162 ONAGRACEAE 



P'lowers 3-5 mm. long. 



Leaves all except the uppermost, short-petioled. 



Seeds pellucid-apiculate; leaves not very thin; pods strongly- 

 ascending or nearly erect. 

 Innovations by rosettes. 



Leaves narrowly lanceolate, pale green; corolla white. 



8. E. americanum. 

 Leaves broadly lanceolate, not pale; coroUa usually pink. 



9. E. adenocauUm. 

 Innovations by turions. 10. E. laiiusculum. 



Seeds not apiculate; leaves very thin; pods ascending-spreading. 



11. E. MacDougalii. 

 Leaves all sessile or only the very earliest sometimes short-petioled. 



Leaf-blades rounded at the base, broadly lanceolate to ovate. 

 Petals purple, 5-8 mm. long, leaf-blades usually ovate. 



5. E. ovatifoHum. 

 Petals white, 4 mm. long; leaf-blades lanceolate. 



12. E. rubescens. 

 Leaf-blades acute at the base. 



Petals white or rarely pale pirik. 



Leaf-blades ample, ovate or broadly lanceolate. 



Plant tall, 3-6 dm. high; pod and inflorescence more 



or less glandular. 13. E. stramineum. 



Plant 1-2 dm. high; whole plant perfectly glabrous, ex- 

 cept the slightly crisp-hairy decurrent Unes. 



14. E. saximontanum. 

 Leaf-blades narrowly lanceolate, almost erect ; plant slender, 

 1-3 dm. high. 15. E. Drummondii. 



Petals pihk-purple. 16. E. delicaium. 



Plants with stolons or soboles, low, 1-2 (seldom 3) dm. high; leaf-blades oval 

 or oblong, indistinctly denticulate. 

 Leaves more or less distinctly petioled. 



Petals white; plant 1-3 dm. high, stoloniferoiis. 17. E. alpinum. 

 Petals purple or pink. 



Plant 1-3 dm. high, soboliferous ; flowers 5—7 nun. long. 



18. E. Jlornemannii. 

 Plant usually less than 1 dm. high, stoloniferous; flowers less than 



5 mm. long. 

 Flowers nodding in the bud: pods cylindric; seeds smooth. 



19. E. anagallidi folium. 

 Flowers a.scending in the bud; pods somewhat clavate; seeds 



papillose. 20. E. clavatum. 



Leaves sessile; plant glabrous up to the hypanthium. 



Stem somewhat angled by the decurrent lines; plant stoloniferous; 

 leaves oblong or linear, less than 1.5 cm. long. 



21. E. oregonense. 

 Stem terete, without decurrent lines; plant more or less glaucous, 

 soboliferous. 

 Stem-leaves linear-lanceolate. 22. B. glaberrimum. 



Stem-leaves ovate or ovate-lanceolate. 23. E. platyphyllum. 



Leaves narrow, linear or linear-oblong, entire or minutely denticulate; capsule 

 cinereous. 

 Innovations of long subterranean shoots, bearing at their ends ovoid turions; 

 petals white. 

 Leaves and lower part of the stem glabrous. 24. E. wyomingense. 



Leaves and stem crisp-pubescent. 25. 'E. lineare. 



Innovations leafy rosettes; petals pale; leaves 5-15 mm. long. 



26. E. davuricum. 

 Annuals with more or less shreddy, straw-colored bark ; stigma 4-cleft. 



Seeds smooth; stem more or less strigose or crisp-hairy, not viscid; leaves lance- 

 eUiptic; calyx (with the tube of the hypanthium) about 2 mm. long. 



27. E. Lindleyi. 

 Seeds muriculate; stem glabrous throughout or glandular above; leaves linear or 



narrowly linear-lanceolate; calyx usually over 2 mm. long. 

 Tube of the hypanthium funnelform, 1-3 mm. (rarely 4 mm.) long. 



Petals white, only slightly exceeding the calyx, 2-3 mm. long; capsule 



glabrous; tube of hypanthium 1-1.5 mm. long. 28. E. Tracyi. 

 Petals pink or purple, 3.5-7 mm. long, about twice as long as the calyx. 

 Capsule and pedicels glabrous or sparingly puberulent. 



Leaves and bracts very thick, homy at the apex, the latter very 



short; capsule glabrous; pedicels short. 29. E. subulatum. 

 Leaves and oracts not very thick, not horny at the apex; capsule 

 usually puberulent, at least when young; pedicels slender. 



30. E. paniculalum. 

 Capsule and pedicels glandular-pubescent; pedicels very short. 



31. E. adenocladon. 

 Tube of the hypanthium 4-8 mm. long, cylindric or nearly so, abruptly widen- 

 ing into the calyx. 



Tube of the hypanthium about 4 mm. long; petals 6-7 mm. long. 



32. E. laevicaule. 

 Tube of the hypanthium 7-8 mm. long; petals 10-12 mm. long. 



33. E. Hammondii. 

 Petals yellow ; perennials ; stigma 4-cIeft. 34. E. luteum. 



