PIPER—FLORA OF THE STATE OF WASHINGTON. 381 
2. Linum lewisii Pursh, Fl. 1: 210. 1814. 
Linum lyallanum Alefeld, Bot. Zeit. 25: 251. 1867. 
Type Locauity: “In the valleys of the Rocky Mountains and on the banks of the Mis- 
souri.”’ Collected by Lewis. 
Rance: Washington to Hudson Bay, southward to Texas and California. 
SPECIMENS EXAMINED: Klickitat Valley, Lyall in 1860; Ellensburg, Whited 428, 685; 
Rattlesnake Mountains, Cotton 424; near Leavenworth, Whited, August, 1896; Pasco, 
Hindshaw 47; Wenas River, Henderson, June, 1892; Ritzville, Sandberg & Leiberg 198; 
Parrots, Lake & Hull, August 5, 1892; Pullman, Piper 1648; Hull 760; Elmer 814. 
ZONAL pistRipuTion: Arid Transition. , 
This species was formerly confused with L. perenne Li. 
3. Linum digynum A. Gray, Proc. Am. Acad. 7: 334. 1868. 
Tyre Ltocaurry: “ Mariposa Trail, Yosemite Valley,” California. 
Rance: Washington to California. 
SPECIMENS EXAMINED: Spangle, Suksdorf 261; Pullman, Piper 1803. 
ZONAL pistriBuTION: Arid Transition. 
EUPHORBIACEAE. [tupnorspiaA FAMILY. 
Flowers involucrate; capsule 3-celled.. 2.2.2.2... -.---.---- +--+ -2------- EUPHORBIA- 
Flowers not involucrate; capsule 1-celled, l-seeded .........-.------------- PISCARIA. 
EUPHORBIA. 
Glands of the involucre bearing petal-like appendages; plants prostrate or 
nearly so. 
Herbage pubescent; seeds black. ........-------------------- 3. EH. maculata. 
Herbage glabrous; seeds gray. 
Seeds with sharp transverse ridges. ........--..---------+-- 1. FE. glyptosperma. 
Seeds pitted and wrinkled..............-.-------------+- 2. EF. serpyllifolia. 
Glands of the involucre not bearing petal-like appendages; stems erect. 
Leaves filiform, very numerous; seeds smooth.......---------- 5. FE. 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. EF. arkansana. 
1. Euphorbia glyptosperma Engelm. in Torr. Bot. Mex. Bound. 187. 1859. 
Euphorbia polygonifolia L. err. det. Hook. Fl. Bor. Am. 2: 140. 
Type Locauity: “Canada (Pursh) to Carlton House Fort on the Saskatchewan. Drum- 
mond. On Menzies Island and at the Grand Rapids of the Columbia. Douglas.” 
Rance: British Columbia to Canada, south to California, Texas, and Mexico. 
SPECIMENS EXAMINED: Columbia Valley, Lyall, June, 1860; White Salmon, Suksdorf ° 
489; White Bluff Ferry, Lake & Hull 641; Wenache, Whited 197, 1154; North Yakima, 
Watt, August, 1895; Peshastin, Sandberg & Leiberg 472; Lake Chelan, Lake & Hull 642; 
Almota, Piper 1816; Wawawai, Piper 1893, August, 1894; Meyers Falls, Kreager, August 
21, 1902; Marcus, Kreager 461. 
ZONAL DISTRIBUTION: Upper Sonoran and Arid Transition. 
2. Euphorbia serpyllifolia Pers. Syn. Pl. 2: 14. 1807. 
Type Locatiry: ‘Hab. in Amer. calidiore.”’ 
Rance: Washington to Wisconsin, south to Mexico. 
SPECIMENS EXAMINED: Tacoma, Flett 25; Loomis, Elmer 602; Pullman, Piper 1543; 
Yelm Prairie, Piper in 1888. 
ZONAL DISTRIBUTION: Transition. 
