OF AKTS AND SCIENCES : MAY 13. 1873. 587 



characters of the capsule, which is 1 - 1 |' long, more attenuated up- 

 wards, membranous-coriaceous and not corky. The seeds as known 

 are imperfectly developed, but show little difference except in the 

 want of the corky testa. As the fruit of CE. brachycarpa is variable in 

 these respects, it is probable that this may be only a form of that 

 species. There may prove to be a distinguishing character, however, in 

 the calyx, — the bud close and obtuse in CE. Wrightii, acuminate and 

 with free, slender tips in CE. brachycarpa. — New Mexico. 



***** Caulescent perennials ; flowers axillary, yellow, except 

 in CE. canescens ; calyx-tube slightly dilated upwards; capsule 

 short-pedicelled or sessile, ovate to orbicular, strongly angled or 

 very broadly winged ; seeds in one row in the cells. — Mega- 

 pterium, Spach. 



24. CE. canescens, Torr. Low, diffuse, £° high ; stems ascending 

 or subdecumbent, leafy to the summit ; pubescence canescent, minute, 

 substrigose, appressed ; leaves numerous, linear to narrowly lanceolate, 

 3 - 6" long, entire or sparingly toothed ; flowers near the ends of the 

 branches ; calyx-tube rather stout, 6 - 8" long, the tips of the segments 

 not free in the bud ; petals broadly obovate, entire, y long, white, spotted 

 and tinged with rose-color; capsule ovate, 3 - 4" long, sessile, acute, prom- 

 inently angled, not strongly ribbed ; seeds oblong, acute, angled, very 

 nearly smooth. — From the upper waters of the Platte to New Mexico. 

 The section Gauropsis was proposed by Dr. Torrey for this species, 

 but the color of the flowers is the only prominent distinction. 



25. CE. Fremontii. Stems low and tufted, 2-6' high, simple, ascend 

 ing ; pubescence canescent, short and silky, dense and appressed ; leaves 

 narrowly lanceolate, 2' long, acuminate, attenuate to a slender petiole, 

 entire or obscurely denticulate ; flowers below the ends of the branches ; 

 calyx-tube slender, 1 - 2' long, the segment-tips free in the bud ; petals 

 emarginate, \-V long ; capsules 8" long by % wide, very broadly 

 winged, rounded and not emarginate at the apex, on pedicels 1" long 

 or less, densely canescently silky ; seeds 4 - 5 in each cell, oblong-ovate, 

 not crested nor tuberculate. — Collected by Fremont on his second ex- 

 pedition (locality not given), by Dr. Bigelow (363) on the Mexican 

 Boundary Survey at Santa Barbara in the Rio Grande Valley, and by 

 Dr. Parry on dry, chalky hillsides near Smoky Hill, Kansas. 



26. CE. Missouriensis, Sims. Stems decumbent or ascending:, 

 simple or somewhat branched, very short or 1° or more long and sub- 



