. (EVENING-PRIMEOSE FAMILY.) 



""2: w 32. L laiifdlilim, 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 : vert/ 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. suflfruticosum, 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. Wahsatch Mountains near Ogden, Utah, and 

 northwestward to Oregon and Washington Territory. 



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



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



i- 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 Kocky Mountains as far south as Colorado. 



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

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

 2-cleft. 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 : flower-buds somewhat nodding : petals purplish or white : pods hoary. 

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

 the continent to New England. 



7. E. COloratum, Muhl. Stem erect, 1 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, ivith 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. 



H- -i Annuals. 



9. E. paniculatum, 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 Territory. 



