302 Contributions to Western Botany. [ZoE 
Ecutnocactus Simpsoni Eng. Should be called Mamillaria 
Simpsoni, as all its relatives are there, and it differs in but one re- 
spect from that genus, 7. 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, z. ¢., above 7,000 feet. 
La Sal Mountains, Eastern Utah, and through the Territory and 
into Nevada. June. 
EcHINocACTUS WuIPPLEI 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. 
OPUNTIARUTILA 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 Fendleri, and by Coulter and 
Rose to corrugatus. 1 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, ina 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, 4 inch long in fruit and stout; involucre none; involucels 
