396 CONTKIBUTIONS FROM THE NATIONAL HERBARIUM. 



2. Mentzelia laevicaulis (Dougl.) Torr. & Gr. Fl. 1 : 535. 1840. 

 Bartonia laevicaulis Dougl.; Hook. Fl. Bor. Am. 1 : 221. 1833. 

 fBartonia pannjlora Dougl. loc. cit. 



Type locality: "On the gravelly islands and rocky shores of the Columbia, near the 

 'Great Falls;' flowering in June and July." Collected by Douglas. 



Range: Washington to California and Utah. 



Specimens examined: West Klickitat County, Sulsdorf 1679; Wenache, Whited 24; 

 North Yakima, WaU, August, 1895; Parker, Cotton 433; Coulee City, Lake <fc Hull 439; 

 Egbert Springs, Sandberg <fc Leiberg 378; Spokane, Piper, September, 1896, July, 1894; Loon 

 Lake, Winston, July 20, 1897; Waitsburg, Homer 312; without locality, Vasey in 1889; 

 Almota* Piper, August, 1894; Lake Ealispcl, Kreager 329; Prosser, Cotton 808; Moses Lake, 

 Co«on 611. 



Zonal distbibdtion: Arid Transition and Upper Sonoran. 



3. Mentzelia albicaulis Dougl.: Hook. Fl. Bor. Am. 1: 222. 1833. 

 Bartonia albicaulis Dougl.; Hook. Fl. Bor. Am. 1: 222. 1833. 



Type localfty: "On arid sandy plains of the river Columbia." Collected by Douglas. 



Range: Washington to California, Nebraska, and New Mexico. 



Specimens examined: Wenache, Whited 1122; North Yakima, Watt, August, 1895; Flett 

 1041; Ellensburg, Piper 2682; Simcoe Valley, Lyall in 1860; without locality, Vasey in 1889; 

 "Barren grounds of the Columbia," Douglas; Pasco, Ilindshaw 7; Piper 2975; llitzvillo, 

 Sandberg tfc Leiberg 160; Clarks Springs, Krenger 115; Mose^ Lake, Cotton 615. 



Zonal distribution : Arid Transition and Upper Sonoran. 



4. Mentzelia integrifolia (S. Wats.) Rydberg, Mem. N. Y. Bot. Gard. 1: 271. 1901. 

 Mentzelia albicaulis integrifolia S. Wats. Bot. King Explor. 114. 1871. 



Mentzelia dispersa S. Wats. Proc. Am. Acad. 11: 137. 1876. 



Type locality: East Humboldt Mountains, Nevada. 



Range: Washington and Montana to California and Colorado. 



Specimens examined: Similkamcen, Lyall in 1860; Wenache, WMted 1121; Tumwater 

 Canyon, Sandberg cfe Leiberg 519; Ellensburg, Elmer, July, 1897; Piper 2739; Spokane, Piper 

 1846; Leiberg 20; Marshall Junction, Piper 2252; without locality, Vasey in 1889; Wawa- 

 wai. Lake & Hull 586; Wenas, Cotton 84. 



Zonal distribution: Arid Transition and Upper Sonoran. 



6. Mentzelia tenerrima Rydberg, Mem. N. Y. Bot. Gard. 1: 271. 1900. 

 Type locality: "Foot of Electric Peak," Montana. 

 Range: Washington to Montana. 

 Specimens examined: Klickitat River, Flett 1017. 



CACTACEAE. Cactus Family. 



Plants jointed, the segments flat ; leaves subulate and deciduous Opuntia . 



Plants globose or ovoid, tubercied Cactus. 



OPUNTIA. Prickly pear. 



Joints tumid, ovate, rarely 3 cm. long 2. O.fragilis. 



Joints compressed, orbicular, or elliptic, 5 to 10 cm. long. 



Seeds 5 or 6 mm. broad 1.0. polyacantha. 



Seeds 4 mm. broad la. 0. polyacantha borealis. 



1. Opuntia polyacantha Haw. Suppl. Pi. Succ. 82. 1819. 

 Cactus ferox Nutt. Gen. 1: 296. 1818, not Willd. 1809. 

 Opuntia ndssouriensis DC. Prod. 3: 472. 1828. 

 Type locality: "In arid situations on the plains of the Missouri." 

 Range: British Columbia to North Dakota, south to Arizona and New Mexico. 



