides, sometimes in woods. Alta. to Idaho and Wyo. — 

 Plants hairy and viscid, usually tufted ; leaflets 7 or 9, 1 to 3 cm. long; flowers 1.5 to 2 



cm. broad. 



6. FRAGARIA L. Strawberry. 



Perennial, with long runners; leaves basal, the 3 leaflets broad, toothed; petals 

 white, obtuse; fruit of numerous seedlike achenes on a fleshy red receptacle. 

 Plants green, not glaucous; teeth of the leaflets usually acute .... 1. F. bracteata. 

 Plants pale and somewhat glaucous; teeth of the leaflets rounded or obtuse. 



Hairs of the petioles appressed 2. F. glauca. 



Hairs of the petioles spreading 3. F. platypetala. 



1. Fragaria bracteata Heller. Frequent, especially on the west slope, at low and 

 middle altitudes, in woods or thickets. B. C. to Calif., N. Mex., and Mont. — 

 Pubescence mostly of spreading hairs; leaflets thin, 2 to 6 cm. long, pale beneath; 

 petals about twice as long as the sepals. 



2. Fragaria glauca (S. Wats.) Rydb. Frequent at low and middle altitudes, 

 sometimes near timber line, in woods or thickets or on open slopes. B. C. to N. Mex. 

 and S. Dak. — Leaflets rather thick, 3 to 5 cm. long, coarsely toothed, silky-hairy 

 beneath or nearly glabrous; flowers 1.5 to 2 cm. broad. 



3. Fragaria platypetala Rydb. Occasional in woods or thickets at middle altitudes, 

 and sometimes above timber line. Alaska to Calif., Wyo., and Mont. — Leaflets 

 rather thick, 2 to 6 cm. long, silky-hairy beneath; flowers 1.5 to 2 cm. broad. 



7. SIBBALDIA L. 



1. Sibbaldia procumbens L. Common above timber line, in meadows and on rock 

 slides; occasionally found at lower altitudes, a few plants even at the east entrance. 

 Alaska to Calif., N. Mex., N. H., and Greenl.; also in Eur. and Asia. — Perennial 

 with short rootstocks, 10 cm. high or less, somewhat hairy; leaves slender-stalked, 

 the 3 narrow leaflets 1 to 3 cm. long, 3 to 5-toothed near the end; flowers few, in 

 dense cymes; petals yellow, shorter than the sepals; fruit of small achenes. 



The plant often forms dense carpets in alpine meadows. 



8. DRYAS L. Dryad. ' , 



Low prostrate shrubs, forming dense mats; leaves petioled, with low rounded 

 teeth, thick and leathery, white-woolly beneath; flowers solitary on naked stems; 

 Sepals and petals each 8 or 10; fruit of numerous achenes, each with a long hairy tail. 



