PIPER FLORA OF THE STATE OF WASHINGTON". 549 



1. Lactuca spicata (Lam.) A. S. Hitchcock, Trans. Acad. St. Louis 5: 506. 1891. 

 Sonchus STpicatus Lam. Encyc. 3: 401. 1789. 



Sonchus leucophaeus Willd. Sp. PI. 3:1520. 1803. 



Mulgedium leucophaeum DC. Prod. 7: 250. 1838. 



Lactuca leucophaea A. Gray, Proc. Am. Acad. 19: 73. 1883. 



Type locality: "Carolina." 



Range: British Columbia to Newfoundland, south to Oregon and Carolina. 



Specimens examined: Cascade Mountains, latitude 49°, Lyall in 1859; Seattle, Piper; 

 Nisqually Valley, Allen 126a; Falcon Valley, Suksdorf 429; Nason Creek, Sandberg <& 

 Leiherg 615; Waitsburg, Horner 11. 



Zonal distribution: Transition. 



2. Lactuca scariola integrata Gren. & Godr. Fl. Fr. 2: 320. 1850. 



Prickly lettuce. 



Type locality: France. 



Specimens examined: Rock Island, Sandberg cfe Leiberg 467; North Yakima, Watt, 

 August, 1895; Pullman, Piper, August 15, 1894; Wawawai, Piper, 1615; Spokane, Kreager 

 580. 



3. Lactuca pulchella (Pursh) DC. Prod. 7: 134. 1838. Blue lettuce. 

 Sonchus pulchellus Pursh, Fl. 2: 502. 1814. \ /' 



Type locality: "On the banks of the Missouri." ,t i .: • 



Range: British Columbia to Sa-skatchewan, south to California and Ne# Mexico. 



Specimens examined: Ellensburg, Whiied 567; North Yakima, ,}^a<<., August, 1895; 

 Beaver Creek, WMted 30; Fort Vancouver, Tolmie; Cascade Mountains to Colville, 

 Lyall in 1860; Cow Creek, L7jall in 1860; Lake Chelan, Lake cfc Hull, 4,ugi|str4, 1892;,Egl?ert 

 Springs, Sandberg cfc Leiberg 422; Coulee City, Lake cfe Hull, August 7, 1892; Wilson Creek, 

 Lake cfc Hull 808; Wawawai, Elmer 895; Box Canyon, Kreager 390; without locality, 

 Vasey 570. 



Zonal distribution: Arid Transition. 



SONCHUS. Sow thistle. 



Heads large, involucre glandular-pubescent 1. S. arvensis. 



Heads medium-sized; involucre glabrous. 



Leaves prickly-toothed ; auricles rounded 2. S. asper. 



Leaves with soft teeth ; auricles acute 3. S. oleraceus. 



1. Sonchus arvensis L. Sp. PI. 2: 793. 17.53. 

 Type locality: European. 



Specimens examined: Whidby Island, Gardner 150; mouth of Naciies River, Piper 

 2666. 



2. Sonchus asper (L.) Hill, Herb. Brit. 1: 47. 1769. 

 Sonchus oleraceus asper L. Sp. PI. 2: 794. 1753. 

 Type locality: European. 



Specimens examined: North Yakima, lFa<<, August, 1895; Tukanon River, LaZrfi, July 2, 

 1892; Pullman, Hull 807. 



3. Sonchus oleraceus L. Sp. PI. 2: 794. 1753. 

 Type locality: European. 



Specimens examined: Seattle, Piper, July 10, 1895. 



