104 ONAGRACEJ3. (EVENING-PRIMROSE FAMILY.) 



5. CE. albicaulis, Nutt. Perennial: stems white and shreddy: calyx-tips 

 free, throat naked : seeds smooth, lance-linear. — A very variable species. From 

 New Mexico and Colorado to Washington and British America. 



6. CE. COronopifolia, Torr. & Gray. Perennial : calyx-tips short, free, 

 throat very villous: capsule oblong : seeds orate, angled, tuberculate. — Fl. i. 495. 

 From Nebraska to the Uintas, and southward to New Mexico. 



* * * Acaulescent, or nearly so : Jlowers erect in the bud, white or rose-color: 



capsules mostly sessile, ovate or ovate-oblong, obtusely or sharply angled, large 

 and rigid. 



7. CE. coespitosa, Nutt. Capsule oblong, ribbed, often doubly crested on 

 the angles : calyx-tube 2 to 7 inches long : petals £ to If inches long. — 

 (E. marginata, Nutt. From the Upper Missouri to Nebraska and southward 

 to Nevada, New Mexico, etc. 



8. CE. triloba, Nutt. Capsule ovate, persistent, strongly winged, net-veined : 

 calyx-tips free, the tube 2 to 4 inches long : petals £ to 1 inch long. — From 

 British Columbia to Mexico, and westward to California. 



Var. (?) parviflora, Watson. Flowers very small, about an inch or two 

 long, fertilized in the bud and rarely fully opening : fruit abundant, forming 

 at length a densely crowded hemispherical or cylindrical mass, nearly 2 inches 

 in diameter and often 2 or 3 inches high. — Proc. Am. Acad. xii. 251. Plains 

 of Kansas and Nebraska. 



9. CE. brachyearpa, Gray. Capsule ovate, winged, more or less corky, 

 smooth: calyx-tube 2 to 4 inches long: petcds \\ inch long, purplish: seed-testa 

 thickened. — PL Wright, i. 70. ? CE. marginata, var. purpurea, of the various 

 reports. From Montana to Nevada, New Mexico, and W. Texas. 



* * * * Caulescent : flowers axillary: capsule ovate to orbicular, strongly angled 



and broadly winged. 



10. CE. canescens, Torr. Low: capsule ovate, 3 to 4 lines long: petals 

 white and rose-color, 6 lines long : calyx-tube & to 8 lines long. — From the head- 

 waters of the Platte to New Mexico. 



11. CE. Missouriensis, Sims. Capsule 1 to 3 inches long, with wings 

 nearly as broad: calyx-tube 2 to 5 inches long: petals 1 to 1\ inches long, yellow: 

 seeds strongly crested. — From Missouri to Colorado and Texas. 



§ 2. Stigma capitate : calyx-tube linear, persistent : Jlowers erect in the bud, 

 yellow: anthers oblong: capsules sessile, linear to ovate: seeds in two rows: 

 mostly acaulescent. 



12. CE. breviflora, Torr. & Gray. Subpubescent : leaves deeply pinna- 

 tifid : calyx-tube 3 to 6 lines long : petals 3 lines long. — Wyoming, Colorado, 

 Utah, and westward. 



§ 3. Stigma discoid: calyx-tube more broadly dilated above: Jlowers erect in the 

 bud, yellow, axillary: anthers oblong-linear: capsule mostly sessile, linear- 

 cylindric. 



13. CE. Hartwegi, Benth. Low, 3 to 15 inches high : leaves numerous, 

 linear to lanceolate, mostly entire : calyx-tube 1 to 2 inches long, the tips Jree 

 and linear: petals 4 to 12 lines long: capsule 8 to 10 lines long. 



