PIPER FLORA OF THE STATE OF WASHINGTON. 381 



2. Linum lewisii Pursh, Fl. 1: 210. 1814. 

 Linum lyaUanum Alefeld, Bot. Zeit. 25: 251. 1867. 



Type locality: "In the valleys of the Rocky Mountains and on the banks of the Mis- 

 souri." Collected by Lewis. 



Rang6: Washington to Hudson Bay, southward to Texas and California. 



Specimens examined: Klickitat Valley, LyaU in 1860; Ellensburg, Whited 428, 685; 

 Rattlesnake Mountains, Cotton 424; near Leavenworth, Whited, August, 1896; Pasco, 

 HindsfiMW 47; Wenas River, Henderson, June, 1892; Ritzville, Sandberg & Leiberg 198; 

 Parrots, LaJce & Hull, August 5, 1892; Pullman, Pi'per 1648; Hull 760; Elmer 814. 



Zonal distribution: Arid Transition. 



This species was formerly confused with L. perenne L. 



3. Lintim digynum A. Gray, Proc. Am. Acad. 7: 334. 1868. 

 Type locality: "Mariposa Trail, Yosemite Valley," California. 

 Range: Washington to California. 



Specimens examined: Spsmgle, SuJcsdorf'ZHl; Pullman, Piper 1803. 

 Zonal distribution: Arid Transition. 



EUPHORBIACEAE. Euphorbia Family. 



Flowers involucrate; capsule 3-celled Euphorbia. 



Floweiy not involucrate; capsule 1-celled, 1-seeded Piscaria. 



EUPHORBIA. 



Glands of the involucre bearing petal-like appendages; plants prostrate or 

 nearly so. 



"^ Herbage pubescent; seeds black 3. E. maculata. 



Herbage glabrous; seeds gray. 



Seeds with sharp transverse ridges 1. E. glyptosperma. 



Seeds pitted and wrinkled 2. E. serpyllifolia. 



Glands of the involucre not bearing petal-like appendages; stems erect. 



Leaves filiform, very numerous; seeds smooth 5. E. cyparissias. 



Leaves not filiform nor very numerous; seeds not smooth. 



Seeds pitted; leaves entire, oblong or obovate 4. E. peplus. 



Seeds reticulated; leaves serrulate, spatulate 6. E. arJcansana. 



1. Euphorbia glyptosperma Engelm. in Torr. Bot. Mex. Bound. 187. 1859. 

 Euphorbia polygonifolia L. err. det. Ilook. Fl. Bor. Am. 2: 140. 



Type locality: "Canada {Pursh) to Carlton House Fort on the Saskatchewan. Drum- 

 mond. On Menzies Island and at the Grand Rapids of the Columbia. Douglas." 



Range: British Columbia to Canada, south to California, Texas, and Mexico. 



Specimens examined: Columbia Valley, LyaU, June, 1860; White Salmon, Suksdorf 

 489; White Bluff Ferry, Lake cfc HuU 641; Wenache, Whited 197, 1154; North Yakima, 

 Watt, August, 1895; Pcshastin, Sandberg dc Leiberg 472; Lake Chelan. Lake & Hull 642; 

 Almota, Piper 1816; Wawawai, Piper 1893, August, 1894; Meyers Falls, Ereager, August 

 21, 1902; Marcus, Ereager 461. 



Zonal distribution: Upper Sonoran and Arid Transition. 



2. Euphorbia serpyllifolia Pers. Syn. PI. 2: 14. 1807. 

 Type locality: "Hah. in Amer. calidiorc." 

 Range: Washington to Wisconsin, .south to Mexico. 



Specimens examined: Tacoma, Fleit 25; Loomis, Elmer 602; Pullman, Piper 1543; 

 Yolm Prairie, Piper in 1888. 



Zonal distribution: Transition. 



