PIPER FLORA OF THE STATE OF WASHINGTON. 235 



Specimens examined: Wenache, Whited 723, 1157; Similkameen Valley, Lyall in 1860; 

 Lake Chelan, Lake cfc Hull 673; Coulee City, Henderson 2427; Loomis, Elmer 605; Alkali 

 Lake, Sandberg & Leiberg 419; Clarks Springs, Kreager 123; without locality, Coof,er in 

 1853; Spokane, Sandberg; Piper 2811 SuJcsdorf 945; Watson 349; Sandberg, Heller d: Mac- 

 Dougal 903; Wawawai, Piper 1634, 1547; Waitsburg, Horner 433; Marcus, Kreager 463. 



Zonal distribution: Upper Sonoran. 



We have been quite unable to distinguish two species, as did Douglas, based on differences 

 in degree of development of the bracts, and on the erect or spreading position of the calyx 

 teeth. 



6. Eriogonum decumbens Benth. Trans. Linn. Soc. 17: 415. 1837. 

 Eriogonum niveum decumbens Torr. & Gr. Proc. Am. Acad. 8: 174. 1870. 

 Type locality: "Columbia River." Collected by Douglas. 



Range: Washington and Oregon. 



Specimens examined: Klickitat County, Leckenby; Sunnyside, Piper; without locality, 

 Douglas. 



Zonal distribution : Upper Sonoran. 



This plant is perhaps only a subspecies of E. niveum, but its habit is quite distinct. It is 

 confined to sand hills where it forms large decumbent masses often 50 cm. in diameter. 

 The leaves also are broader than in E. niveum. 



7. Eriogonum microthecum Nutt. Journ. Acad. Phila. II. 1: 162. 1847. 



Type locality: "On the sides of hills in Oregon, east of Walla Walla." Collected by 

 Nuttall. 



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



Specimens examined: Ellensburg, Whited 553; Egbert Springs, Sandberg cfc Leiberg, 

 July, 1893; Tampico, Henderson, July 31, 1892; Moses Lake, Sandberg cfc Leiberg, July, 1893; 

 Parker, Mmer 1078; North Yakima, Piper 1879; Henderson, October 5,1892; Watt, August, 

 1895; without locality. Cooper; without locality, Vasey in 1889; Kiona, Cotton 734. 



Zonal distribution: Upper Sonoran. 



We have seen no Washington specimens referable to E. corymbosum Nutt. and believe 

 that such references really apply to E. microthecum. 



8. Eriogonum elatum Dough; Benth. Trans. Linn. Soc. 17: 413. 1837. 

 Type locality: "Columbia River." Collected by Douglas. 



Range: Washington to California and Nevada. 



Specimens examined: Wenache, IFAiW, August, 1896; Ellensburg, E'Zwier 387 ; Whited 

 21^r, Piper, July, 1897; White Bluff Ferry, Lake cfc Hull 677; North Yakima, Watt, August, 

 1895; Steinweg in 1894; Peshastin, Sandberg & Leiberg, August, 1893; Rock Island, Sand- 

 berg cfc Leiberg 424; near Chelan River, Watson 347; Columbia Valley, Lyall in 1860; Tahlk 

 Plain, Cooper; without locality, Vasey in 1889; Umtanum Creek, Cotton 820. 



Zonal distribution: Upper Sonoran. 



9. Eriogonumnudum Dough; Benth. Trans. Linn. Soc. 17: 413. 1837. 

 Type locality: "Plains of the Multnomah," Oregon. Collected by Douglas. 

 Range: Washington to California. 



Specimens examined: North of Mount Adams, Henderson 2429. 

 Zonal distribution: Arid Transition. 



10. Eriogonum strictum Benth. Trans. Linn. Soc. 17: 414. 1837. 



1'ype locality: "Columbia River." Collected by Douglas. The original label gives 

 the locality "Blue Mountains." 



Range: Blue Mountains of Washington and Oregon. 

 Specimens examined: Along Salmon River, //orner 432. 



11. Eriogonum vimineum Dough; Benth. Trans. Linn. Soc. 17: 416. 1837. 

 Type locality: "Columbia River." Collected by Douglas. 



