PIPER FLORA OF THE STATE OF WASHINGTON. o81 



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

 Linum lyallanum Alefeld, Bot. Zeit. 25: 251. 1S(J7. 



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

 souri." Collected by Lewis. 



R.\nge: Washington to Hudson Bay, southward to Texas and California. 



Specimens examined: Klickitat Valley, Li/all in l.SGO; EUensburg, Whited 42S, 68.5; 

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

 Hindshaw 47; Wenas River, Henderson, June, 1892; Ritzville, Sandherg & Leiherg 198; 

 Parrots, Lote & Hull, August 5, 1892; Pullman, P^/v?' 1648; Hull 760; Elmer 814. 



Zonal distribution: Arid Transition. 



This species was formerly confused with L. perenne, L. 



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

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

 Range: Washington to California. 



Specimens examined: Spangle, <S»1-.«Zo// 261; Pullman, P^'/w 1803. 

 Zonal distribution: Arid Transition. 



EUPHORBIACEAE. Euphorbia Family. 



Flowers involucrate; capsule 3-celle(L . . . . . Euphorbia. 



Floweivs not involucrate; capsule l-celled, 1-seeded ' Piscaria. 



EUPHORBIA. 



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

 nearly so. 



Herbage pubescent ; seeds black 3. E. macula fa. 



Herbage glabrous; seeds gray. 



Seeds with sharp transver.se ridges 1. E. glyptosperma. 



Seeds pitted and wrinkled 2. E. serpylli folia. 



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. 1X7. 1859. 

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



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

 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: Columl)ia Valley, Lyall, June, 1860; White Salmon, Sulcsdorf 

 489; White Bluff Ferry, Lake S Hull 041; Wenache, Whited 197, 1154; North Yakima, 

 Watt, August, 1895; Peshastin, Sandherg c& Leiherg 472; Lake Chelan, Lake & Hnll 642; 

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

 21, 1902; Marcus, Kreager 461. 



Zonal distribution: Upper Sonoran and Arid Transition. 



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

 Type locality: "Ilaii. in Amcr. calidiorc." 

 Range: Washington to Wisconsin, south to Mexico. 



Specimens examined: Taconia, Flctt 25; Loomis, Elmer 602; Pullman, Piper 1543; 

 Yelm Prairie, Piper in 1888. 



Zonal distribution: Transition. 



