STANDLEY — FLORA OF GLACIER PARK. 335 



3. CERASTIUM L. Mouse-ear chickweed. 



Perennials, ^\-ith viscid pubescence; flowers in cymes; petals white; stamens 10; 

 capsule opening by 10 small teeth. 



Leaves linear, acute 1- C. strictum. 



Leaves oblong to oval, obtuse or acutish. 



Petals scarcely if at alllonger than the sepals 2. C. vulgatum. 



Petals much longer than the sepals. 



Sepals 7 to 8 mm. long; petals about 10 mm. long 3. C. alpinum. 



Sepals 4 to 5 mm. long; petals 6 to 8 mm. long 4. C. beeringianum. 



1. Cerastium strictum L. Common at nearly all altitudes but most abundant 

 above timber line, in moist meadows, woods, or thickets, or on open slopes or rock 

 elides. B. C. and Wash, to Colo, and S. Dak.; also in Eur. and Asia.— Stems tufted, 

 10 to 30 cm. long, finely hairy; leaves 1 to 2 cm. long; sepals about 5 mm. long; 

 petals about twice as long as the sepals. 



Perhaps only a form of C. arvense L. 

 f 2. Cerastium vulgatum L. Frequent on the west slope at low altitudes, in gardens 

 or waste ground and along trails. Native of Eur. and Asia; adventive in N. Amer.— 

 Stems ascending, 10 to 30 cm. long; leaves 1 to 3 cm. long; sepals 5 mm. long. 



3. Cerastium alpinum L. Frequent above timber line, on rocky slopes and rock 

 slides. Alaska to Mont., Que., and Greenl.; also in Eur. and Asia.— Stems ascending, 

 10 to 20 cm. long; leaves 0.5 to 2 cm. long; cymes 2 or 3-flowered or the flowers often 

 solitary. 



4. Cerastium beeringianum Cham. & Schlecht. At nearly all altitudes, but most 

 abundant above timber line, in meadows, on rock slides, or along streams and lakes. 

 Alaska to Ariz., Alta., and Que.— Stems clustered, ascending, 5 to 20 cm. long, very 

 viscid ; leaves 0.5 to 2 cm. long. 



This species is doubtfully distinct from C. alpinum. 



4. STELLARIA L. Chickweed. 

 Annuals or perennials, glabrous or pubescent; leaves broad or narrow; sepals 5; 

 petals 5 or wanting, deeply 2-lobed, white. 



Plants with fine gland-tipped hairs 1- S. americana. 



Plants without gland-tipped hairs, usually glabrous. 

 Bracts of the inflorescence, at least the uppermost, scarious, whitish. 



Petals as long as the sepals or slightly longer 2. S. longipes. 



Petals minute or none. 



Leaves oblong-lanceolate; pedicels reflexed in age 3. S. umbellata. 



Leaves linear; pedicels ascending 4. S. alpestris. 



Bracts all green, never scarious. 



Leaves linear or lanceolate, more than 4 times as long as broad. 



Petals minute or usually none 5. S. borealls. 



Petals as long as the sepals. 



Leaves bluish green; plants less than 10 cm. high 6. S. laeta. 



Leaves bright green; plants usually more than 10 cm. high. 



7. S. crassifolia. 

 Leaves lance-ovate to broadly ovate, less than 4 times as long as broad. 



Leaves long-petioled • 8. S. media. 



Leaves sessile or nearly so. 



Sepals acute , 9- S. crispa. 



Sepals obtuse 10. S. obtusa. 



