582 PROCEEDINGS OP THE AMERICAN ACADEMY 



oblong-lanceolate or rhomboidal, 2-4' long, acute or acuminate, atten- 

 uate into a long petiole, repandly denticulate or sinuate-pinnatifid with 

 irregularly unequal segments, or the lowest entire ; calyx very villous, the 

 bud obtuse, the tube slender, £-l£' long, throat naked ; petals about 

 equalling the tube, very broad, entire or deeply sinused ; capsule linear, 

 tapering upward, 1-2' long, 1 - 3" thick at the rigid and often contort- 

 ed base ; seeds lance-linear, smooth, §" long, subangled. — From 

 Western Wyoming to N. Eastern California, and on the eastern side 

 of the Sierra to Arizona and New Mexico. 



10. (E. albicaulis, Nutt. Stems from a perennial subterranean 

 rootstock, erect, £-4° high, simple or branched, white and often shred- 

 dy ; glabrous or puberulent ; leaves linear to oblong-lanceolate, 1-8' 

 long, sessile or attenuate at base or abruptly petioled, entire or repand- 

 denticulate, or sinuate-pinnatifid toward the base ; calyx with the tips 

 of the segments free, the tube rather slender, § - V long, throat naked ; 

 petals equalling or somewhat shorter than the tube, suborbicular, en- 

 tire or emarginate ; capsule and seed as in the last. — A very variable 

 species. From the Saskatchewan to Washington Territory, and east- 

 ward of the Sierra to Sonpra and New Mexico. 



Var. runcinata, Engelm. Canescently puberulent, erect, diffusely 

 branched ; leaves narrowly lanceolate, coarsely dentate or sinuately pin- 

 natifid the whole length. — New Mexico. 



Var. Californica. Weak and decumbent, densely hoary-pubes- 

 cent with short, appressed, strigose hairs, and more or less villous ; 

 leaves lanceolate, repand-denticulate or sinuate-pinnatifid ; flowers 

 large, 2 - 3' in diameter. — California ; not collected in fruit, and per- 

 haps distinct. 



Var. brevifolia, Engelm. Very glabrous, erect, much branched ; 

 leaves broadly ovate, sessile, coarsely dentate, acutish or obtuse, 4 - 6" 

 long, dark green. — Collected only by Wislizenus (99) on sand-hills, 

 south of El Paso in New Mexico. 



Var. trichocalyx, Engelm. Canescently hirsute, erect, sparingly 

 branched ; leaves lanceolate or lance-oblong, sessile, with a broad, trun- 

 cate base, sinuate-dentate. — Also collected only by Wislizenus (473) 

 at Las Vegas in New Mexico. 



11. CE. coronofifolia, Torr. & Gray. Stems from a perennial 

 subterranean rootstock, erect, J- - 1£° high, branched ; canescently pu- 

 berulent, often more or less hispid ; leaves narrowly oblanceolate, 1-2' 

 long, sinuately pinnatifid or more usually pectinate-pinnatifid, the linear 



