586 PROCEEDINGS OF THE AMERICAN ACADEMY 



upon the back with thin, flattened processes, and with a narrow, lon- 

 gitudinal furrow on the ventral side. — From "the Upper Missouri to 

 Nebraska, Nevada, New Mexico, and Sonora. The typical, wholly gla- 

 brous form appears to be found only on the Upper Missouri in Dako- 

 tah and Nebraska. 



20. CE. primiveris, Gray. Annual or biennial, acaulescent or 

 nearly so, often very small, more or less villous with spreading, substri- 

 gose hairs ; leaves 1 — 4' long, lyrate-pinnatifid or the lower oblanceo- 

 late and entire, narrowed into a petiole ; calyx-tube 1 — 2' long, slender, 

 slightly dilated at the throat ; petals obcordate, 4-9' long ; capsule 

 ovoid-conical, not crested nor angled, ribbed and reticulately veined ; 

 seeds as in the last, but irregularly pitted, or rugose and very minute- 

 ly tuberculate. — Western Texas and New Mexico. 



21. CE. triloba, Nutt. Biennial or perennial, very rarely with a 

 stem 1-2' long, nearly glabrous ; leaves 2 - 10' long, somewhat ciliate, 

 long-petioled, runcinate-pinnatifid or oblanceolate and only sinuately 

 toothed, the segments usually repandly denticulate ; calyx-tube slender, 

 2-4' long, slightly dilated at the throat, the tips of the segments free ; 

 petals broadly obovate, | — 1' long, subentire, 3-nerved ; capsules per- 

 sistent, oval or obovate, § - If long, acutely 4-toothed at the apex, 

 strongly winged at the angles, the sides ribbed and reticulately veined ; 

 seeds 1" long, angled, minutely and densely tuberculate. — From the 

 Saskatchewan to Nevada and California, and southward to Texas, New 

 Mexico, and Sonora. 



22. CE. brachycarpa, Gray, Perennial, acaulescent or nearly 

 so ; pubescence canescent, short, usually dense, subtomentose ; leaves 

 rather thick, ovate to linear-lanceolate, 3 - 8' long, long-petioled, usually 

 lyrately pinnatifid, the lower, or sometimes all, entire or more or less 

 deeply sinuate-toothed ; calyx-tube 2-4' long, thick, somewhat dilated 

 upward ; petals H' long, broadly obcordate or entire, more or less pur- 

 plish from the fir^t ; capsule ovate, 8-12" long, |' broad, subattenuate 

 upwards and subcompressed, rigid and coriaceous or corky, the angles 

 winged, the sides smooth ; seeds in two rows (or sometimes but one) in 

 each cell, \\" long, with a thickened corky testa, strongly angled, crest- 

 ed at the summit, minutely tuberculate, somewhat rugose transversely at 

 the base. — New Mexico. Flowering specimens, belonging either to 

 this species or the next, have been collected in Western Texas and 

 through Nevada to Montana. 



23. CE. Wrightii, Gray. Distinguishable from the last only by the 



