396 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
2. Mentzelia laevicaulis (Dougl.) Torr. & Gr. Fl. 1: 535. 1840. 
Bartonia laevicaulis Dougl.; Hook. Fl. Bor. Am. 1: 221. 1833. 
?Bartonia parviflora Doug). loc. cit. 
Type rocauity: “On the gravelly islands and rocky shores of the Columbia, near the 
‘Great Falls;’ flowering in June and July.’’ Collected by Douglas. 
Rance: Washington to California and Utah. 
SPECIMENS EXAMINED: West Klickitat County, Suksdorf 1679; Wenache, Whited 24; 
North Yakima, Watt, August, 1895; Parker, Cotton 433; Coulee City, Lake & Hull 439; 
Egbert Springs, Sandberg & Leiberg 378; Spokane, Piper, September, 1896, July, 1894; Loon 
Lake, Winston, July 20, 1897; Waitsburg, Horner 312; without locality, Vasey in 1889; 
Almota, Piper, August, 1894; Lake Kalispel, Kreager 329; Prosser, Cotton 808; Moses Lake, 
Cotton 611. 
ZONAL pistripuTion: 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 cocauity: “On arid sandy plains of the river Columbia.” Collected by Douglas. 
Rance: Washington to California, Nebraska, and New Mexico, 
SPECIMENS EXAMINED: Wenache, Whited 1122; North Yakima, Watt, August, 1895; Plett 
1041; Ellensburg, Piper 2682; Simcoe Valley, Lyall in 1860; without locality, Vasey in 1889; 
“Barren grounds of the Columbia,” Douglas; Pasco, Hindshaw 7; Piper 2975; Ritzville, 
Sandberg & Leiberg 160; Clarks Springs, Kreager 115; Moses Lake, Cotton 615. 
ZONAL bistrRipuTION: 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 Locauiry: East Humboldt Mountains, Nevada. 
Range: Washington and Montana to California and Colorado. 
SPECIMENS EXAMINED: Similkameen, Lyall in 1860; Wenache, Whited 1121; Tumwater 
Canyon, Sandberg & 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. 
5. Mentzelia tenerrima Rydberg, Mem. N. Y. Bot. Gard. 1: 271. 1900. 
Type Locairy: “Foot of Electric Peak,’’ Montana. 
Rance: Washington to Montana. 
SPECIMENS EXAMINED: Klickitat River, Flett 1017. 
CACTACEAE. Cacrus Faminy. 
Plants jointed, the segments flat; leaves subulate and deciduous ....---------- OPUNTIA. 
Plants globose or ovoid, tubercled........----.--------------------------- Cactus. 
-OPUNTIA. PRICKLY PEAR. 
Joints tumid, ovate, rarely 5 em. long.............-.....--- 2. O. fragilis. 
Joints compressed, orbicular, or elliptic, 5 to 10 em, long. 
Seeds 5 or 6 mm. broad... ....-.-.---.---------------- 1. O. polyacantha. 
Seeds 4 mm. broad_......--.--.---------------------- la. O. polyacantha borealis. 
1. Opuntia polyacantha Haw. Suppl. Pl. Succ. $2. 1819. 
Cactus feror Nutt. Gen. 1: 296. 1818, not Willd. 1809. 
Opuntia missouriensis DC. Prod. 3: 472. 1828. 
Type Locauity: ‘In arid situations on the plains of the Missouri.” 
Rance: British Columbia to North Dakota, south to Arizona and New Mexico. 
