400 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Stems usually much branched, 30 to 90 em. 
high; herbage glabrous or glandular. 
Flowers small, 10 to 15 mm. broad.......-..-- 4. 
Flowers large, 20 to 40 mm. broad ......------ 4a. 
Perennials; stigmas subentire. 
Stems tall, 30 to 90 em. high. 
Leaves linear-oblong, sessile, nearly entire, the 
margins revolute ............------------- 6. 
eaves lanceolate to ovate, dentate or denticu- 
late, not revolute. 
Petals 6 to 10 mm. long; herbage canescent- 
puberulent......-.-----.------2------ 7. 
Petals 3 to 5 mm. long; herbage not canes- 
cent-puberulent. 
Capsule pedicelled. 
Pedicels shorter than the capsules; 
leaves ovate-lanceolate, petiolate 8. 
Pedicels equaling the capsules; 
leaves oblong-lanceolate. sessile, 
decurrent...........--.------- 9. 
Capsule sessile; leaves ovate or elliptic, 
sessile..._.......---------------- 10. 
Stems low; species mostly alpine or subalpine. 
Seeds smooth. 
Leaves entire; plants creeping or stolon- 
iferous. 
Stems ascending, usually curved; leaves 
spreading, oval or oblong, thick.... 11. 
Stems erect; leaves ascending, linear 
or oblong-lanceolate ........-.----- 12. 
Leaves or some of them toothed, thin. 
Flowers white, 5to6 mm. broad ...... 13. 
. Flowers purple, 10 to 15 mm. broad .. 14. 
Seeds papillate. 
Foliage glaucous and glabrous. ......-.-- - 15. 
Foliage not glaucous. ' 
Plants producing stolons. 
Leaves narrow, erect, keeled 
below.........--------------- 16. 
Leaves broader, spreading, not 
keeled. 
Matted; leaves firm, pale 
green, sessile... .. 2... --- 17. 
Not matted; leaves thin, 
bright green, petiolate... . - 14. 
Plants not producing stolons. 
Stems branched. 
Seeds 1 mm. long; stem pubes- 
cent in lines; pedicels about 
as long as the capsules .... 18. 
Seeds 2 mm. long; stems 
pubescent but not in lines; 
pedicels much shorter than 
the capsules .......2...-.. 19. 
E. paniculatum. 
FE. paniculatum 
jucundum. 
E. palustre. 
F. fraaciscanum. 
E.. adenocauton. 
E. halleanum. 
E. brevistylum. 
E. anagallidifoliun’. 
E. oreqonense. 
. alpinum. 
. hornemanni. 
my 
ies] 
. fastigiatum. 
E. pringleanum. 
FE. clavatum. 
E. hornemanni. 
F, leptocarpum. 
E. mirabile. 
