400 CONTRIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



Stems usually much branched, 30 to 90 cm. 

 high; herbage glabrous or glandular. 



Flowers small, 10 to 15 mm. broad 4. E. fanicnlatunt. 



Flowers large, 20 to 40 mm. broad 4a. E. paniculatum 



jucundum. 

 Perennials; stigmas subentire. 

 Stems tall, 30 to 90 cm. high. 



Leaves linear-oblong, sessile, nearly entire, the 



margins revolute 6. Z?. palustre. 



ijeaves lanceolate to ovate, dentate or denticu- 

 late, not revolute. 



Petals 6 to 10 nmi. long; herbage canescent- 



puberulent - . . . 7. E. fnwciscanum. 



Petals 3 to 5 mm. long; herbage not canes- 

 cent-puberulent. 

 Capsule pedicelled. 



Pedicels shorter than the capsules; 



leaves ovate-lanceolate, petiolate 8. E. adniocaulon. 

 Pedicels ecjualing the capsules; 

 leaves ol)long-lanceolate. sessile, 



decurrent 9. E. halJeanum. 



Capsule ses.sile; leaves ovate or elliptic, 



sessile IQ. E. hrtvisti/lum. 



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. i^. anagaUidifolium. 



Stems erect; leaves ascending, linear 



or oblong-lanceolate . 12. E. oregonense. 



Leaves or some of them toothed, thin. 



Flowers white, 5 to 6 mm. broad 13. £■. alfinwn. 



Flowers purple, 10 to 15 mm. broad . . 14. E. hornemanni. 

 Seeds papillate. 



Foliage glaucous and glabrous 15. E. fast'ujiatum. 



Foliage not glaucous. 



Plants producing stolons. 



Leaves narrow, erect, keeled 



below 16. E. pringleanum. 



Leaves broader, spreading, not 

 keeled. 



Matted; leaves firm, pale 



green, sessile 17. E. elnrntum. 



Not matted; leaves thin, 



bright green, petiolate 14. E. /loriietnanni. 



Plants not producing stolons. 

 Stems branched. 



Seeds 1 mm. long; stem pubes- 

 cent in lines ; pedicels about 

 as long as the capsules .... 18. Z?. leptocarpum. 

 Seeds 2 mm. long; stems 

 pubescent but not in lines; 

 pedicels much shorter than 

 the capsules 19. E. mirahile. 



