174 UNIVERSITY OF MISSOURI STUDIES [322 



ornata Pursh; Touterea decapetala (Pursh) Rydb.]. Ten- 



PETALLED WESTERN STAR. 



Near Boulder (Rydberg). 



Alberta to Montana; Texas to Nevada. 



289. ACROIASIA Presl. Mentzelia. 



711. A. latifolia Rydb. Broad-leaved mentzelia. 



At Boulder the type locality (Daniels). Between Sunshine 

 and Ward (Rydberg). 

 Colorado. 



712. A. albicaulis (Dougl.) Rydb. [Mentzelia albicaulis 

 Dougl.]. White-stemmed mentzelia. 



Common in dry, especially sandy soil, 5100-6500 ft. (Daniels, 

 92). 



Nebraska to British Columbia ; New Mexico and Utah. 



712a. A. albicaulis integrifolia (Wats.) Daniels. Nov. comb. 



[Mentzelia albicaulis integrifolia Wats.; A. integrifolia 



(Wats.) Rydb.; M. dispcrsa Wats.]. Entire-leaved 



mentzelia. 



With the preceding, into which it apparently passes, 5100- 



6500 ft. (Daniels, 88). 



Montana to British Columbia ; Colorado to California. 



Family 75. CACTACEAE H. B. K. Cactus family. 



290. CACTUS L. Ball cactus. 



713. C. viviparus Nutt. [Mamillaria vivipara (Nutt.) Haw.]. 

 Viviparous ball cactus. 



Near Long's Peak (Porter & Coulter). 

 Nebraska and Montana to Colorado. 



291. ECHINOCERETJS Engelm. Prickly cereus. 



714. E. viridiflorus Engelm. [Cereus viridiflorus Engelm.]. 

 Green-flowered prickly cereus. 



Common on the plains, mesas, and foothills, 5100-8000 ft, 

 (Daniels, 818). Not seen in flower. 

 Kansas to Wyoming; Texas to New Mexico. 



