408 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



ConconuUy, Whited 1313; Spokane, Piper 2634; Henderson 2467; Nile, Henderson 2464; 

 Sprague, Lahe cfe Hull, August, 1892. 

 Zonal distribution: Arid Transition. 



2. Gayophytum diffusum Torr. & Gr. Fl. 1: 513. 1840. 



Type locality: "Rocky Mountains and plains of Oregon." Collected l\v Xuttall. 



Range: Washington and Idaho to California and Colorado. 



Specimens examined: Wenache, Winted; along Methow River, Whited 220: Loomis- 

 ton, Elmer 609; Lake Chelan, Lake cfc Hull, August, 1892; Klickitat River, Flett 1405; 

 Columbia River, latitude 46° to 49°, Lyall in 1860; without locality, Geyer 546. 



Zonal distribution: Arid Transition. 



3. Gayophytum ramosissimum Torr. & Gr. Fl. 1 : 513. 1840. 

 Type locality: Rocky Mountains. Collected by Nuttall. 

 Range: Washington and Montana to California and Arizona. 



Specimens examined: Mount Adams, Sulcsdorf2Z\Q, 2297, 2296, 2295, 22; Henderson, 

 August, 1892; Mount Rainier, Piper, August, 1895; Falcon Valley, SuTcsdorf 2257 , 20, 21; 

 North Yakima, Piper, June, 1897; Henderson, May, 1892; Wenache, Whited in 1896; 

 W'ashtucna, Elmer 1042; Peshastin, Sandberg d" Leiberg 528; Cascade Mountains, Piper, 

 July, 1895; Nason City, Sandberg cfc Leiberg, July, 1893; without locality, Brandegee 781; 

 Ritzville, Sandberg cfc Leiberg 159; without locality, Vasey in 1889; Blue Mountains, 

 Horner 293, 292; Walla Walla, Nuttall. 



Zonal distribution: Arid Transition. 



Hooker a recognizes two subspecies, l)ut evidently his names have become interchanged 

 in respect to the characters. 



Capsules short, the fruiting pedicels refracted G. ramosissimum strictipes. 



Capsules longer, canescent, pedicels erect in fruit G. ramosissin^um deiJexum. 



4. Gayophytum pumilum S. Wats. Proc. Am. Acad. 18: 193. 1883. 



Type locality; "From San Bernardino County, California, to Washington Territory." 



Range: Washington to California. 



Specimens examined: Mount Adams, Suksdorf 376; Falcon Valley, Suksdorf, June, 

 1881, and 19; Klickitat River, Suksdorf 82; bars of Touchet River, i?orner 286; near 

 Salmon River, Horner 284; Blue Mountains, Horner 317, 119; Skamania County, Flett 

 1236. 



Zonal distribution: Canadian? 



Gayophytum racemosum Torr. & Gr., and Gayophytum caesium Torr. & Gr. Both 

 these names, which are considered to represent one species, appear in Suksdorfs list. The 

 type of the latter was collected in " Oregon, on dry open plains near Walla Walla," by Nut- 

 tall, po.ssibly a Washington locality, but many of Nuttall's plants so labelled were collected 

 far to the southeast of Wallula (Old Fort Walla Walla). At any rate we have seen no Wash- 

 ington specimens of the plant, those lalielled G. racemosum being as a rule G. ramosissimum. 



PACHYLOPHUS. 



Leaves green, glabrous, except the villous margins \. P. marginatus. 



Leaves canescent-puberulent on both sides 2. P. canescens. 



1. Pachylophus marginatus (Nutt.) 



Oenothera marginata Nutt.; Torr. & Gr. Fl. 1: 500. 1840. 



Type locality: "Rocky Mountains in Upper California, about lat. 42°,'' probably in 

 Idaho. Collected by Nuttall. 



Speci.mens examined: Steptoe Canyon, McKay. 



Zonal distribution: Upper Sonoran. 



aLond. Journ. Bot. 6: 224. 1847. 



