PIPER FLORA OF THE STATE OP WASHINGTON. 549 



1. Lactuca spicata (Lam.) A. S. Hitclicock, Trans. Acad. St. Louis 5: .5U6. 189L 

 Sonchus spicatus Lam. Eiicyo. 3: 401. 1789. 



. Sonchus leucophaeus Willd. Sp. PI. 3:1520. 1S03. 



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



Laditca leucophaea A. Gray, Proc. Am. Acad. 19: 73. 1SS3. 



Type locality: "Carolina." 



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



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

 Nisqually Valley, Allen 126a; Falcon Valley, SuL'^dorf 429; Nason Creek, Sa/ulbenj d; 

 Leiberg CAS; Waitsburg, Horner 11. 



Zonal distribution: Transition. 



2. Lactuca scariola integrata Gren. & Goth-. Fl. Fr. 2: 320. 18.50. 



Prickly lettuce. 



Type locality: France. 



Specimens examined: Rock Island, Samlherg d- Leiherg 4(i7; North Yakima, Watt. 

 August, 1895; Pullman, Piper, August 15, 1894; Wawawai, Piper, 1(')15; 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." 



Range: British Columbia to Saskatchewan, soutii to California and New Mexico. 



Specimens examined: Ellensburg, Whited 567; North Yakima, Watt, August, 1895; 

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

 Lyall in 1860; Cow Creek, Lyall in 1860; Lake Chelan, Lalce tfc Hull, August 4, 1892; Egl)ert 

 Springs, Sarulherg & Leiherg 422; Coulee City, Lake & Hull, August 7, 1892; Wilson Creek, 

 Lake <& Hull 808; Wawawai, Elmer 895; Box Canyon, Kreager 390; witiiout locality, 

 Vasey 570. 



Zonal distribution: Arid Transition. 



SONCHUS. Sow TnisTLE. 



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



Heads medium-sized; involucre glabrous. 



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



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



1. Sonchus arvensis L. Sp. PI. 2: 793. 1753. 

 Type locality: European. 



Specimens examined: Whidby Island, Gardner 150; mouth of Nach(>s River, Piper 

 2666. 



2. Sonchus asper (L.) Hill, Herl). 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, /^(/Zt, Jul\' 2, 

 1892; Pullman, Hull 807. 



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

 Type locality: European. 



Specimens examined: Seattle, Piper, Jul\' 10, 1895. 



