302 Contributions to Western Botany. [zoe 



EcHiNOCACTUS SiMPSONi Eng. Should be called Mamillaria 

 Simpsoni, as all its relatives are there, and it differs in but one re- 

 spect from that genus, /. e., having the flowers just a little above 

 the base of the tubercle. It blooms in daylight, and closes partly 

 at night. Rather common at high altitudes, i. e., above 7,000 feet. 

 La Sal Mountains, Eastern Utah, and through the Territory and 

 into Nevada. June. 



EcHiNOCACTUS Whipplei Eng. This opens in the forenoon, 

 and closes partly between 5 and 6 P. M. It also opens in the day- 

 time if put in a dark place. It blooms in June, inhabiting the alka- 

 line valleys and gravelly slopes. Occasional in Western Utah and 

 Eastern Nevada. 



OpuntiaJ RUTILA Nutt- This is not distinct from O. Missouriensis. 

 The flowers close partly at night, and in rain probably. Common. 

 It blooms in May and June. 



Cymopterus corrugatus Jones. This is not the type, but is 

 the plant referred by Watson to C. Fe?idleri, and by Coulter and 

 Rose to cornigaius. I could not get it with mature fruit. Involucre 

 none; involucels broadly oval and scarious, or lanceolate and green, 

 acute; fruit broadly winged; flowers white. Clayey hillsides near 

 the Sevier River, Utah, below Juab. June, 1880. I doubt that it 

 belongs to either species. 



Cymoterus Ibapensis n. sp. Flowers white, in a head an inch 

 wide; root large and long, thick and fleshy, erect, usually branched 

 at summit, leafless but densely covered with what appear to be old 

 leaf petioles; from amid these the scape arises and is 2 inches long 

 in flower, its summit bears a tuft of many leaves; scapes in fruit 6 

 inches long or less; peduncles in flower shorter than the leaves, 

 lengthening in fruit to 4 inches; leafless, striate, erect in flower and 

 erect or decumbent in fruit; leaves fleshy and on drying finely 

 wrinkled and so appearing to be finely pubescent, but glabrous, 3 

 inches long, ternate with the divisions pinnate to bipinnate, ultimate 

 segments obtuse, either obovate,and less than a line long or linear- 

 spatulate and 2 lines long; base of petioles of the outer leaves much 

 enlarged, nerved and sheathing, the rest less so; petioles not over 

 an inch long, nerved; umbel of 6 to 8 rays, scarcely perceptible in 

 flower, Yo inch long in fruit and stout; involucre none; involucels 



