102 ONAGRACEiE. (EVENING-PRIMROSE FAMILY.) 



2. E. latifolium, L. Differing from the last in its short ascending occa, 

 sionally branched stem : ovate-lanceolate, somewhat pubescent, rather thick and 

 rigid leaves, veins not apparent : very large axillary and terminal flowers on short 

 pedicels: somewhat erect glabrous style. — Mountains of Colorado to Arctic 

 America. 



* * Flowers small, white: stamens and style erect, the latter much exserted: 

 stigma thick, with 4 spreading lobes: leaves opposite. 



3. E. SUfifrutlCOSUm, Nutt. Stems decumbent, much branched : leaves 

 linear-lanceolate, entire, somewhat canescent : flowers axillary near the ends 

 of the branches : capsule clavate, narrowed at each end, on a very short pedi- 

 cel. — Torr. & Gray, Fl. i. 488. Wasatch Mountains near Ogden, Utah, and 

 northwestward to Oregon and Washington. 



* * * Flowers small: stamens and style erect, the latter included : stigma clavate 



or cylindrical: lower leaves commonly opposite, the upper often alternate. 



■*- Herbaceous perennials. 



4. E. alpinum, L. Low, 2 to 6 inches high, nearly glabrous: stems ascend- 

 ing from a stoloniferous base, simple : leaves elliptical or ovate-oblong, nearly 

 entire, on short petioles: flowers few or solitary, drooping in the bud: petals 

 purple: pods glabrous. — Throughout the northern part of the continent; in 

 the Rocky Mountains as far south as Colorado. 



5. E. affine, Bong. Stem erect, 6 inches to a foot high, simple, glabrous : 

 leaves sessile, partly clasping, irregularly denticulate : flowers sessile : petals 

 2-clef t. — Torr. & Gray, Fl. i. 489. W. Montana and northward. 



6. E. palustre, L., var. lineare, Gray. Erect, 1 to 2 feet high, branched 

 above, minutely hoary pubescent : leaves narrowly lanceolate or linear, nearly en- 

 tire: Jlower-buds somewhat nodding: petals purplish or white: jiods hoary. — 

 E. palustre, var. albiflorum, Lehm. Colorado and northward, thence across 

 the continent to New England. 



7. E. COloratlim, Muhl. Stem erect, I to 3 feet high, glabrous or nearly 

 so: leaves lanceolate to ovate-oblong, denticulate ; the middle ones sometimes 

 decurrent ; the lower slightly petioled : flower-buds erect : petals purplish, 

 emarginate or 2-cleft : pods minutely pubescent. — Includes E. tetragonum of 

 the Western reports. From Colorado northward, and eastward throughout 

 the N. United States. 



8. E. origanifolium, Lam. Stem generally simple, terete, 6 to 12 inches 

 high, with two pubescent lines : leaves more or less petioled ; the lower rounded, 

 the middle ones oval and equally pointed at each end, the upper acuminate : flow- 

 ers large, varying from dark purple to pure white : capsules sometimes nod- 

 ding. — In the Sierras from California northward, and extending into the 

 Bitter Root Mountains. 



•t- h- Annuals. 



9. E. panieulatum, Nutt. Glabrous or pubescent above : stem erect. 

 10 inches to 10 feet high, dichotomous above: leaves narrowly linear, ob- 

 scurely serrulate, mostly alternate and fascicled; the uppermost subulate: 

 flowers few, terminating the spreading filiform and almost leafless branches: 

 petals obcordate. — Torr. & Gray, Fl. i. 490. From Colorado through Mon- 

 tana and Washington. 



