586 ONAGRACEAE 



Petals pink-purple. 16. E. delicatum. 



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, stoloniferous. 17. E. alpinum. 

 Petals purple or pink. 



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



18. E. Hornemannii. 

 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 ascending 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. E. 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- 

 elliptic; 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, horny at the apex, the latter very 



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

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

 usually puberulent, at least when young; pedicels slender. 



30. E. paniculatum. 

 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-cleft. 34. E. luteum. 



1. E. ursinum Parish. Perennial, with turions (subterranean bulb-like 

 winter-buds); stem 1-3 dm. high, pilose with long silky hairs; inflorescence 

 minutely glandular; leaves 2-3 cm. long, ovate or broadly lanceolate, serrate or 

 serrulate, rounded at the base, sessile, pilose throughout; petals white or laven- 

 der, about 5 mm. long; capsule 3 cm. long, soon glabrous; seeds 1.5 mm. long, 

 short-beaked, with a white scant coma. Wet meadows: Wash. Ida. s Calif. 

 Son. Je-Jl. 



2. E. Sandbergii Rydb. Perennial by means of turions; stem obtusely 

 angled, 6-10 dm. high, finely puberulent throughout; leaves sessile, ovate, acute, 

 dentate, 3-7 cm. long, pubescent on both sides, or glabrate below, except the 

 veins; inflorescence crisp-hairy; calyx-lobes linear-lanceolate, about 5 mm. long; 

 petals rose, 7-8 mm. long; pod 4-6 cm. long, glandular-pilose; seeds 1.5 mm. 

 long, almost beakless; coma tawny. Moist places: Ida. Mont. Submont. 

 Jl. 



3. E. P aimer i Rydb. Perennials propagating by turions or occasionally 

 by rosettes; stem 4-6 dm. high, glandular-pilose, usually reddish or brownish; 

 leaves sessile or nearly so, ovate or ovate-lanceolate, denticulate, 3-4 cm. long, 



