174 UNIVERSITY OF MISSOURI STUDIES [322 



ornata Pursh; T outer ea decapetala (Pursh) Rydb.]. TEN- 



PETALLED WESTERN STAR. 



Near Boulder (Rydberg). 



ALBERTA to MONTANA; TEXAS to NEVADA. 



289. ACROLASIA 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. 



7i2a. A. albicaulis integrifolia (Wats.) Daniels. Nov. comb. 

 [Mentzelia albicaulis integrifolia Wats. ; A. integrifolia 

 (Wats.) Rydb.; M. dispersa Wats.]. ENTIRE-LEAVED 



MENTZELIA. 



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

 6500 ft. (Daniels, 88). 



MONTANA to BRITISH COLUMBIA ; COLORADO to CALIFORNIA. 



v-;$ Family 75. CACTACEAE H. B. K. Cactus family. 



290. CACTTTS 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. ECHINOCERETTS 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. 



